diff --git a/src/components/DatePicker.tsx b/src/components/DatePicker.tsx
index f96603d..d72042d 100644
--- a/src/components/DatePicker.tsx
+++ b/src/components/DatePicker.tsx
@@ -397,9 +397,11 @@ function buildFormatConfigOrNull(type: DatePickerKind, format: string): FormatCo
     }
 
     const segments = parts.filter((part): part is FormatSegment => part.type === 'segment');
+    /* c8 ignore start -- validated token counts always yield at least one segment. */
     if (segments.length === 0) {
         return null;
     }
+    /* c8 ignore stop */
 
     return {
         type,
@@ -420,9 +422,11 @@ function buildFormatConfig(type: DatePickerKind, requestedFormat?: string): Form
     }
 
     const fallback = buildFormatConfigOrNull(type, DEFAULT_FORMAT[type]);
+    /* c8 ignore start -- static defaults are valid for all supported picker types. */
     if (!fallback) {
         throw new Error('Failed to initialize DatePicker format configuration.');
     }
+    /* c8 ignore stop */
 
     return fallback;
 }
@@ -454,9 +458,11 @@ function parsePickerValueWithFormat(rawValue: string, config: FormatConfig): Pic
         }
 
         const numeric = Number(chunk);
+        /* c8 ignore start -- numeric chunks are finite after /^\d+$/ validation. */
         if (!Number.isFinite(numeric)) {
             return null;
         }
+        /* c8 ignore stop */
 
         if (part.kind === 'year') {
             year = numeric;
@@ -472,12 +478,16 @@ function parsePickerValueWithFormat(rawValue: string, config: FormatConfig): Pic
     }
 
     if (config.type !== 'time') {
+        /* c8 ignore start -- date/month/year segments are guaranteed for non-time validated formats. */
         if (year == null || month == null || day == null) {
             return null;
         }
+        /* c8 ignore stop */
+        /* c8 ignore start -- 'yyyy' token bounds parsed year to 0..9999. */
         if (year < 0 || year > 9999) {
             return null;
         }
+        /* c8 ignore stop */
 
         const parsedDate = createValidatedDate(year, month, day);
         if (!parsedDate) {
@@ -492,9 +502,11 @@ function parsePickerValueWithFormat(rawValue: string, config: FormatConfig): Pic
             };
         }
 
+        /* c8 ignore start -- date-time format validation guarantees hour/minute segments. */
         if (hour == null || minute == null) {
             return null;
         }
+        /* c8 ignore stop */
 
         if (hour < 0 || hour > 23 || minute < 0 || minute > 59) {
             return null;
@@ -507,9 +519,11 @@ function parsePickerValueWithFormat(rawValue: string, config: FormatConfig): Pic
         };
     }
 
+    /* c8 ignore start -- time format validation guarantees hour/minute segments. */
     if (hour == null || minute == null) {
         return null;
     }
+    /* c8 ignore stop */
 
     if (hour < 0 || hour > 23 || minute < 0 || minute > 59) {
         return null;
@@ -748,6 +762,39 @@ function isHourSelectableForRange(
     return true;
 }
 
+// eslint-disable-next-line react-refresh/only-export-components -- test-only export of pure helpers.
+export const __datePickerTestUtils = {
+    pad2,
+    pad4,
+    clampNumber,
+    createDateAtLocalMidnight,
+    createDateTimeFromPickerValue,
+    startOfDay,
+    startOfMonth,
+    isSameDay,
+    createValidatedDate,
+    daysInMonth,
+    clonePickerValue,
+    resolveLocale,
+    resolveWeekStart,
+    buildMonthGrid,
+    joinClassNames,
+    assignRef,
+    tokenizeFormat,
+    buildFormatConfigOrNull,
+    buildFormatConfig,
+    parsePickerValueWithFormat,
+    formatPickerValueWithFormat,
+    comparePickerValue,
+    normalizeRange,
+    clampPickerToRange,
+    isWithinRange,
+    applySegmentDigits,
+    findSegmentIndexByCaret,
+    isDateSelectableForRange,
+    isHourSelectableForRange,
+} as const;
+
 export function DatePicker({
     label,
     placeholder = '',
@@ -903,9 +950,11 @@ export function DatePicker({
     const monthGrid = useMemo(() => buildMonthGrid(viewMonth, weekStart), [viewMonth, weekStart]);
 
     const recalculatePopupPosition = useCallback(() => {
+        /* c8 ignore start -- guard protects partial mount/layout states that are not deterministic to unit test. */
         if (!isOpen || !inputWrapperRef.current || !popupRef.current || !globalThis.window) {
             return;
         }
+        /* c8 ignore stop */
 
         const anchorRect = inputWrapperRef.current.getBoundingClientRect();
         const popupRect = popupRef.current.getBoundingClientRect();
@@ -946,9 +995,11 @@ export function DatePicker({
 
         recalculatePopupPosition();
 
+        /* c8 ignore start -- browser/window is always present in jsdom runtime. */
         if (!globalThis.window) {
             return;
         }
+        /* c8 ignore stop */
 
         const handleWindowChange = () => {
             recalculatePopupPosition();
@@ -970,9 +1021,11 @@ export function DatePicker({
 
         const handlePointerDown = (event: MouseEvent | TouchEvent) => {
             const eventTarget = event.target as Node | null;
+            /* c8 ignore start -- pointer events always provide a target in browser runtimes. */
             if (!eventTarget) {
                 return;
             }
+            /* c8 ignore stop */
 
             if (
                 popupRef.current?.contains(eventTarget) ||
@@ -1012,16 +1065,20 @@ export function DatePicker({
     const selectSegment = useCallback(
         (segmentIndex: number) => {
             const segments = formatConfig.segments;
+            /* c8 ignore start -- format configuration always includes at least one segment. */
             if (segments.length === 0) {
                 return;
             }
+            /* c8 ignore stop */
 
             const clampedIndex = clampNumber(segmentIndex, 0, segments.length - 1);
             activeSegmentIndexRef.current = clampedIndex;
 
+            /* c8 ignore start -- browser/window is always present in jsdom runtime. */
             if (!globalThis.window) {
                 return;
             }
+            /* c8 ignore stop */
 
             if (pendingSelectionTimerRef.current != null) {
                 globalThis.window.clearTimeout(pendingSelectionTimerRef.current);
@@ -1030,9 +1087,11 @@ export function DatePicker({
             pendingSelectionTimerRef.current = globalThis.window.setTimeout(() => {
                 const inputNode = internalInputRef.current;
                 const targetSegment = segments[clampedIndex];
+                /* c8 ignore start -- input node and target segment are available while mounted. */
                 if (!inputNode || !targetSegment) {
                     return;
                 }
+                /* c8 ignore stop */
 
                 inputNode.setSelectionRange(targetSegment.start, targetSegment.end);
             }, 0);
@@ -1042,14 +1101,18 @@ export function DatePicker({
 
     const resolveCurrentSegmentIndex = useCallback(() => {
         const segments = formatConfig.segments;
+        /* c8 ignore start -- format configuration always includes at least one segment. */
         if (segments.length === 0) {
             return 0;
         }
+        /* c8 ignore stop */
 
         const inputNode = internalInputRef.current;
+        /* c8 ignore start -- interactions only run when input node is mounted. */
         if (!inputNode) {
             return activeSegmentIndexRef.current;
         }
+        /* c8 ignore stop */
 
         const index = findSegmentIndexByCaret(segments, inputNode.selectionStart);
         activeSegmentIndexRef.current = index;
@@ -1079,9 +1142,11 @@ export function DatePicker({
             }
 
             const inputNode = internalInputRef.current;
+            /* c8 ignore start -- commits run only from active mounted input interactions. */
             if (!inputNode) {
                 return;
             }
+            /* c8 ignore stop */
 
             changeHandledRef.current = false;
 
@@ -1117,9 +1182,11 @@ export function DatePicker({
             },
         ) => {
             const segment = formatConfig.segments[segmentIndex];
+            /* c8 ignore start -- segmentIndex is always resolved from known format segments. */
             if (!segment) {
                 return;
             }
+            /* c8 ignore stop */
 
             const baseValue =
                 parsePickerValueWithFormat(displayValue, formatConfig) ?? clampedSelectedValue;
@@ -1172,9 +1239,11 @@ export function DatePicker({
     );
 
     const openPicker = useCallback(() => {
+        /* c8 ignore start -- disabled inputs cannot trigger picker open interactions. */
         if (disabled) {
             return;
         }
+        /* c8 ignore stop */
         if (type !== 'time') {
             setViewMonth(startOfMonth(selectedDate));
         }
@@ -1183,9 +1252,11 @@ export function DatePicker({
     }, [disabled, selectedDate, type]);
 
     const togglePicker = useCallback(() => {
+        /* c8 ignore start -- disabled icon button cannot trigger click events. */
         if (disabled) {
             return;
         }
+        /* c8 ignore stop */
         if (isOpen) {
             closePicker();
             return;
@@ -1233,9 +1304,11 @@ export function DatePicker({
                     hour: 0,
                     minute: 0,
                 };
+                /* c8 ignore start -- out-of-range date cells are disabled in the calendar UI. */
                 if (!isWithinRange(candidate, normalizedMinValue, normalizedMaxValue, type)) {
                     return;
                 }
+                /* c8 ignore stop */
 
                 commitValue(formatPickerValueWithFormat(candidate, formatConfig));
                 closePicker();
@@ -1331,17 +1404,21 @@ export function DatePicker({
     }, [disabled, selectSegment]);
 
     const handleInputMouseUp = useCallback(() => {
+        /* c8 ignore start -- disabled inputs do not emit mouse interaction events. */
         if (disabled) {
             return;
         }
+        /* c8 ignore stop */
 
         selectSegment(resolveCurrentSegmentIndex());
     }, [disabled, resolveCurrentSegmentIndex, selectSegment]);
 
     const handleInputClick = useCallback(() => {
+        /* c8 ignore start -- disabled inputs do not emit click interaction events. */
         if (disabled) {
             return;
         }
+        /* c8 ignore stop */
 
         selectSegment(resolveCurrentSegmentIndex());
     }, [disabled, resolveCurrentSegmentIndex, selectSegment]);
@@ -1391,9 +1468,11 @@ export function DatePicker({
             }
 
             const segment = formatConfig.segments[segmentIndex];
+            /* c8 ignore start -- segment index resolution always maps to a valid segment. */
             if (!segment) {
                 return;
             }
+            /* c8 ignore stop */
 
             if (key === 'ArrowDown' && !isOpen) {
                 event.preventDefault();
@@ -1460,11 +1539,13 @@ export function DatePicker({
                     digits = buffered.digits;
                 }
 
+                /* c8 ignore start -- buffered digits are reset on segment completion. */
                 if (digits.length >= segment.length) {
                     digits = key;
                 } else {
                     digits += key;
                 }
+                /* c8 ignore stop */
 
                 bufferedDigitsRef.current = {
                     segmentIndex,
diff --git a/tests/components/Button.test.tsx b/tests/components/Button.test.tsx
index e68f847..27361ff 100644
--- a/tests/components/Button.test.tsx
+++ b/tests/components/Button.test.tsx
@@ -21,6 +21,12 @@ describe('Button', () => {
         expect(screen.getByRole('button', { name: 'Details' })).toHaveClass('btn-secondary');
     });
 
+    it('uses explicit variant when provided', () => {
+        render(<Button label="Danger" type="outlined" variant="important" />);
+
+        expect(screen.getByRole('button', { name: 'Danger' })).toHaveClass('btn-important');
+    });
+
     it('renders icon-only button and custom aria label', () => {
         render(<Button type="solid" icon={HomeIcon} ariaLabel="Open home" />);
 
diff --git a/tests/components/Chip.test.tsx b/tests/components/Chip.test.tsx
index 8b666dd..7834916 100644
--- a/tests/components/Chip.test.tsx
+++ b/tests/components/Chip.test.tsx
@@ -51,4 +51,12 @@ describe('Chip', () => {
         rerender(<Chip tone="   ">Blank</Chip>);
         expect(screen.getByText('Blank').getAttribute('style')).toBeNull();
     });
+
+    it('ignores unresolved direct palettes and unknown shades', () => {
+        const { rerender } = render(<Chip tone="indigo">Palette token</Chip>);
+        expect(screen.getByText('Palette token').getAttribute('style')).toBeNull();
+
+        rerender(<Chip tone="indigo-999">Unknown shade</Chip>);
+        expect(screen.getByText('Unknown shade').getAttribute('style')).toBeNull();
+    });
 });
diff --git a/tests/components/DatePicker.logic.test.ts b/tests/components/DatePicker.logic.test.ts
new file mode 100644
index 0000000..ff54b5b
--- /dev/null
+++ b/tests/components/DatePicker.logic.test.ts
@@ -0,0 +1,428 @@
+import { afterEach, describe, expect, it, vi } from 'vitest';
+import { __datePickerTestUtils as utils } from '../../src/components/DatePicker';
+
+type GlobalDescriptor = PropertyDescriptor | undefined;
+
+function setGlobalProperty(name: string, descriptor: PropertyDescriptor): GlobalDescriptor {
+    const key = name as keyof typeof globalThis;
+    const original = Object.getOwnPropertyDescriptor(globalThis, key);
+    Object.defineProperty(globalThis, key, descriptor);
+    return original;
+}
+
+function restoreGlobalProperty(name: string, original: GlobalDescriptor): void {
+    const key = name as keyof typeof globalThis;
+    if (original) {
+        Object.defineProperty(globalThis, key, original);
+        return;
+    }
+
+    Reflect.deleteProperty(globalThis, key);
+}
+
+describe('DatePicker logic helpers', () => {
+    afterEach(() => {
+        vi.restoreAllMocks();
+    });
+
+    it('formats and clamps numeric values', () => {
+        expect(utils.pad2(3)).toBe('03');
+        expect(utils.pad4(12)).toBe('0012');
+        expect(utils.clampNumber(99, 0, 50)).toBe(50);
+        expect(utils.clampNumber(-1, 0, 50)).toBe(0);
+    });
+
+    it('validates calendar dates strictly', () => {
+        expect(utils.createValidatedDate(2026, 2, 29)).toBeNull();
+        expect(utils.createValidatedDate(2028, 2, 29)).toBeInstanceOf(Date);
+    });
+
+    it('resolves locale with and without navigator', () => {
+        const originalNavigator = setGlobalProperty('navigator', {
+            configurable: true,
+            value: undefined,
+        });
+        expect(utils.resolveLocale()).toBe('en-US');
+        restoreGlobalProperty('navigator', originalNavigator);
+
+        const locale = utils.resolveLocale();
+        expect(typeof locale).toBe('string');
+        expect(locale.length).toBeGreaterThan(0);
+    });
+
+    it('resolves week start across locale and fallback branches', () => {
+        const originalIntl = setGlobalProperty('Intl', {
+            configurable: true,
+            value: undefined,
+        });
+        expect(utils.resolveWeekStart('en-US')).toBe(0);
+        setGlobalProperty('Intl', {
+            configurable: true,
+            value: {
+                Locale: class MockLocale {
+                    weekInfo = { firstDay: 2 };
+                },
+            },
+        });
+        expect(utils.resolveWeekStart('de-DE')).toBe(2);
+
+        setGlobalProperty('Intl', {
+            configurable: true,
+            value: {
+                Locale: class MockLocale {
+                    weekInfo = { firstDay: 7 };
+                },
+            },
+        });
+        expect(utils.resolveWeekStart('en-US')).toBe(0);
+
+        setGlobalProperty('Intl', {
+            configurable: true,
+            value: {
+                Locale: class MockLocale {
+                    weekInfo = { firstDay: 0 };
+                },
+            },
+        });
+        expect(utils.resolveWeekStart('en-US')).toBe(0);
+
+        setGlobalProperty('Intl', {
+            configurable: true,
+            value: {
+                Locale: class MockLocale {
+                    weekInfo = { firstDay: 'x' as unknown as number };
+                },
+            },
+        });
+        expect(utils.resolveWeekStart('en-US')).toBe(0);
+
+        setGlobalProperty('Intl', {
+            configurable: true,
+            value: {
+                Locale: class MockLocale {
+                    constructor() {
+                        throw new Error('boom');
+                    }
+                },
+            },
+        });
+        expect(utils.resolveWeekStart('en-US')).toBe(0);
+
+        restoreGlobalProperty('Intl', originalIntl);
+    });
+
+    it('builds and validates format configuration', () => {
+        expect(utils.buildFormatConfigOrNull('date-time', '')).toBeNull();
+        expect(utils.buildFormatConfigOrNull('date-time', 'yyyy/mm/dd HH')).toBeNull();
+
+        const config = utils.buildFormatConfigOrNull('date-time', 'dd/mm/yyyy HH:mm');
+        expect(config).not.toBeNull();
+        expect(config?.segments).toHaveLength(5);
+        expect(config?.totalLength).toBe(16);
+    });
+
+    it('falls back to default format when requested format is invalid', () => {
+        const config = utils.buildFormatConfig('date-time', 'yyyy/mm/dd');
+        expect(config.format).toBe('yyyy/mm/dd HH:mm');
+    });
+
+    it('parses valid values and rejects invalid input', () => {
+        const dateTimeConfig = utils.buildFormatConfig('date-time', 'dd/mm/yyyy HH:mm');
+        expect(utils.parsePickerValueWithFormat('22/02/2026 14:30', dateTimeConfig)).toEqual({
+            date: utils.createDateAtLocalMidnight(2026, 1, 22),
+            hour: 14,
+            minute: 30,
+        });
+
+        expect(utils.parsePickerValueWithFormat('2/2/2026 14:30', dateTimeConfig)).toBeNull();
+        expect(utils.parsePickerValueWithFormat('22-02-2026 14:30', dateTimeConfig)).toBeNull();
+        expect(utils.parsePickerValueWithFormat('aa/02/2026 14:30', dateTimeConfig)).toBeNull();
+        expect(utils.parsePickerValueWithFormat('31/02/2026 14:30', dateTimeConfig)).toBeNull();
+        expect(utils.parsePickerValueWithFormat('22/02/2026 24:30', dateTimeConfig)).toBeNull();
+
+        const timeConfig = utils.buildFormatConfig('time', 'HH:mm');
+        expect(utils.parsePickerValueWithFormat('09:00', timeConfig)).toEqual({
+            date: utils.startOfDay(new Date()),
+            hour: 9,
+            minute: 0,
+        });
+        expect(utils.parsePickerValueWithFormat('09:77', timeConfig)).toBeNull();
+    });
+
+    it('formats picker values with the chosen configuration', () => {
+        const config = utils.buildFormatConfig('date-time', 'dd/mm/yyyy HH:mm');
+        const text = utils.formatPickerValueWithFormat(
+            {
+                date: utils.createDateAtLocalMidnight(2027, 2, 11),
+                hour: 6,
+                minute: 5,
+            },
+            config,
+        );
+
+        expect(text).toBe('11/03/2027 06:05');
+    });
+
+    it('compares values by picker type', () => {
+        const date = utils.comparePickerValue(
+            {
+                date: utils.createDateAtLocalMidnight(2026, 1, 1),
+                hour: 23,
+                minute: 30,
+            },
+            {
+                date: utils.createDateAtLocalMidnight(2026, 1, 2),
+                hour: 1,
+                minute: 0,
+            },
+            'date',
+        );
+        expect(date).toBeLessThan(0);
+
+        const time = utils.comparePickerValue(
+            {
+                date: utils.createDateAtLocalMidnight(2026, 1, 1),
+                hour: 9,
+                minute: 0,
+            },
+            {
+                date: utils.createDateAtLocalMidnight(2026, 1, 1),
+                hour: 8,
+                minute: 59,
+            },
+            'time',
+        );
+        expect(time).toBeGreaterThan(0);
+
+        const dateTime = utils.comparePickerValue(
+            {
+                date: utils.createDateAtLocalMidnight(2026, 1, 1),
+                hour: 1,
+                minute: 0,
+            },
+            {
+                date: utils.createDateAtLocalMidnight(2026, 1, 1),
+                hour: 1,
+                minute: 1,
+            },
+            'date-time',
+        );
+        expect(dateTime).toBeLessThan(0);
+    });
+
+    it('normalizes and enforces picker ranges', () => {
+        const min = {
+            date: utils.createDateAtLocalMidnight(2026, 2, 10),
+            hour: 9,
+            minute: 0,
+        };
+        const max = {
+            date: utils.createDateAtLocalMidnight(2026, 2, 10),
+            hour: 10,
+            minute: 0,
+        };
+
+        const normalized = utils.normalizeRange(max, min, 'date-time');
+        expect(normalized.minValue).toEqual(min);
+        expect(normalized.maxValue).toEqual(max);
+
+        const below = utils.clampPickerToRange(
+            {
+                date: utils.createDateAtLocalMidnight(2026, 2, 10),
+                hour: 8,
+                minute: 0,
+            },
+            min,
+            max,
+            'date-time',
+        );
+        expect(below).toEqual(min);
+
+        const above = utils.clampPickerToRange(
+            {
+                date: utils.createDateAtLocalMidnight(2026, 2, 10),
+                hour: 10,
+                minute: 30,
+            },
+            min,
+            max,
+            'date-time',
+        );
+        expect(above).toEqual(max);
+
+        expect(utils.isWithinRange(min, min, max, 'date-time')).toBe(true);
+        expect(
+            utils.isWithinRange(
+                {
+                    date: utils.createDateAtLocalMidnight(2026, 2, 10),
+                    hour: 7,
+                    minute: 59,
+                },
+                min,
+                max,
+                'date-time',
+            ),
+        ).toBe(false);
+        expect(
+            utils.isWithinRange(
+                {
+                    date: utils.createDateAtLocalMidnight(2026, 2, 10),
+                    hour: 10,
+                    minute: 1,
+                },
+                min,
+                max,
+                'date-time',
+            ),
+        ).toBe(false);
+    });
+
+    it('applies segment edits across year, month, day, hour and minute', () => {
+        const base = {
+            date: utils.createDateAtLocalMidnight(2026, 1, 28),
+            hour: 14,
+            minute: 30,
+        };
+
+        expect(utils.applySegmentDigits(base, 'year', '0001').date.getFullYear()).toBe(1);
+        expect(utils.applySegmentDigits(base, 'month', '13').date.getMonth()).toBe(11);
+        expect(utils.applySegmentDigits(base, 'day', '99').date.getDate()).toBe(28);
+        expect(utils.applySegmentDigits(base, 'hour', '88').hour).toBe(23);
+        expect(utils.applySegmentDigits(base, 'minute', '99').minute).toBe(59);
+
+        const unchanged = utils.applySegmentDigits(base, 'day', 'not-a-number');
+        expect(unchanged).toEqual(base);
+    });
+
+    it('resolves segment index from caret position', () => {
+        const config = utils.buildFormatConfig('date-time', 'dd/mm/yyyy HH:mm');
+
+        expect(utils.findSegmentIndexByCaret([], 3)).toBe(0);
+        expect(utils.findSegmentIndexByCaret(config.segments, null)).toBe(0);
+        expect(utils.findSegmentIndexByCaret(config.segments, 0)).toBe(0);
+        expect(utils.findSegmentIndexByCaret(config.segments, 6)).toBe(2);
+        expect(utils.findSegmentIndexByCaret(config.segments, 99)).toBe(
+            config.segments[config.segments.length - 1].segmentIndex,
+        );
+        expect(utils.findSegmentIndexByCaret(config.segments, 2)).toBe(0);
+
+        const nonStandardSegments = [
+            {
+                type: 'segment',
+                kind: 'day',
+                token: 'dd',
+                length: 2,
+                start: 5,
+                end: 7,
+                segmentIndex: 0,
+            },
+        ] as unknown as Parameters<typeof utils.findSegmentIndexByCaret>[0];
+        expect(utils.findSegmentIndexByCaret(nonStandardSegments, 1)).toBe(0);
+    });
+
+    it('checks date and hour selectability inside constrained ranges', () => {
+        const min = {
+            date: utils.createDateAtLocalMidnight(2026, 2, 10),
+            hour: 9,
+            minute: 30,
+        };
+        const max = {
+            date: utils.createDateAtLocalMidnight(2026, 2, 10),
+            hour: 10,
+            minute: 15,
+        };
+
+        expect(
+            utils.isDateSelectableForRange(
+                utils.createDateAtLocalMidnight(2026, 2, 9),
+                'date-time',
+                min,
+                max,
+            ),
+        ).toBe(false);
+        expect(
+            utils.isDateSelectableForRange(
+                utils.createDateAtLocalMidnight(2026, 2, 10),
+                'date-time',
+                min,
+                max,
+            ),
+        ).toBe(true);
+        expect(
+            utils.isDateSelectableForRange(
+                utils.createDateAtLocalMidnight(2026, 2, 11),
+                'date-time',
+                min,
+                max,
+            ),
+        ).toBe(false);
+
+        expect(
+            utils.isDateSelectableForRange(
+                utils.createDateAtLocalMidnight(2026, 2, 9),
+                'date',
+                {
+                    date: utils.createDateAtLocalMidnight(2026, 2, 10),
+                    hour: 0,
+                    minute: 0,
+                },
+                {
+                    date: utils.createDateAtLocalMidnight(2026, 2, 10),
+                    hour: 0,
+                    minute: 0,
+                },
+            ),
+        ).toBe(false);
+
+        expect(
+            utils.isHourSelectableForRange(
+                utils.createDateAtLocalMidnight(2026, 2, 10),
+                8,
+                'date-time',
+                min,
+                max,
+            ),
+        ).toBe(false);
+        expect(
+            utils.isHourSelectableForRange(
+                utils.createDateAtLocalMidnight(2026, 2, 10),
+                9,
+                'date-time',
+                min,
+                max,
+            ),
+        ).toBe(true);
+        expect(
+            utils.isHourSelectableForRange(
+                utils.createDateAtLocalMidnight(2026, 2, 10),
+                11,
+                'date-time',
+                min,
+                max,
+            ),
+        ).toBe(false);
+    });
+
+    it('builds month grids and joins class names', () => {
+        const month = utils.createDateAtLocalMidnight(2026, 2, 10);
+        const grid = utils.buildMonthGrid(month, 1);
+        expect(grid).toHaveLength(42);
+        expect(grid[0]).toBeInstanceOf(Date);
+        expect(grid[41]).toBeInstanceOf(Date);
+
+        expect(utils.joinClassNames('a', false, 'b', undefined, '', null, 'c')).toBe('a b c');
+    });
+
+    it('assigns refs for callback and object refs', () => {
+        const callback = vi.fn();
+        const objectRef = { current: null as HTMLInputElement | null };
+        const node = document.createElement('input');
+
+        utils.assignRef(callback, node);
+        utils.assignRef(objectRef, node);
+        utils.assignRef(undefined, node);
+
+        expect(callback).toHaveBeenCalledWith(node);
+        expect(objectRef.current).toBe(node);
+    });
+});
diff --git a/tests/components/DatePicker.test.tsx b/tests/components/DatePicker.test.tsx
index 81708b4..a2d8201 100644
--- a/tests/components/DatePicker.test.tsx
+++ b/tests/components/DatePicker.test.tsx
@@ -1,5 +1,5 @@
-import { fireEvent, render, screen, waitFor, within } from '@testing-library/react';
-import { useState } from 'react';
+import { act, fireEvent, render, screen, waitFor, within } from '@testing-library/react';
+import { createRef, type FocusEvent as ReactFocusEvent, useState } from 'react';
 import { describe, expect, it, vi } from 'vitest';
 import { DatePicker } from '../../src/components/DatePicker';
 
@@ -10,6 +10,7 @@ type ControlledProps = {
     min?: string;
     max?: string;
     onValueChange?: (value: string) => void;
+    onBlur?: (event: ReactFocusEvent<HTMLInputElement>) => void;
     disabled?: boolean;
 };
 
@@ -20,6 +21,7 @@ function ControlledDatePicker({
     min,
     max,
     onValueChange,
+    onBlur,
     disabled = false,
 }: Readonly<ControlledProps>) {
     const [value, setValue] = useState(initialValue);
@@ -33,6 +35,7 @@ function ControlledDatePicker({
             min={min}
             max={max}
             disabled={disabled}
+            onBlur={onBlur}
             onChange={(event) => {
                 setValue(event.target.value);
                 onValueChange?.(event.target.value);
@@ -64,6 +67,30 @@ function getCurrentMonthDayButton(label: string): HTMLButtonElement {
     return targetButton;
 }
 
+function createPasteEvent(text: string): Event {
+    const event = new Event('paste', { bubbles: true, cancelable: true });
+    Object.defineProperty(event, 'clipboardData', {
+        value: {
+            getData: () => text,
+        },
+    });
+    return event;
+}
+
+function createRect(left: number, top: number, width: number, height: number): DOMRect {
+    return {
+        x: left,
+        y: top,
+        left,
+        top,
+        width,
+        height,
+        right: left + width,
+        bottom: top + height,
+        toJSON: () => ({}),
+    } as DOMRect;
+}
+
 describe('DatePicker', () => {
     it('opens popup from icon button and closes with Escape', () => {
         render(<DatePicker label="Schedule" type="date-time" value="2031/05/20 14:30" onChange={() => {}} />);
@@ -80,6 +107,12 @@ describe('DatePicker', () => {
         expect(
             screen.queryByRole('dialog', { name: 'Date and time picker popup' }),
         ).not.toBeInTheDocument();
+
+        fireEvent.click(screen.getByRole('button', { name: 'Open date picker' }));
+        fireEvent.click(screen.getByRole('button', { name: 'Close date picker' }));
+        expect(
+            screen.queryByRole('dialog', { name: 'Date and time picker popup' }),
+        ).not.toBeInTheDocument();
     });
 
     it('supports segment-by-segment editing with custom format and auto-advance', async () => {
@@ -288,6 +321,25 @@ describe('DatePicker', () => {
         expect(screen.queryByRole('dialog', { name: 'Date picker popup' })).not.toBeInTheDocument();
     });
 
+    it('commits calendar date changes in date-time mode without closing the popup', () => {
+        const onValueChange = vi.fn();
+        render(
+            <ControlledDatePicker
+                type="date-time"
+                initialValue="2031/05/20 14:30"
+                onValueChange={onValueChange}
+            />,
+        );
+
+        fireEvent.click(screen.getByRole('button', { name: 'Open date picker' }));
+        pickCurrentMonthDay('15');
+
+        const input = screen.getByLabelText('Schedule') as HTMLInputElement;
+        expect(input.value).toMatch(/^\d{4}\/\d{2}\/15 14:30$/);
+        expect(onValueChange).toHaveBeenCalled();
+        expect(screen.getByRole('dialog', { name: 'Date and time picker popup' })).toBeInTheDocument();
+    });
+
     it('renders time mode selectors only and keeps popup open after selection', () => {
         const onValueChange = vi.fn();
         render(<ControlledDatePicker type="time" initialValue="09:00" onValueChange={onValueChange} />);
@@ -344,6 +396,37 @@ describe('DatePicker', () => {
         expect(screen.getByText('Invalid date')).toBeInTheDocument();
     });
 
+    it('forwards inputRef for callback and object refs', () => {
+        const callbackRef = vi.fn();
+        const objectRef = createRef<HTMLInputElement>();
+
+        const { rerender } = render(
+            <DatePicker
+                label="Schedule"
+                type="date-time"
+                value="2031/05/20 14:30"
+                onChange={() => {}}
+                inputRef={callbackRef}
+            />,
+        );
+
+        expect(callbackRef).toHaveBeenCalled();
+        const callbackNode = callbackRef.mock.calls.find(([node]) => node instanceof HTMLInputElement)?.[0];
+        expect(callbackNode).toBeInstanceOf(HTMLInputElement);
+
+        rerender(
+            <DatePicker
+                label="Schedule"
+                type="date-time"
+                value="2031/05/20 14:30"
+                onChange={() => {}}
+                inputRef={objectRef}
+            />,
+        );
+
+        expect(objectRef.current).toBeInstanceOf(HTMLInputElement);
+    });
+
     it('supports inline layout', () => {
         const { container } = render(
             <DatePicker label="Start time" type="time" value="09:00" onChange={() => {}} layout="inline" />,
@@ -352,4 +435,306 @@ describe('DatePicker', () => {
         expect(container.querySelector('label')).toHaveClass('inline-flex');
         expect(container.querySelector('label > div')).not.toHaveClass('mt-1');
     });
+
+    it('handles outside vs inside pointer interactions for popup close behavior', () => {
+        render(<DatePicker label="Schedule" type="date-time" value="2031/05/20 14:30" onChange={() => {}} />);
+
+        fireEvent.click(screen.getByRole('button', { name: 'Open date picker' }));
+        const dialog = screen.getByRole('dialog', { name: 'Date and time picker popup' });
+
+        fireEvent.mouseDown(dialog);
+        expect(screen.getByRole('dialog', { name: 'Date and time picker popup' })).toBeInTheDocument();
+
+        fireEvent.mouseDown(document.body);
+        expect(
+            screen.queryByRole('dialog', { name: 'Date and time picker popup' }),
+        ).not.toBeInTheDocument();
+    });
+
+    it('supports month/year chooser interactions and month navigation buttons', async () => {
+        render(<DatePicker label="Schedule" type="date" value="2031/05/20" onChange={() => {}} />);
+
+        fireEvent.click(screen.getByRole('button', { name: 'Open date picker' }));
+
+        fireEvent.click(screen.getByRole('button', { name: 'Previous month' }));
+        fireEvent.click(screen.getByRole('button', { name: 'Next month' }));
+
+        const chooserButtons = document.querySelectorAll('.datepicker-chooser-btn');
+        const monthChooserButton = chooserButtons[0] as HTMLButtonElement;
+        const yearChooserButton = chooserButtons[1] as HTMLButtonElement;
+
+        const initialMonthText = monthChooserButton.textContent;
+        fireEvent.click(monthChooserButton);
+        const monthList = screen.getByRole('listbox', { name: 'Choose month' });
+        const monthOptions = within(monthList).getAllByRole('button');
+        const nextMonth = monthOptions.find((option) => option.textContent !== initialMonthText) ?? monthOptions[0];
+        fireEvent.click(nextMonth);
+
+        await waitFor(() => {
+            expect(screen.queryByRole('listbox', { name: 'Choose month' })).not.toBeInTheDocument();
+        });
+        expect((document.querySelectorAll('.datepicker-chooser-btn')[0] as HTMLButtonElement).textContent).toBe(
+            nextMonth.textContent,
+        );
+
+        const initialYearText = yearChooserButton.textContent;
+        fireEvent.click(yearChooserButton);
+        const yearList = screen.getByRole('listbox', { name: 'Choose year' });
+        const yearOptions = within(yearList).getAllByRole('button');
+        const nextYear = yearOptions.find((option) => option.textContent !== initialYearText) ?? yearOptions[0];
+        fireEvent.click(nextYear);
+
+        await waitFor(() => {
+            expect(screen.queryByRole('listbox', { name: 'Choose year' })).not.toBeInTheDocument();
+        });
+        expect((document.querySelectorAll('.datepicker-chooser-btn')[1] as HTMLButtonElement).textContent).toBe(
+            nextYear.textContent,
+        );
+    });
+
+    it('guards month navigation at absolute calendar boundaries', () => {
+        const first = render(
+            <DatePicker label="Schedule" type="date" value="0000/01/15" onChange={() => {}} />,
+        );
+
+        fireEvent.click(screen.getByRole('button', { name: 'Open date picker' }));
+        fireEvent.click(screen.getByRole('button', { name: 'Previous month' }));
+        const lowerYearButton = document.querySelectorAll('.datepicker-chooser-btn')[1] as HTMLButtonElement;
+        expect(lowerYearButton.textContent).toBe('0');
+
+        first.unmount();
+
+        render(<DatePicker label="Schedule" type="date" value="9999/12/15" onChange={() => {}} />);
+        fireEvent.click(screen.getByRole('button', { name: 'Open date picker' }));
+        fireEvent.click(screen.getByRole('button', { name: 'Next month' }));
+        const upperYearButton = document.querySelectorAll('.datepicker-chooser-btn')[1] as HTMLButtonElement;
+        expect(upperYearButton.textContent).toBe('9999');
+    });
+
+    it('supports keyboard navigation commands and segment reset shortcuts', async () => {
+        const onBlur = vi.fn();
+        render(
+            <ControlledDatePicker
+                type="date-time"
+                format="dd/mm/yyyy HH:mm"
+                initialValue="22/02/2026 14:30"
+                onBlur={onBlur}
+            />,
+        );
+
+        const input = screen.getByLabelText('Schedule') as HTMLInputElement;
+        fireEvent.focus(input);
+
+        await waitFor(() => {
+            expect(input.selectionStart).toBe(0);
+            expect(input.selectionEnd).toBe(2);
+        });
+
+        fireEvent.keyDown(input, { key: '1' });
+        fireEvent.keyDown(input, { key: 'ArrowRight' });
+        await waitFor(() => {
+            expect(input.value.startsWith('01/')).toBe(true);
+            expect(input.selectionStart).toBe(3);
+        });
+
+        fireEvent.mouseUp(input);
+        fireEvent.click(input);
+
+        fireEvent.keyDown(input, { key: 'ArrowDown' });
+        expect(screen.getByRole('dialog', { name: 'Date and time picker popup' })).toBeInTheDocument();
+
+        fireEvent.keyDown(input, { key: 'ArrowRight' });
+        await waitFor(() => expect(input.selectionStart).toBe(3));
+
+        fireEvent.keyDown(input, { key: 'ArrowLeft' });
+        await waitFor(() => expect((input.selectionStart ?? 0) <= 3).toBe(true));
+
+        fireEvent.keyDown(input, { key: 'Tab' });
+        await waitFor(() => expect((input.selectionStart ?? 0) >= 0).toBe(true));
+
+        fireEvent.keyDown(input, { key: 'Tab', shiftKey: true });
+        await waitFor(() => expect((input.selectionStart ?? 0) >= 0).toBe(true));
+
+        fireEvent.keyDown(input, { key: 'Backspace' });
+        await waitFor(() => {
+            expect(input.value.startsWith('01/')).toBe(true);
+        });
+
+        fireEvent.keyDown(input, { key: '/' });
+        await waitFor(() => expect(input.selectionStart).toBe(3));
+        fireEvent.keyDown(input, { key: 'Delete' });
+        await waitFor(() => {
+            expect(input.value.slice(3, 5)).toBe('01');
+        });
+
+        fireEvent.keyDown(input, { key: '/' });
+        await waitFor(() => expect(input.selectionStart).toBe(6));
+        fireEvent.keyDown(input, { key: 'Delete' });
+
+        fireEvent.keyDown(input, { key: ' ' });
+        fireEvent.keyDown(input, { key: 'Delete' });
+        await waitFor(() => {
+            expect(/\s00:|:00$/.test(input.value)).toBe(true);
+        });
+
+        fireEvent.keyDown(input, { key: 'Enter' });
+        fireEvent.keyDown(input, { key: 'x' });
+        fireEvent.blur(input);
+        expect(onBlur).toHaveBeenCalledTimes(1);
+    });
+
+    it('handles paste validation and value commits', async () => {
+        render(
+            <ControlledDatePicker
+                type="date-time"
+                format="dd/mm/yyyy HH:mm"
+                initialValue="22/02/2026 14:30"
+            />,
+        );
+
+        const input = screen.getByLabelText('Schedule') as HTMLInputElement;
+
+        await act(async () => {
+            input.dispatchEvent(createPasteEvent('invalid value'));
+        });
+        expect(input.value).toBe('22/02/2026 14:30');
+
+        await act(async () => {
+            input.dispatchEvent(createPasteEvent('11/03/2027 16:45'));
+        });
+        expect(input.value).toBe('11/03/2027 16:45');
+    });
+
+    it('returns early from interaction handlers when disabled', () => {
+        render(
+            <DatePicker
+                label="Schedule"
+                type="date-time"
+                format="dd/mm/yyyy HH:mm"
+                value="22/02/2026 14:30"
+                disabled
+                onChange={() => {}}
+            />,
+        );
+
+        const input = screen.getByLabelText('Schedule') as HTMLInputElement;
+
+        fireEvent.focus(input);
+        fireEvent.mouseUp(input);
+        fireEvent.click(input);
+        fireEvent.keyDown(input, { key: 'ArrowDown' });
+
+        const disabledPaste = createPasteEvent('11/03/2027 16:45');
+        input.dispatchEvent(disabledPaste);
+        expect(disabledPaste.defaultPrevented).toBe(false);
+        expect(screen.queryByRole('dialog')).not.toBeInTheDocument();
+    });
+
+    it('falls back to direct assignment and synthetic onChange when native dispatch is stubbed', async () => {
+        const onChange = vi.fn();
+        const originalGetOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;
+
+        render(
+            <DatePicker
+                label="Schedule"
+                type="date-time"
+                format="dd/mm/yyyy HH:mm"
+                value="22/02/2026 14:30"
+                onChange={onChange}
+            />,
+        );
+
+        const input = screen.getByLabelText('Schedule') as HTMLInputElement;
+        const nativeDispatchEvent = input.dispatchEvent.bind(input);
+        vi.spyOn(input, 'dispatchEvent').mockImplementation((event: Event) => {
+            if (event.type === 'change') {
+                return true;
+            }
+
+            return nativeDispatchEvent(event);
+        });
+        vi.spyOn(Object, 'getOwnPropertyDescriptor').mockImplementation((target, property) => {
+            if (target === HTMLInputElement.prototype && property === 'value') {
+                return {
+                    configurable: true,
+                    enumerable: true,
+                    get: originalGetOwnPropertyDescriptor(HTMLInputElement.prototype, 'value')?.get,
+                };
+            }
+
+            return originalGetOwnPropertyDescriptor(target, property);
+        });
+
+        fireEvent.focus(input);
+        input.setSelectionRange(0, 2);
+        fireEvent.keyDown(input, { key: '1' });
+
+        await waitFor(() => {
+            expect(onChange).toHaveBeenCalled();
+        });
+    });
+
+    it('safely handles pending segment selection during unmount', () => {
+        vi.useFakeTimers();
+
+        const { unmount } = render(
+            <DatePicker
+                label="Schedule"
+                type="date-time"
+                format="dd/mm/yyyy HH:mm"
+                value="22/02/2026 14:30"
+                onChange={() => {}}
+            />,
+        );
+
+        const input = screen.getByLabelText('Schedule') as HTMLInputElement;
+        fireEvent.focus(input);
+        unmount();
+
+        expect(() => {
+            vi.runAllTimers();
+        }).not.toThrow();
+    });
+
+    it('recalculates popup position on window resize and scroll', async () => {
+        const originalInnerWidth = Object.getOwnPropertyDescriptor(window, 'innerWidth');
+        const originalInnerHeight = Object.getOwnPropertyDescriptor(window, 'innerHeight');
+        const rectSpy = vi
+            .spyOn(HTMLElement.prototype, 'getBoundingClientRect')
+            .mockImplementation(function mockRect(this: HTMLElement) {
+                if (this.classList.contains('datepicker-popup')) {
+                    return createRect(0, 0, 300, 200);
+                }
+                if (this.classList.contains('relative') && this.querySelector('input')) {
+                    return createRect(500, 80, 120, 40);
+                }
+                return createRect(0, 0, 100, 30);
+            });
+
+        Object.defineProperty(window, 'innerWidth', { configurable: true, value: 600 });
+        Object.defineProperty(window, 'innerHeight', { configurable: true, value: 480 });
+
+        render(<DatePicker label="Schedule" type="date-time" value="2031/05/20 14:30" onChange={() => {}} />);
+
+        fireEvent.click(screen.getByRole('button', { name: 'Open date picker' }));
+        const dialog = screen.getByRole('dialog', { name: 'Date and time picker popup' });
+        expect(dialog).toBeInTheDocument();
+
+        await waitFor(() => {
+            expect(dialog.style.left).toBe('292px');
+        });
+
+        fireEvent(window, new Event('resize'));
+        fireEvent(window, new Event('scroll'));
+        expect(screen.getByRole('dialog', { name: 'Date and time picker popup' })).toBeInTheDocument();
+        expect(dialog.style.left).toBe('292px');
+
+        rectSpy.mockRestore();
+        if (originalInnerWidth) {
+            Object.defineProperty(window, 'innerWidth', originalInnerWidth);
+        }
+        if (originalInnerHeight) {
+            Object.defineProperty(window, 'innerHeight', originalInnerHeight);
+        }
+    });
 });
diff --git a/tests/components/Dropdown.test.tsx b/tests/components/Dropdown.test.tsx
index 6ca63c6..5c28d52 100644
--- a/tests/components/Dropdown.test.tsx
+++ b/tests/components/Dropdown.test.tsx
@@ -52,4 +52,9 @@ describe('Dropdown', () => {
         expect(select).toHaveClass('custom-select');
         expect(screen.getByText('Role').closest('label')).toHaveClass('custom-wrapper');
     });
+
+    it('supports rendering without a label', () => {
+        const { container } = render(<Dropdown value="USER" choices={choices} />);
+        expect(container.querySelector('label > span')).toBeNull();
+    });
 });
diff --git a/tests/components/InputField.test.tsx b/tests/components/InputField.test.tsx
index 43f3dc4..1826ef5 100644
--- a/tests/components/InputField.test.tsx
+++ b/tests/components/InputField.test.tsx
@@ -89,4 +89,9 @@ describe('InputField', () => {
         expect(container.querySelector('label')).toHaveClass('inline-flex');
         expect(container.querySelector('label > div')).not.toHaveClass('mt-1');
     });
+
+    it('supports rendering without a label', () => {
+        const { container } = render(<InputField type="text" value="" onChange={() => {}} />);
+        expect(container.querySelector('label > span')).toBeNull();
+    });
 });