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node_modules/react-day-picker/src/contexts/Modifiers/utils/isDateInRange.test.ts

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+import { addDays } from 'date-fns';
+import { DateRange } from 'index';
+
+import { isDateInRange } from './isDateInRange';
+
+const date = new Date();
+
+describe('when range is missing the "from" date', () => {
+  const range: DateRange = { from: undefined };
+  const result = isDateInRange(date, range);
+  test('should return false', () => {
+    expect(result).toBe(false);
+  });
+});
+
+describe('when range is missing the "to" date', () => {
+  const result = isDateInRange(date, { from: date, to: undefined });
+  test('should return true', () => {
+    expect(result).toBe(true);
+  });
+});
+
+describe('when the range dates are the same as date', () => {
+  const range: DateRange = { from: date, to: date };
+  const result = isDateInRange(date, range);
+  test('should return true', () => {
+    expect(result).toBe(true);
+  });
+});
+
+describe('when the range dates are the same but not as date', () => {
+  const range: DateRange = { from: date, to: date };
+  const result = isDateInRange(addDays(date, 1), range);
+  test('should return false', () => {
+    expect(result).toBe(false);
+  });
+});
+
+describe('when the range is inverted', () => {
+  const range: DateRange = { from: addDays(date, 1), to: date };
+  const result = isDateInRange(date, range);
+  test('should return true', () => {
+    expect(result).toBe(true);
+  });
+});