test: cover early return cases

Author: laug

src/test/datepicker_test.test.tsx

@@ -3231,6 +3231,7 @@ describe("DatePicker", () => {
           startDate={undefined}
           endDate={undefined}
           onChange={onChangeSpy}
+          excludeDates={[newDate("2024-01-01")]}
           ref={(node) => {
             instance = node;
           }}
@@ -3245,7 +3246,21 @@ describe("DatePicker", () => {
         },
       });
 
-      expect(onChangeSpy).toHaveBeenCalled();
+      // cover `if (startDateNew && isDayDisabled(startDateNew, this.props))` block
+      fireEvent.change(input, {
+        target: {
+          value: "01/01/2024-05/06/2024",
+        },
+      });
+
+      // cover `if (endDateNew && isDayDisabled(endDateNew, this.props))` block
+      fireEvent.change(input, {
+        target: {
+          value: "03/04/2023-01/01/2024",
+        },
+      });
+
+      expect(onChangeSpy).toHaveBeenCalledTimes(1);
       expect(Array.isArray(onChangeSpy.mock.calls[0][0])).toBe(true);
       expect(onChangeSpy.mock.calls[0][0][0]).toBeTruthy();
       expect(onChangeSpy.mock.calls[0][0][1]).toBeTruthy();
@@ -3256,6 +3271,34 @@ describe("DatePicker", () => {
         "05/06/2024",
       );
     });
+
+    it("should not fire onChange a second time if user edits text box without the parsing result changing", () => {
+      const onChangeSpy = jest.fn();
+      let instance: DatePicker | null = null;
+      const { container } = render(
+        <DatePicker
+          selectsRange
+          startDate={newDate("2024-03-04")}
+          endDate={newDate("2024-05-06")}
+          onChange={onChangeSpy}
+          ref={(node) => {
+            instance = node;
+          }}
+        />,
+      );
+
+      expect(instance).toBeTruthy();
+      const input = safeQuerySelector<HTMLInputElement>(container, "input");
+
+      // cover `if (!startChanged && !endChanged)` block
+      fireEvent.change(input, {
+        target: {
+          value: "03/04/2024-05/06/2024",
+        },
+      });
+
+      expect(onChangeSpy).not.toHaveBeenCalled();
+    });
   });
 
   describe("duplicate dates when multiple months", () => {