tests: Fix side-effecty+inconsistent formatting of date value inputs

…making sure input values are applied in a more consistent manner,
and with formatting that matches the currently active dateFormat
(usually the default format).

This only affects clarity/readability. All tests still pass.

Author: maranomynet

src/test/date_utils_test.test.ts

@@ -998,7 +998,7 @@ describe("date_utils", () => {
     });
 
     it("should parse date without strict parsing", () => {
-      const value = "01/15/20";
+      const value = "1/2/2020";
       const dateFormat = "MM/dd/yyyy";
 
       expect(parseDate(value, dateFormat, undefined, false)).not.toBeNull();

src/test/datepicker_test.test.tsx

@@ -912,7 +912,7 @@ describe("DatePicker", () => {
     const input = container.querySelector("input");
     fireEvent.change(input ?? new HTMLInputElement(), {
       target: {
-        value: newDate("2014-01-02"),
+        value: "01/02/2014",
       },
     });
 
@@ -1679,7 +1679,7 @@ describe("DatePicker", () => {
       return render(
         <DatePicker
           selected={new Date("1993-07-02")}
-          minDate={new Date("1800/01/01")}
+          minDate={new Date("1800-01-01")}
           open
         />,
       );
@@ -1691,11 +1691,11 @@ describe("DatePicker", () => {
 
       fireEvent.change(input ?? new HTMLElement(), {
         target: {
-          value: "1801/01/01",
+          value: "01/01/1801",
         },
       });
 
-      expect(container.querySelector("input")?.value).toBe("1801/01/01");
+      expect(container.querySelector("input")?.value).toBe("01/01/1801");
       expect(
         container.querySelector(".react-datepicker__current-month")?.innerHTML,
       ).toBe("January 1801");
@@ -1779,7 +1779,7 @@ describe("DatePicker", () => {
     it("should update the selected date on manual input", () => {
       const data = getOnInputKeyDownStuff();
       fireEvent.change(data.dateInput, {
-        target: { value: "02/02/2017" },
+        target: { value: "2017-02-02" },
       });
       fireEvent.keyDown(data.dateInput, getKey(KeyType.Enter));
       data.copyM = newDate("2017-02-02");