fix: fix string2Date function and add some tests

src/components/helpers.test.ts

@@ -1,7 +1,12 @@
-import { capitalise, toSnakeCase } from "./helpers";
+import { capitalise, string2Date, toSnakeCase } from "./helpers";
 import { describe, expect, test } from "vitest";
 
 const capitaliseFixture = [
+  ["", ""],
+  ["a", "A"],
+  [" ", ""],
+  ["A ", "A"],
+  ["first name ", "FirstName"],
   ["firstName", "FirstName"],
   ["lastName", "LastName"],
   ["first name", "FirstName"],
@@ -24,3 +29,21 @@ describe.each(snakeCaseFixture)("given %s", (inputValue, expValue) => {
     expect(toSnakeCase(inputValue)).toBe(expValue);
   });
 });
+
+const string2DateFixture: Array<[string | null | undefined, Date | null]> = [
+  ["", null],
+  ["a", null],
+  ["2011-02-04", new Date("2011-02-04")],
+  [null, null],
+  [undefined, null],
+];
+
+describe.each(string2DateFixture)("given %s", (inputValue, expValue) => {
+  test(`string2Date returns ${expValue}`, () => {
+    if (expValue === null) {
+      expect(string2Date(inputValue)).toBeNull();
+    } else {
+      expect(string2Date(inputValue)).toEqual(expValue);
+    }
+  });
+});

src/components/helpers.ts

@@ -7,15 +7,21 @@ const capitalise = (text: string) => {
   if (processedText.length == 0) return "";
   if (processedText.length == 1) return text[0]?.toUpperCase();
 
-  processedText = toSnakeCase(text);
+  processedText = toSnakeCase(processedText);
   const snakeToCamel = (s: string) =>
     s.replace(/(_\w)/g, (k) => k[1]!.toUpperCase());
   processedText = snakeToCamel(processedText);
   return processedText[0]!.toUpperCase() + processedText.slice(1);
 };
 
-const string2Date = (text?: string) => {
-  return text ? new Date(text) : null;
+const string2Date = (text?: string | null) => {
+  if (text) {
+    let parsedDate = new Date(text);
+    if (!isNaN(parsedDate.getDate())) {
+      return parsedDate;
+    }
+  }
+  return null;
 };
 
 export { capitalise, toSnakeCase, string2Date };