build: add jest, tests

tests/capitalizeFirstChar.test.ts

@@ -0,0 +1,6 @@
+import { capitalizeFirstChar } from "../src";
+import { expect, test } from "@jest/globals";
+
+test("capitalizes first character of the string", () => {
+  expect(capitalizeFirstChar("lorem ipsum")).toBe("Lorem ipsum");
+});

tests/classNames.test.ts

@@ -0,0 +1,10 @@
+import { expect, test } from "@jest/globals";
+import { classNames } from "../src";
+
+test("joins html class strings", () => {
+  let isVisible = false;
+
+  expect(classNames("bg-blue-300", isVisible ? "block" : "hidden")).toBe(
+    "bg-blue-300 hidden",
+  );
+});

tests/conditionalJoin.test.ts

@@ -0,0 +1,10 @@
+import { expect, test } from "@jest/globals";
+import { conditionalJoin } from "../src";
+
+test("conditionally joins strings", () => {
+  let isAdmin = true;
+
+  expect(
+    conditionalJoin(["Hello,", isAdmin ? "Administrator!" : "User!"], " "),
+  ).toBe("Hello, Administrator!");
+});

tests/isDeepWeakEqual.test.ts

@@ -0,0 +1,15 @@
+import { isDeepWeakEqual } from "../src";
+import { expect, test } from "@jest/globals";
+
+test("weakly compares objects", () => {
+  expect(isDeepWeakEqual({ a: 1 }, ["lorem"])).toBe(false);
+
+  expect(isDeepWeakEqual({ a: 1 }, { a: 1 })).toBe(true);
+
+  expect(
+    isDeepWeakEqual(
+      { date: "2024-03-12T18:19:50.548Z" },
+      { date: new Date(1710267590548) },
+    ),
+  ).toBe(true);
+});

tests/randomInRange.test.ts

@@ -0,0 +1,7 @@
+import { expect, test } from "@jest/globals";
+import { randomInRange } from "../src";
+
+test("generates a random number in range", () => {
+  const randomNumber = randomInRange(1, 100);
+  expect(randomNumber >= 1 && randomNumber <= 100).toBeTruthy();
+});

tests/removeFromArrayByKeyValue.test.ts

@@ -0,0 +1,29 @@
+import { expect, test } from "@jest/globals";
+import { removeFromArrayByKeyValue } from "../src";
+
+test("removes an object from an array by key-value object", () => {
+  expect(
+    removeFromArrayByKeyValue(
+      [
+        { a: "1", b: "0" },
+        { a: "2", b: "0" },
+        { a: "3", b: "0" },
+      ],
+      { a: "3" },
+    ),
+  ).toMatchObject([
+    { a: "1", b: "0" },
+    { a: "2", b: "0" },
+  ]);
+
+  expect(
+    removeFromArrayByKeyValue(
+      [
+        { a: "1", b: "0" },
+        { a: "2", b: "0" },
+        { a: "3", b: "0" },
+      ],
+      { b: "0" },
+    ),
+  ).toMatchObject([]);
+});

tests/removeObjectProperty.test.ts

@@ -0,0 +1,9 @@
+import { expect, test } from "@jest/globals";
+import { removeObjectProperty } from "../src";
+
+test("remove object property by provided key", () => {
+  expect(removeObjectProperty({ a: "1", b: "2", c: "3" }, "c")).toMatchObject({
+    a: "1",
+    b: "2",
+  });
+});

tests/replaceFromArrayByKeyValue.test.ts

@@ -0,0 +1,36 @@
+import { expect, test } from "@jest/globals";
+import { replaceFromArrayByKeyValue } from "../src";
+
+test("replace from an array by key-value", () => {
+  expect(
+    replaceFromArrayByKeyValue(
+      [
+        { a: "1", b: "0" },
+        { a: "2", b: "0" },
+        { a: "3", b: "0" },
+      ],
+      { a: "3" },
+      { b: "lorem" },
+    ),
+  ).toMatchObject([
+    { a: "1", b: "0" },
+    { a: "2", b: "0" },
+    { a: "3", b: "lorem" },
+  ]);
+
+  expect(
+    replaceFromArrayByKeyValue(
+      [
+        { a: "1", b: "0" },
+        { a: "2", b: "0" },
+        { a: "3", b: "0" },
+      ],
+      { b: "0" },
+      { a: "lorem" },
+    ),
+  ).toMatchObject([
+    { a: "lorem", b: "0" },
+    { a: "2", b: "0" },
+    { a: "3", b: "0" },
+  ]);
+});

tests/splitIntoChunks.test.ts

@@ -0,0 +1,14 @@
+import { expect, test } from "@jest/globals";
+import { splitIntoChunks } from "../src";
+
+test("splits an array into chunks", () => {
+  // JSON.stringify is being used because there is no way to compare nested arrays in jest
+  expect(
+    JSON.stringify(splitIntoChunks(["a", "b", "c", "d", "e", "f"], 3)),
+  ).toBe(
+    JSON.stringify([
+      ["a", "b", "c"],
+      ["d", "e", "f"],
+    ]),
+  );
+});