Add unit tests for common/array files

.gitignore

@@ -50,3 +50,6 @@ src/cast/dev_const.ts
 
 # Jetbrains
 /.idea/
+
+# test coverage
+test/coverage/

package.json

@@ -19,7 +19,8 @@
     "postinstall": "husky",
     "prepack": "pinst --disable",
     "postpack": "pinst --enable",
-    "test": "vitest run --config test/vitest.config.ts"
+    "test": "vitest run --config test/vitest.config.ts",
+    "test:coverage": "vitest run --config test/vitest.config.ts --coverage"
   },
   "author": "Paulus Schoutsen <[email protected]> (http://paulusschoutsen.nl)",
   "license": "Apache-2.0",
@@ -189,6 +190,7 @@
     "@types/webspeechapi": "0.0.29",
     "@typescript-eslint/eslint-plugin": "7.18.0",
     "@typescript-eslint/parser": "7.18.0",
+    "@vitest/coverage-v8": "2.1.5",
     "@web/dev-server": "0.1.38",
     "babel-loader": "9.2.1",
     "babel-plugin-template-html-minifier": "4.1.0",

src/common/array/combinations.ts

@@ -1,3 +1,8 @@
+/**
+ * Get all possible combinations of an array
+ * @param arr - The array to get combinations of
+ * @returns A multidimensional array of all possible combinations
+ */
 export function getAllCombinations<T>(arr: T[]) {
   return arr.reduce<T[][]>(
     (combinations, element) =>

src/common/array/ensure-array.ts

@@ -1,5 +1,9 @@
 type NonUndefined<T> = T extends undefined ? never : T;
 
+/**
+ * Ensure that the input is an array or wrap it in an array
+ * @param value - The value to ensure is an array
+ */
 export function ensureArray(value: undefined): undefined;
 export function ensureArray<T>(value: T | T[]): NonUndefined<T>[];
 export function ensureArray<T>(value: T | readonly T[]): NonUndefined<T>[];

src/common/array/literal-includes.ts

@@ -1,4 +1,8 @@
-// Creates a type predicate function for determining if an array literal includes a given value
+/**
+ * Creates a type predicate function for determining if an array literal includes a given value
+ * @param array - The array to check
+ * @returns A type predicate function
+ */
 export const arrayLiteralIncludes =
   <T extends readonly unknown[]>(array: T) =>
   (searchElement: unknown, fromIndex?: number): searchElement is T[number] =>

test/common/array/combination.test.ts

@@ -0,0 +1,33 @@
+import { describe, expect, it } from "vitest";
+import { getAllCombinations } from "../../../src/common/array/combinations";
+
+describe("getAllCombinations", () => {
+  it("should return all combinations of an array", () => {
+    const result = getAllCombinations([1, 2, 3]);
+    expect(result).toEqual([
+      [],
+      [1],
+      [2],
+      [1, 2],
+      [3],
+      [1, 3],
+      [2, 3],
+      [1, 2, 3],
+    ]);
+  });
+
+  it("should return an empty array for an empty input", () => {
+    const result = getAllCombinations([]);
+    expect(result).toEqual([[]]);
+  });
+
+  it("should handle an array with one element", () => {
+    const result = getAllCombinations([1]);
+    expect(result).toEqual([[], [1]]);
+  });
+
+  it("should handle an array with duplicate elements", () => {
+    const result = getAllCombinations([1, 1]);
+    expect(result).toEqual([[], [1], [1], [1, 1]]);
+  });
+});

test/common/array/ensure-array.test.ts

@@ -0,0 +1,28 @@
+import { describe, expect, it } from "vitest";
+import { ensureArray } from "../../../src/common/array/ensure-array";
+
+describe("ensureArray", () => {
+  it("should return undefined when input is undefined", () => {
+    expect(ensureArray(undefined)).toBeUndefined();
+  });
+
+  it("should return the same array when input is an array", () => {
+    const arr = [1, 2, 3];
+    expect(ensureArray(arr)).toBe(arr);
+  });
+
+  it("should wrap non-array value in an array", () => {
+    const value = 5;
+    expect(ensureArray(value)).toEqual([value]);
+  });
+
+  it("should wrap non-array object in an array", () => {
+    const value = { key: "value" };
+    expect(ensureArray(value)).toEqual([value]);
+  });
+
+  it("should return the same readonly array when input is a readonly array", () => {
+    const arr = [1, 2, 3] as const;
+    expect(ensureArray(arr)).toBe(arr);
+  });
+});

test/common/array/literal-includes.test.ts

@@ -0,0 +1,30 @@
+import { describe, it, expect } from "vitest";
+import { arrayLiteralIncludes } from "../../../src/common/array/literal-includes";
+
+describe("arrayLiteralIncludes", () => {
+  const array = ["a", "b", "c"] as const;
+  const includes = arrayLiteralIncludes(array);
+
+  it("should return true if the element is in the array", () => {
+    expect(includes("a")).toBe(true);
+    expect(includes("b")).toBe(true);
+    expect(includes("c")).toBe(true);
+  });
+
+  it("should return false if the element is not in the array", () => {
+    expect(includes("d")).toBe(false);
+    expect(includes(1)).toBe(false);
+  });
+
+  it("should respect the fromIndex parameter", () => {
+    expect(includes("a", 1)).toBe(false);
+    expect(includes("b", 1)).toBe(true);
+  });
+
+  it("should handle empty arrays", () => {
+    const emptyArray = [] as const;
+    const includesEmpty = arrayLiteralIncludes(emptyArray);
+
+    expect(includesEmpty("a")).toBe(false);
+  });
+});

test/vitest.config.ts

@@ -7,5 +7,11 @@ export default defineConfig({
       IS_TEST: "true",
     },
     setupFiles: ["./test/setup.ts"],
+    coverage: {
+      include: ["src/data/**/*", "src/common/**/*"],
+      reporter: ["text", "html"],
+      provider: "v8",
+      reportsDirectory: "test/coverage",
+    },
   },
 });

yarn.lock

@@ -5,7 +5,7 @@ __metadata:
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   cacheKey: 10
 
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   resolution: "@ampproject/remapping@npm:2.3.0"
   dependencies:
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@@ -1271,6 +1271,13 @@ __metadata:
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+  resolution: "@bcoe/v8-coverage@npm:0.2.3"
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+
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+  languageName: node
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+  version: 2.1.5
+  resolution: "@vitest/coverage-v8@npm:2.1.5"
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+    debug: "npm:^4.3.7"
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+    magic-string: "npm:^0.30.12"
+    magicast: "npm:^0.3.5"
+    std-env: "npm:^3.8.0"
+    test-exclude: "npm:^7.0.1"
+    tinyrainbow: "npm:^1.2.0"
+  peerDependencies:
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+    vitest: 2.1.5
+  peerDependenciesMeta:
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+  checksum: 10/14c90c9201f480b7a028086f05063a89e55897bce005f8bef322089775473384ece3acf63e2b819f50eb650bac68b3e6b30f7bd07e13e7772f4d12e739116191
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   resolution: "@vitest/expect@npm:2.1.5"
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+    "@vitest/coverage-v8": "npm:2.1.5"
     "@vue/web-component-wrapper": "npm:1.3.0"
     "@web/dev-server": "npm:0.1.38"
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