Add jest test for validPrUrl

Author: jemmyw

jest.config.cjs

@@ -0,0 +1,5 @@
+/** @type {import('ts-jest/dist/types').InitialOptionsTsJest} */
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+};

package.json

@@ -125,7 +125,11 @@
   },
   "devDependencies": {
     "@types/inflected": "^1.1.29",
+    "@types/jest": "^28.1.8",
     "@types/react": "^17.0.3",
-    "@types/react-dom": "^17.0.3"
+    "@types/react-dom": "^17.0.3",
+    "jest": "^28.1.3",
+    "ts-jest": "^28.0.8",
+    "typescript": "^4.7.4"
   }
 }

src/lib/validPrUrl.test.ts

@@ -0,0 +1,22 @@
+import { validPrUrl } from "./validPrUrl";
+
+describe("validPrUrl", () => {
+  it("successed for valid urls", () => {
+    expect(
+      validPrUrl("https://github.com/example/project/pull/1")
+    ).toBeTruthy();
+  });
+
+  it("fails for invalid urls", () => {
+    [
+      "not a url",
+      "https://anotherdomain.com/example/project/pull/1",
+      "http://github.com/example/project/pull/1",
+      "https://github.com/example/pull/1",
+      "https://github.com/example/project/pulls/1",
+      "https://github.com/example/project/pull/a",
+    ].forEach((url) => {
+      expect(validPrUrl(url)).toBeFalsy();
+    });
+  });
+});