chore: run jest tests on compiled sources (#200)

Author: kormide

.gitignore

@@ -1,3 +1,4 @@
+build
 dist
 node_modules
 .DS_Store

babel.config.json

@@ -0,0 +1,3 @@
+{
+  "presets": ["@babel/preset-env"]
+}

e2e/helpers/fixture.ts

@@ -4,7 +4,14 @@ import os from "node:os";
 import path from "node:path";
 import simpleGit, { SimpleGit } from "simple-git";
 
-export const FIXTURES_PATH = path.join(__dirname, "..", "fixtures");
+export const FIXTURES_PATH = path.join(
+  __dirname,
+  "..",
+  "..",
+  "..",
+  "e2e",
+  "fixtures"
+);
 export const PREPARED_FIXTURES_PATH = fs.mkdtempSync(
   os.tmpdir() + path.sep + "fixtures-"
 );

e2e/stubs/cloud-functions.ts

@@ -30,7 +30,7 @@ export class CloudFunctions implements StubbedServer {
       ],
       {
         stdio: "inherit",
-        cwd: path.join(__dirname, "..", "..", "dist", "publish-to-bcr"),
+        cwd: path.join(__dirname, "..", "..", "..", "dist", "publish-to-bcr"),
         env: {
           ...process.env,
           INTEGRATION_TESTING: "1",

jest-snapshot-resolver.js

@@ -0,0 +1,27 @@
+import path from "path";
+
+// Because jest snapshot tests run in the build directory, we need to map
+// the saved snapshot location back to the source tree.
+export function resolveSnapshotPath(testPath, snapshotExtension) {
+  const pathInSourceTree = path.relative("build", testPath);
+  const dirname = path.dirname(pathInSourceTree);
+  return path.join(
+    dirname,
+    "__snapshots__",
+    path.basename(pathInSourceTree).replace(".js", ".ts.snap")
+  );
+}
+
+export function resolveTestPath(snapshotFilePath, snapshotExtension) {
+  return path
+    .join("build", snapshotFilePath.replace("__snapshots__", ""))
+    .replace(".ts.snap", ".js");
+}
+
+export const testPathForConsistencyCheck = "e2e/e2e.spec.js";
+
+export default {
+  resolveSnapshotPath,
+  resolveTestPath,
+  testPathForConsistencyCheck,
+};

jest.config.js

@@ -0,0 +1,26 @@
+/*
+ * For a detailed explanation regarding each configuration property and type check, visit:
+ * https://jestjs.io/docs/configuration
+ */
+
+export default {
+  // Automatically clear mock calls, instances, contexts and results before every test
+  clearMocks: true,
+
+  // The root directory that Jest should scan for tests and modules within.
+  rootDir: "build",
+
+  // A list of paths to directories that Jest should use to search for files in.
+  roots: ["src", "e2e"],
+
+  // A list of paths to modules that run some code to configure or set up the testing framework before each test
+  setupFilesAfterEnv: ["./jest.setup.js"],
+
+  // The path to a module that can resolve test<->snapshot path.
+  snapshotResolver: "./jest-snapshot-resolver.js",
+
+  // A map from regular expressions to paths to transformers
+  transform: {
+    "\\.js$": "babel-jest",
+  },
+};

jest.config.ts

@@ -8,10 +8,11 @@
     "pnpm": "^8"
   },
   "scripts": {
-    "prebuild": "node tools/clean-dist-files.js",
-    "build": "tsc && node tools/copy-dist-files.js",
+    "prebuild": "node tools/clean.js",
+    "build": "tsc && cp babel.config.json build/ && node tools/copy-dist-files.js",
     "//gcp-build": "Don't run any build steps on cloud run. See https://cloud.google.com/functions/docs/concepts/nodejs-runtime#npm_build_script/",
     "gcp-build": "",
+    "pretest": "pnpm run build",
     "test": "jest src",
     "pree2e": "pnpm run build",
     "e2e": "jest e2e"
@@ -43,6 +44,7 @@
     "yaml": "^2.1.1"
   },
   "devDependencies": {
+    "@babel/preset-env": "^7.26.0",
     "@jest/globals": "^29.7.0",
     "@octokit/webhooks-methods": "^4.0.0",
     "@types/archiver": "^6.0.2",
@@ -56,6 +58,7 @@
     "@types/tar": "^6.1.10",
     "@types/uuid": "^9.0.0",
     "archiver": "^6.0.1",
+    "babel-jest": "^29.7.0",
     "expect": "^28.1.3",
     "globby": "^14.0.0",
     "imapflow": "^1.0.147",
@@ -65,8 +68,6 @@
     "mailparser": "3.6.6",
     "mockttp": "^3.10.0",
     "portfinder": "^1.0.32",
-    "ts-jest": "^29.2.5",
-    "ts-node": "^10.9.1",
     "typescript": "^5.0.0"
   },
   "pnpm": {