add unit tests

packages/hasher/package.json

@@ -23,7 +23,8 @@
     "globby": "^11.0.0",
     "find-up": "^4.1.0",
     "find-yarn-workspace-root": "^1.2.1",
-    "fs-extra": "^8.1.0"
+    "fs-extra": "^8.1.0",
+    "tempy": "^0.3.0"
   },
   "devDependencies": {
     "@types/fs-extra": "^8.0.0",

packages/hasher/src/__tests__/gitFiles.test.ts

@@ -0,0 +1,68 @@
+import path from "path";
+import { EOL } from "os";
+import fs from "fs-extra";
+import tempy from "tempy";
+
+import { getListOfGitFiles } from "../gitFiles";
+
+function expectAreSame<T>(array1: T[], array2: T[]): void {
+  expect(array1.length).toBe(array2.length);
+  array1.forEach((value, index) => {
+    expect(value).toBe(array2[index]);
+  });
+}
+
+describe("getFilesTrackedByGit()", () => {
+  it("when packageRoot is also repo root", async () => {
+    const cwd = tempy.directory();
+
+    // Creating very simple git repo
+    await fs.mkdirp(path.join(cwd, ".git"));
+    await fs.writeFile(path.join(cwd, ".gitignore"), "lib");
+    await fs.writeFile(path.join(cwd, "package.json"), "");
+    await fs.mkdirp(path.join(cwd, "lib"));
+    await fs.mkdirp(path.join(cwd, "src"));
+    await fs.writeFile(path.join(cwd, "src", "index.ts"), "");
+    await fs.writeFile(path.join(cwd, "lib", "index.js"), "");
+
+    const files = await getListOfGitFiles(cwd);
+
+    const expectedFiles = ["package.json", path.join("src", "index.ts")];
+
+    expectAreSame(files, expectedFiles);
+  });
+  it("when packageRoot is not repo root", async () => {
+    const repoRoot = tempy.directory();
+    const packageRoot = path.join(repoRoot, "packages", "foo");
+
+    // Creating git repo
+    await fs.mkdirp(path.join(repoRoot, ".git"));
+    await fs.writeFile(path.join(repoRoot, ".gitignore"), "lib");
+    await fs.writeFile(path.join(repoRoot, "package.json"), "");
+
+    await fs.mkdirp(packageRoot);
+    await fs.writeFile(
+      path.join(packageRoot, ".gitignore"),
+      `!lib${EOL}lib/*${EOL}!lib/index.d.ts`
+    );
+    await fs.writeFile(path.join(packageRoot, "package.json"), "");
+
+    await fs.mkdirp(path.join(packageRoot, "lib"));
+    await fs.mkdirp(path.join(packageRoot, "src"));
+    await fs.writeFile(path.join(packageRoot, "src", "index.ts"), "");
+    await fs.writeFile(path.join(packageRoot, "lib", "index.js"), "");
+    await fs.writeFile(path.join(packageRoot, "lib", "index.d.ts"), "");
+
+    const files = await getListOfGitFiles(packageRoot);
+
+    const expectedFiles = [
+      path.join("lib", "index.d.ts"),
+      "package.json",
+      path.join("src", "index.ts")
+    ];
+
+    console.log(files);
+
+    expectAreSame(files, expectedFiles);
+  });
+});