test: add tests for CLI

Also adds a timeout for mocha since running these new tests take a few seconds.

Author: Simon Renoult

package.json

@@ -25,7 +25,7 @@
     "prepare": "npm run lint && npm run build",
     "postversion": "git push --tags",
     "pretest": "npm run lint",
-    "test": "mocha --require ts-node/register test/**/*.ts",
+    "test": "mocha --timeout=5000 --require=ts-node/register test/**/*.ts",
     "test:ci": "nyc --reporter=lcov npm test"
   },
   "keywords": [

test/io/statistics.test.ts

@@ -0,0 +1,52 @@
+import { execSync } from "child_process";
+import TestRepositoryFixture from "../fixtures/test-repository.fixture";
+import { expect } from "chai";
+
+describe("CLI", () => {
+  context("when format is json", () => {
+    it("generates the appropriate output", () => {
+      // Given
+      const repo = new TestRepositoryFixture();
+      repo
+        .addFile({ name: "a.js", lines: 2, commits: 2 })
+        .addFile({ name: "b.ts", lines: 1, commits: 1 })
+        .writeOnDisk();
+
+      // When
+      const result = execSync(
+        `npx ts-node bin/code-complexity.ts ${repo.location} --format=json`,
+        { encoding: "utf8" }
+      ).trim();
+
+      // Then
+      expect(result).to.deep.equal(
+        JSON.stringify([
+          { path: "a.js", churn: 2, complexity: 2, score: 4 },
+          { path: "b.ts", churn: 1, complexity: 1, score: 1 },
+        ])
+      );
+    });
+  });
+
+  context("when format is csv", () => {
+    it("generates the appropriate output", () => {
+      // Given
+      const repo = new TestRepositoryFixture();
+      repo
+        .addFile({ name: "a.js", lines: 2, commits: 2 })
+        .addFile({ name: "b.ts", lines: 1, commits: 1 })
+        .writeOnDisk();
+
+      // When
+      const result = execSync(
+        `npx ts-node bin/code-complexity.ts ${repo.location} --format=csv`,
+        { encoding: "utf8" }
+      ).trim();
+
+      // Then
+      expect(result).to.deep.equal(
+        ["file,complexity,churn,score", "a.js,2,2,4", "b.ts,1,1,1"].join("\n")
+      );
+    });
+  });
+});