Improve e2e tests: add npm install tests, add test matrix

test/e2e/npm.e2e.spec.js

@@ -0,0 +1,80 @@
+import { describe, it, before, beforeEach, afterEach } from "node:test";
+import { DockerTestContainer } from "./DockerTestContainer.js";
+import assert from "node:assert";
+
+describe("E2E: npm coverage", () => {
+  let container;
+
+  before(async () => {
+    DockerTestContainer.buildImage();
+  });
+
+  beforeEach(async () => {
+    // Run a new Docker container for each test
+    container = new DockerTestContainer();
+    await container.start();
+
+    const installationShell = await container.openShell("zsh");
+    await installationShell.runCommand("safe-chain setup");
+  });
+
+  afterEach(async () => {
+    // Stop and clean up the container after each test
+    if (container) {
+      await container.stop();
+      container = null;
+    }
+  });
+
+  it(`safe-chain succesfully installs safe packages`, async () => {
+    const shell = await container.openShell("zsh");
+    const result = await shell.runCommand("npm i axios");
+
+    assert.ok(
+      result.output.includes("No malicious packages detected."),
+      `Output did not include expected text. Output was:\n${result.output}`
+    );
+  });
+
+  it(`safe-chain blocks installation of malicious packages`, async () => {
+    const shell = await container.openShell("zsh");
+    const result = await shell.runCommand("npm i safe-chain-test");
+
+    assert.ok(
+      result.output.includes("Malicious changes detected:"),
+      `Output did not include expected text. Output was:\n${result.output}`
+    );
+    assert.ok(
+      result.output.includes("- safe-chain-test"),
+      `Output did not include expected text. Output was:\n${result.output}`
+    );
+    assert.ok(
+      result.output.includes("Exiting without installing malicious packages."),
+      `Output did not include expected text. Output was:\n${result.output}`
+    );
+
+    const listResult = await shell.runCommand("npm list");
+    assert.ok(
+      !listResult.output.includes("safe-chain-test"),
+      `Malicious package was installed despite safe-chain protection. Output of 'npm list' was:\n${listResult.output}`
+    );
+  });
+
+  it("safe-chain blocks npx from executing malicious packages", async () => {
+    const shell = await container.openShell("zsh");
+    const result = await shell.runCommand("npx safe-chain-test");
+
+    assert.ok(
+      result.output.includes("Malicious changes detected:"),
+      `Output did not include expected text. Output was:\n${result.output}`
+    );
+    assert.ok(
+      result.output.includes("- safe-chain-test"),
+      `Output did not include expected text. Output was:\n${result.output}`
+    );
+    assert.ok(
+      result.output.includes("Exiting without installing malicious packages."),
+      `Output did not include expected text. Output was:\n${result.output}`
+    );
+  });
+});