chore: add IPC acceptance tests

cliv2/internal/cliv2/cliv2.go

@@ -478,6 +478,11 @@ func (c *CLI) executeV1Default(proxyInfo *proxy.ProxyInfo, passThroughArgs []str
 
 func (c *CLI) getErrorFromFile(errFilePath string) (data error, err error) {
 	bytes, fileErr := os.ReadFile(errFilePath)
+	if os.IsNotExist(fileErr) {
+		c.DebugLogger.Println("No data was sent through the IPC file.")
+		return nil, fileErr
+	}
+
 	if fileErr != nil {
 		c.DebugLogger.Println("Failed to read error file: ", fileErr)
 		return nil, fileErr

test/jest/acceptance/ipc.spec.ts

@@ -0,0 +1,72 @@
+import { runSnykCLI } from '../util/runSnykCLI';
+
+describe('the IPC', () => {
+  const env = {
+    ...process.env,
+  };
+
+  describe('does not sends errors', () => {
+    it('for successful runs', async () => {
+      const { code, stderr } = await runSnykCLI(
+        `test --print-graph ./test/fixtures/npm/with-vulnerable-lodash-dep -d`,
+        {
+          env,
+        },
+      );
+
+      expect(code).toEqual(0);
+      expect(stderr).not.toContain('Error file contained ');
+    });
+
+    it('when vulnerabilities are found', async () => {
+      const { code, stderr } = await runSnykCLI(`test semver@2 -d`, {
+        env,
+      });
+
+      expect(code).toEqual(1);
+      expect(stderr).not.toContain('No data was sent through the IPC file.');
+      expect(stderr).not.toContain('Error file contained ');
+    });
+
+    it('for sarif output', async () => {
+      const { code, stderr } = await runSnykCLI(
+        `test ./test/fixtures/empty --sarif -d`,
+        {
+          env,
+        },
+      );
+
+      // For exit code 2 we will check the IPC file
+      expect(code).toEqual(2);
+      expect(stderr).toContain('No data was sent through the IPC file.');
+      expect(stderr).not.toContain('Error file contained ');
+    });
+  });
+
+  describe('sends and receives errors', () => {
+    it('for no supported files found', async () => {
+      const { code, stdout, stderr } = await runSnykCLI(
+        `test ./test/fixtures/empty -d`,
+        {
+          env,
+        },
+      );
+
+      expect(code).toEqual(3);
+      expect(stdout).toContain('SNYK-CLI-0000');
+      expect(stderr).toContain('SNYK-CLI-0000');
+      expect(stderr).toContain('Error file contained ');
+    });
+
+    it('for errors thrown', async () => {
+      const { code, stdout, stderr } = await runSnykCLI(`test ./not_here -d`, {
+        env,
+      });
+
+      expect(code).toEqual(2);
+      expect(stdout).toContain('SNYK-CLI-0000');
+      expect(stderr).toContain('SNYK-CLI-0000');
+      expect(stderr).toContain('Error file contained ');
+    });
+  });
+});