test: add jest test for runTest

test/run-test.spec.ts

@@ -0,0 +1,68 @@
+import { runTest } from '../src/lib/snyk-test/run-test';
+import * as optionsValidator from '../src/lib/options-validator';
+import { CustomError } from '../src/lib/errors/custom-error';
+import { Options, TestOptions } from '../src/lib/types';
+
+describe('CLI runTest - propagate correct user error', () => {
+  it('returns userMessage for a default error code', async () => {
+    jest.spyOn(optionsValidator, 'validateOptions').mockImplementation(() => {
+      const err = new CustomError('test');
+      err.userMessage = 'just a random error';
+      throw err;
+    });
+
+    // Dummy options in order to call to runTest
+    const options: Options & TestOptions = {
+      path: '',
+      traverseNodeModules: false,
+      interactive: false,
+      showVulnPaths: 'none',
+    };
+
+    await expect(runTest(undefined, '', options)).rejects.toThrow(
+      'just a random error',
+    );
+  });
+
+  it('returns userMessage for error code 404', async () => {
+    jest.spyOn(optionsValidator, 'validateOptions').mockImplementation(() => {
+      const err = new CustomError('FailedToGetVulnerabilitiesError');
+      err.code = 404;
+      err.userMessage = 'this is error 404';
+      throw err;
+    });
+
+    // Dummy options in order to call to runTest
+    const options: Options & TestOptions = {
+      path: '',
+      traverseNodeModules: false,
+      interactive: false,
+      showVulnPaths: 'none',
+    };
+
+    await expect(runTest(undefined, '', options)).rejects.toThrow(
+      'this is error 404',
+    );
+  });
+
+  it('returns right message for error code 403', async () => {
+    jest.spyOn(optionsValidator, 'validateOptions').mockImplementation(() => {
+      const err = new CustomError('Feature not allowed');
+      err.code = 403;
+      err.userMessage = 'this is error 403';
+      throw err;
+    });
+
+    // Dummy options in order to call to runTest
+    const options: Options & TestOptions = {
+      path: '',
+      traverseNodeModules: false,
+      interactive: false,
+      showVulnPaths: 'none',
+    };
+
+    await expect(runTest(undefined, '', options)).rejects.toThrow(
+      'Could not detect supported target files',
+    );
+  });
+});