normalize git precon+UT

https://coveord.atlassian.net/browse/CDX-478

packages/cli/src/lib/decorators/preconditions/git.spec.ts

@@ -0,0 +1,85 @@
+jest.mock('../../utils/process');
+
+import {dedent} from 'ts-dedent';
+import {constants} from 'os';
+import {mocked} from 'ts-jest/utils';
+import {spawnProcessOutput} from '../../utils/process';
+import {getFakeCommand} from './testsUtils/utils';
+
+import {IsGitInstalled} from './git';
+
+describe('IsGitInstalled', () => {
+  const mockedSpawnProcessOutput = mocked(spawnProcessOutput);
+  beforeEach(() => {
+    jest.resetAllMocks();
+  });
+
+  describe('when git is not installed', () => {
+    beforeEach(() => {
+      mockedSpawnProcessOutput.mockResolvedValue({
+        exitCode: constants.errno.ENOENT,
+        stderr: 'spawn git ENOENT',
+        stdout: '',
+      });
+    });
+
+    it('should return false and warn', async () => {
+      const fakeCommand = getFakeCommand();
+
+      await expect(IsGitInstalled()(fakeCommand)).resolves.toBe(false);
+      expect(fakeCommand.warn).toHaveBeenCalledTimes(2);
+      expect(fakeCommand.warn).toHaveBeenNthCalledWith(
+        1,
+        'foo requires Git to run.'
+      );
+      expect(fakeCommand.warn).toHaveBeenNthCalledWith(
+        2,
+        dedent`
+       Please visit https://git-scm.com/book/en/v2/Getting-Started-Installing-Git for more detailed installation information.
+      `
+      );
+    });
+  });
+
+  describe('when an unknown error happens while checking for git', () => {
+    beforeEach(() => {
+      mockedSpawnProcessOutput.mockResolvedValue({
+        exitCode: 1,
+        stderr: 'some random error oh no',
+        stdout: '',
+      });
+    });
+
+    it('should return false and warn', async () => {
+      const fakeCommand = getFakeCommand();
+
+      await expect(IsGitInstalled()(fakeCommand)).resolves.toBe(false);
+      expect(fakeCommand.warn).toHaveBeenCalledTimes(2);
+      expect(fakeCommand.warn).toHaveBeenCalledWith(dedent`
+        foo requires a valid Git installation to run.
+        An unknown error happened while running git --version.
+        some random error oh no
+      `);
+      expect(fakeCommand.warn).toHaveBeenCalledWith(dedent`
+        Please visit https://git-scm.com/book/en/v2/Getting-Started-Installing-Git for more detailed installation information.
+      `);
+    });
+  });
+
+  describe('when git is installed', () => {
+    beforeEach(() => {
+      mockedSpawnProcessOutput.mockResolvedValue({
+        exitCode: 0,
+        stderr: '',
+        stdout: '',
+      });
+    });
+
+    it('should return true and not warn', async () => {
+      const fakeCommand = getFakeCommand();
+
+      await expect(IsGitInstalled()(fakeCommand)).resolves.toBe(true);
+      expect(fakeCommand.warn).toHaveBeenCalledTimes(0);
+    });
+  });
+});

packages/cli/src/lib/decorators/preconditions/git.ts

@@ -1,7 +1,6 @@
 import {getBinInstalledPrecondition} from './binPreconditionsFactory';
 
 export const IsGitInstalled = getBinInstalledPrecondition('git', {
-  prettyName: 'git',
-  howToInstallBinText:
-    'https://git-scm.com/book/en/v2/Getting-Started-Installing-Git',
+  prettyName: 'Git',
+  installLink: 'https://git-scm.com/book/en/v2/Getting-Started-Installing-Git',
 });