Attempt to streamline dev lifecycle (git hooks) (#357)

* fix: misalignments in dev lifecycle

* fix: dist no longer added to staged

* fix: misalignments in dev lifecycle

* chore: multi-platform hooks and tests

* chore: multi-platform hooks and tests

* chore: add intention for colors

* chore: update lint-staged to fix color

* chore: update dist files

* feat: move to lefthook (remove husky and lint-staged)

* feat: move to lefthook (remove husky and lint-staged)

* fix: test aftereach

* fix: test aftereach

* fix: early restore call

* feat: jest fails if something gets logged to console

* chore: add todos of misplaced code

* chore: update dist files

* chore: move jest file

src/model/system.integration.test.ts

@@ -0,0 +1,46 @@
+import * as core from '@actions/core';
+import System from './system';
+
+jest.spyOn(core, 'debug').mockImplementation(() => {});
+jest.spyOn(core, 'info').mockImplementation(() => {});
+jest.spyOn(core, 'warning').mockImplementation(() => {});
+jest.spyOn(core, 'error').mockImplementation(() => {});
+
+afterEach(() => jest.clearAllMocks());
+
+describe('System', () => {
+  describe('run', () => {
+    /**
+     * Not all shells (e.g. Powershell, sh) have a reference to `echo` binary (absent or alias).
+     * To ensure our integration with '@actions/exec' works as expected we run some specific tests in CI only
+     */
+    describe('integration', () => {
+      if (!process.env.CI) {
+        it("doesn't run locally", () => {
+          expect(true).toBe(true);
+        });
+      } else {
+        it('runs a command successfully', async () => {
+          await expect(System.run('true')).resolves.not.toBeNull();
+        });
+
+        it('outputs results', async () => {
+          await expect(System.run('echo test')).resolves.toStrictEqual('test\n');
+        });
+
+        it('throws on when error code is not 0', async () => {
+          await expect(System.run('false')).rejects.toThrowError();
+        });
+
+        it('allows pipes using buffer', async () => {
+          await expect(
+            System.run('sh', undefined, {
+              input: Buffer.from('git tag --list --merged HEAD | grep v[0-9]* | wc -l'),
+              // eslint-disable-next-line github/no-then
+            }).then((result) => Number(result)),
+          ).resolves.not.toBeNaN();
+        });
+      }
+    });
+  });
+});