Add tests for System model

.github/workflows/main.yml

@@ -2,7 +2,7 @@ name: Actions 😎
 
 on:
   pull_request: {}
-  push: { branches: [master, debug-push-pipeline] }
+  push: { branches: [master] }
 
 env:
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src/model/system.js

@@ -19,7 +19,7 @@ class System {
       },
     };
 
-    const exitCode = await exec(command, arguments_, { ...options, listeners });
+    const exitCode = await exec(command, arguments_, { silent: true, listeners, ...options });
 
     if (debug !== '') {
       core.debug(debug);

src/model/system.test.js

@@ -0,0 +1,45 @@
+import * as core from '@actions/core';
+import System from './system';
+
+const info = jest.spyOn(core, 'info').mockImplementation(() => {});
+
+afterEach(() => {
+  jest.clearAllMocks();
+});
+
+describe('System', () => {
+  describe('run', () => {
+    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('throws when no arguments are given', async () => {
+      await expect(System.run()).rejects.toThrowError();
+    });
+
+    it('outputs info', async () => {
+      await expect(System.run('echo test')).resolves.not.toBeNull();
+      expect(info).toHaveBeenLastCalledWith('test\n');
+    });
+
+    it('outputs info only once', async () => {
+      await expect(System.run('echo 1')).resolves.not.toBeNull();
+      expect(info).toHaveBeenCalledTimes(1);
+      expect(info).toHaveBeenLastCalledWith('1\n');
+
+      info.mockClear();
+      await expect(System.run('echo 2')).resolves.not.toBeNull();
+      await expect(System.run('echo 3')).resolves.not.toBeNull();
+      expect(info).toHaveBeenCalledTimes(2);
+      expect(info).toHaveBeenLastCalledWith('3\n');
+    });
+  });
+});