Add unit tests

Author: dsame

__tests__/authutil.test.ts

@@ -123,6 +123,7 @@ describe('authutil tests', () => {
     expect(rc['registry']).toBe('https://registry.npmjs.org/');
     expect(rc['always-auth']).toBe('true');
   });
+
   it('It is already set the NODE_AUTH_TOKEN export it ', async () => {
     process.env.NODE_AUTH_TOKEN = 'foobar';
     await auth.configAuthentication('npm.pkg.github.com', 'false');
@@ -132,4 +133,29 @@ describe('authutil tests', () => {
     expect(rc['always-auth']).toBe('false');
     expect(process.env.NODE_AUTH_TOKEN).toEqual('foobar');
   });
+
+  it('configAuthentication should overwrite non-scoped registry', async () => {
+    fs.writeFileSync(rcFile, 'registry=NNN');
+    await auth.configAuthentication('https://registry.npmjs.org/', 'true');
+    let contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
+    expect(contents).toContain('registry=https://registry.npmjs.org/');
+  });
+
+  it('configAuthentication should overwrite non-scoped registry', async () => {
+    fs.writeFileSync(rcFile, 'registry=NNN');
+    await auth.configAuthentication('https://registry.npmjs.org/', 'true');
+    let contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
+    expect(contents).toContain('registry=https://registry.npmjs.org/');
+    expect(contents).not.toContain('registry=NNN');
+  });
+
+  it('configAuthentication should overwrite scoped registry', async () => {
+    process.env['INPUT_SCOPE'] = 'myScope';
+    fs.writeFileSync(rcFile, `registry=MMM${os.EOL}@myscope:registry=NNN`);
+    await auth.configAuthentication('https://registry.npmjs.org/', 'true');
+    let contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
+    expect(contents).toContain('registry=MMM');
+    expect(contents).toContain('@myscope:registry=https://registry.npmjs.org/');
+    expect(contents).not.toContain('@myscope:registry=NNN');
+  });
 });