diff --git a/packages/integration-react/src/api/ScmAuth.test.ts b/packages/integration-react/src/api/ScmAuth.test.ts
new file mode 100644
index 0000000000..ea0261f94b
--- /dev/null
+++ b/packages/integration-react/src/api/ScmAuth.test.ts
@@ -0,0 +1,65 @@
+/*
+ * Copyright 2021 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { OAuthApi } from '@backstage/core-plugin-api';
+import { ScmAuth } from './ScmAuth';
+
+class MockOAuthApi implements OAuthApi {
+  constructor(private readonly accessToken: string) {}
+
+  async getAccessToken() {
+    return this.accessToken;
+  }
+}
+
+const mockApis = {
+  github: new MockOAuthApi('github-access-token'),
+  ghe: new MockOAuthApi('ghe-access-token'),
+};
+
+describe('ScmAuth', () => {
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('should provide credentials for GitHub and GHE', async () => {
+    const api = ScmAuth.mux(
+      ScmAuth.forGithub(mockApis.github),
+      ScmAuth.forGithub(mockApis.ghe, {
+        hostname: 'ghe.example.com',
+      }),
+    );
+
+    await expect(
+      api.getCredentials({ url: 'https://github.com/backstage/backstage' }),
+    ).resolves.toEqual({
+      token: 'github-access-token',
+      headers: {
+        Authorization: 'Bearer github-access-token',
+      },
+    });
+    await expect(
+      api.getCredentials({
+        url: 'https://ghe.example.com/backstage/backstage',
+      }),
+    ).resolves.toEqual({
+      token: 'ghe-access-token',
+      headers: {
+        Authorization: 'Bearer ghe-access-token',
+      },
+    });
+  });
+});
diff --git a/packages/integration-react/src/api/ScmAuth.ts b/packages/integration-react/src/api/ScmAuth.ts
index 46f458d871..e7cbc91942 100644
--- a/packages/integration-react/src/api/ScmAuth.ts
+++ b/packages/integration-react/src/api/ScmAuth.ts
@@ -132,7 +132,7 @@ export class ScmAuth implements ScmAuthApi {
     });
   }
 
-  static mux(providers: ScmAuth[]): ScmAuthApi {
+  static mux(...providers: ScmAuth[]): ScmAuthApi {
     return new ScmAuthMux(providers);
   }