diff --git a/test/TestApp.ts b/test/TestApp.ts
new file mode 100644
index 0000000..dd9820d
--- /dev/null
+++ b/test/TestApp.ts
@@ -0,0 +1,7 @@
+import { expect } from 'chai';
+
+import { main } from '../src/app';
+
+describe('main function', async () => {
+  it('should exit 1', async () => expect(main([])).to.eventually.equal(1));
+});
diff --git a/test/type/TestStream.ts b/test/type/TestStream.ts
new file mode 100644
index 0000000..ea7621b
--- /dev/null
+++ b/test/type/TestStream.ts
@@ -0,0 +1,26 @@
+import { NotFoundError } from '@apextoaster/js-utils';
+import { expect } from 'chai';
+
+import { streamType } from '../../src/type/Stream';
+
+describe('stream config type', async () => {
+  it('should resolve existing streams', async () => {
+    expect(streamType.resolve('stdout')).to.equal(true);
+  });
+
+  it('should reject missing streams');
+  it('should reject other properties', async () => {
+    expect(() => streamType.resolve('env')).to.throw(NotFoundError);
+  });
+
+  it('should construct streams from process', async () => {
+    expect(streamType.construct('stdout')).to.equal(process.stdout);
+  });
+
+  /**
+   * TODO: throw
+   */
+  it('should throw when constructing missing streams', async () => {
+    expect(streamType.construct('bob')).to.equal(undefined);
+  });
+});