add a few unit tests

Author: ejizba

test/setup.test.ts

@@ -0,0 +1,46 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT License.
+
+import 'mocha';
+import { expect } from 'chai';
+import { capabilities, enableHttpStream, setup } from '../src/setup';
+
+describe('setup', () => {
+    it('enableHttpStream', () => {
+        // default
+        expect(enableHttpStream).to.equal(false);
+
+        // set to true
+        setup({ enableHttpStream: true });
+        expect(enableHttpStream).to.equal(true);
+
+        // don't change if not explicitly set
+        setup({});
+        expect(enableHttpStream).to.equal(true);
+        setup({ capabilities: {} });
+        expect(enableHttpStream).to.equal(true);
+
+        // set to true
+        setup({ enableHttpStream: false });
+        expect(enableHttpStream).to.equal(false);
+    });
+
+    it('capabilities', () => {
+        // default
+        expect(capabilities).to.deep.equal({});
+
+        // various setting & merging without replacing
+        setup({ capabilities: { a: '1' } });
+        expect(capabilities).to.deep.equal({ a: '1' });
+        setup({});
+        expect(capabilities).to.deep.equal({ a: '1' });
+        setup({ capabilities: { b: '2' } });
+        expect(capabilities).to.deep.equal({ a: '1', b: '2' });
+        setup({ capabilities: { a: '3' } });
+        expect(capabilities).to.deep.equal({ a: '3', b: '2' });
+
+        // boolean converted to string
+        setup({ capabilities: { c: true } });
+        expect(capabilities).to.deep.equal({ a: '3', b: '2', c: 'true' });
+    });
+});