added tests for new deepCloneWithBuffers fn

src/server/config/__tests__/deepCloneWithBuffers.js

@@ -0,0 +1,61 @@
+import deepCloneWithBuffers from '../deepCloneWithBuffers';
+import expect from 'expect.js';
+
+describe('deepCloneWithBuffers()', function () {
+  it('deep clones objects', function () {
+    const source = {
+      a: {
+        b: {},
+        c: {},
+        d: [
+          {
+            e: 'f'
+          }
+        ]
+      }
+    };
+
+    const output = deepCloneWithBuffers(source);
+
+    expect(source.a).to.eql(output.a);
+    expect(source.a).to.not.be(output.a);
+
+    expect(source.a.b).to.eql(output.a.b);
+    expect(source.a.b).to.not.be(output.a.b);
+
+    expect(source.a.c).to.eql(output.a.c);
+    expect(source.a.c).to.not.be(output.a.c);
+
+    expect(source.a.d).to.eql(output.a.d);
+    expect(source.a.d).to.not.be(output.a.d);
+
+    expect(source.a.d[0]).to.eql(output.a.d[0]);
+    expect(source.a.d[0]).to.not.be(output.a.d[0]);
+  });
+
+  it('copies buffers but keeps them buffers', function () {
+    const input = new Buffer('i am a teapot', 'utf8');
+    const output = deepCloneWithBuffers(input);
+
+    expect(Buffer.isBuffer(input)).to.be.ok();
+    expect(Buffer.isBuffer(output)).to.be.ok();
+    expect(Buffer.compare(output, input));
+    expect(output).to.not.be(input);
+  });
+
+  it('copies buffers that are deep', function () {
+    const input = {
+      a: {
+        b: {
+          c: new Buffer('i am a teapot', 'utf8')
+        }
+      }
+    };
+    const output = deepCloneWithBuffers(input);
+
+    expect(Buffer.isBuffer(input.a.b.c)).to.be.ok();
+    expect(Buffer.isBuffer(output.a.b.c)).to.be.ok();
+    expect(Buffer.compare(output.a.b.c, input.a.b.c));
+    expect(output.a.b.c).to.not.be(input.a.b.c);
+  });
+});