Switch to ginkgo/gomega for tests

This switches over to ginkgo/gomega for tests, which makes writing
certain tests easier/more fluent in the future.

vendor/github.com/onsi/ginkgo/internal/writer/fake_writer.go

@@ -0,0 +1,36 @@
+package writer
+
+type FakeGinkgoWriter struct {
+	EventStream []string
+}
+
+func NewFake() *FakeGinkgoWriter {
+	return &FakeGinkgoWriter{
+		EventStream: []string{},
+	}
+}
+
+func (writer *FakeGinkgoWriter) AddEvent(event string) {
+	writer.EventStream = append(writer.EventStream, event)
+}
+
+func (writer *FakeGinkgoWriter) Truncate() {
+	writer.EventStream = append(writer.EventStream, "TRUNCATE")
+}
+
+func (writer *FakeGinkgoWriter) DumpOut() {
+	writer.EventStream = append(writer.EventStream, "DUMP")
+}
+
+func (writer *FakeGinkgoWriter) DumpOutWithHeader(header string) {
+	writer.EventStream = append(writer.EventStream, "DUMP_WITH_HEADER: "+header)
+}
+
+func (writer *FakeGinkgoWriter) Bytes() []byte {
+	writer.EventStream = append(writer.EventStream, "BYTES")
+	return nil
+}
+
+func (writer *FakeGinkgoWriter) Write(data []byte) (n int, err error) {
+	return 0, nil
+}