diff --git a/control-plane/pkg/apis/eventing/v1alpha1/implements_test.go b/control-plane/pkg/apis/eventing/v1alpha1/implements_test.go
new file mode 100644
index 0000000000..2cb5c8b55b
--- /dev/null
+++ b/control-plane/pkg/apis/eventing/v1alpha1/implements_test.go
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2020 The Knative 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.
+ */
+
+package v1alpha1
+
+import (
+	"testing"
+
+	"knative.dev/pkg/apis/duck"
+	duckv1 "knative.dev/pkg/apis/duck/v1"
+)
+
+func TestTypesImplements(t *testing.T) {
+	testCases := []struct {
+		instance interface{}
+		iface    duck.Implementable
+	}{
+		{instance: &KafkaSink{}, iface: &duckv1.Conditions{}},
+		{instance: &KafkaSink{}, iface: &duckv1.Addressable{}},
+	}
+	for _, tc := range testCases {
+		if err := duck.VerifyType(tc.instance, tc.iface); err != nil {
+			t.Error(err)
+		}
+	}
+}
diff --git a/control-plane/pkg/apis/sources/v1beta1/implements_test.go b/control-plane/pkg/apis/sources/v1beta1/implements_test.go
new file mode 100644
index 0000000000..13117a4cfe
--- /dev/null
+++ b/control-plane/pkg/apis/sources/v1beta1/implements_test.go
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2020 The Knative 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.
+ */
+
+package v1beta1
+
+import (
+	"testing"
+
+	"knative.dev/pkg/apis/duck"
+	duckv1 "knative.dev/pkg/apis/duck/v1"
+)
+
+func TestTypesImplements(t *testing.T) {
+	testCases := []struct {
+		instance interface{}
+		iface    duck.Implementable
+	}{
+		{instance: &KafkaSource{}, iface: &duckv1.Conditions{}},
+		{instance: &KafkaSource{}, iface: &duckv1.Source{}},
+	}
+	for _, tc := range testCases {
+		if err := duck.VerifyType(tc.instance, tc.iface); err != nil {
+			t.Error(err)
+		}
+	}
+}