contour envoy: Verify if hostPort does not exist

Check if the converted config does not contain the hostPort.

This commit also adds test to check if a certain JSONPath exists.

Signed-off-by: Suraj Deshmukh <suraj@kinvolk.io>

Author: surajssd

pkg/components/contour/component_test.go

@@ -130,3 +130,18 @@ func TestConversion(t *testing.T) {
 		})
 	}
 }
+
+func TestEnvoyHostPort(t *testing.T) {
+	t.Parallel()
+
+	componentCfg := `component "contour" {}`
+	expectedManifestName := k8sutil.ObjectMetadata{Version: "apps/v1", Kind: "DaemonSet", Name: "envoy"}
+	jsonPath := "{.spec.template.spec.containers[1].ports[0].hostPort}"
+	errExpected := "hostPort is not found"
+
+	component := NewConfig()
+	m := testutil.RenderManifests(t, component, Name, componentCfg)
+	gotConfig := testutil.ConfigFromMap(t, m, expectedManifestName)
+
+	testutil.JSONPathExists(t, gotConfig, jsonPath, errExpected)
+}

pkg/components/internal/testutil/jsonpath.go

@@ -102,3 +102,16 @@ func MatchJSONPathInt64Value(t *testing.T, yamlConfig string, jsonPath string, e
 		t.Fatalf("Expected: %d, Got: %d", expected, got)
 	}
 }
+
+// JSONPathExists checks if the given YAML config has an object at the given JSON path, also provide
+// what error to expect.
+func JSONPathExists(t *testing.T, yamlConfig string, jsonPath string, errExp string) {
+	_, err := jsonPathValue(yamlConfig, jsonPath)
+	if err != nil && errExp == "" { //nolint:gocritic
+		t.Fatalf("Error not expected and failed with: %v", err)
+	} else if err != nil && !strings.Contains(err.Error(), errExp) {
+		t.Fatalf("Extracting JSON path value, expected error: %v to contain: %q", err, errExp)
+	} else if err == nil && errExp != "" {
+		t.Fatalf("Expected error %q but got none", errExp)
+	}
+}