test: tkn tasks in yaml and Go code as the same

Signed-off-by: Matej Vasek <mvasek@redhat.com>

pkg/pipelines/tekton/task_defs_test.go

@@ -0,0 +1,51 @@
+package tekton_test
+
+import (
+	"os"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/tektoncd/pipeline/pkg/apis/pipeline/v1beta1"
+	k8sYaml "k8s.io/apimachinery/pkg/util/yaml"
+
+	"knative.dev/func/pkg/pipelines/tekton"
+)
+
+func TestTaskMatch(t *testing.T) {
+	for _, tt := range []struct {
+		path string
+		task v1beta1.Task
+	}{
+		{
+			path: "../resources/tekton/task/func-buildpacks/0.2/func-buildpacks.yaml",
+			task: tekton.BuildpackTask,
+		},
+		{
+			path: "../resources/tekton/task/func-s2i/0.2/func-s2i.yaml",
+			task: tekton.S2ITask,
+		},
+		{
+			path: "../resources/tekton/task/func-deploy/0.1/func-deploy.yaml",
+			task: tekton.DeployTask,
+		},
+	} {
+		t.Run(tt.task.Name, func(t *testing.T) {
+
+			f, err := os.Open(tt.path)
+			if err != nil {
+				t.Fatal(err)
+			}
+			defer f.Close()
+
+			dec := k8sYaml.NewYAMLToJSONDecoder(f)
+			var taskFromYaml v1beta1.Task
+			err = dec.Decode(&taskFromYaml)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if d := cmp.Diff(tt.task, taskFromYaml); d != "" {
+				t.Error("output missmatch (-want, +got):", d)
+			}
+		})
+	}
+}