diff --git a/api/types/kustomization_test.go b/api/types/kustomization_test.go
new file mode 100644
index 000000000..f3482d90e
--- /dev/null
+++ b/api/types/kustomization_test.go
@@ -0,0 +1,184 @@
+package types
+
+import (
+	"testing"
+)
+
+func fixKustomizationPostUnmarshallingCheck(k, e *Kustomization) bool {
+	return (k.Kind == e.Kind && k.APIVersion == e.APIVersion &&
+		len(k.Resources) == len(e.Resources) && k.Resources[0] == e.Resources[0] &&
+		k.Bases == nil)
+}
+
+func TestFixKustomizationPostUnmarshalling(t *testing.T) {
+	var k Kustomization
+	k.Bases = append(k.Bases, "foo")
+	k.FixKustomizationPostUnmarshalling()
+
+	expected := Kustomization{
+		TypeMeta: TypeMeta{
+			Kind:       KustomizationKind,
+			APIVersion: KustomizationVersion,
+		},
+		Resources: []string{"foo"},
+	}
+
+	if !fixKustomizationPostUnmarshallingCheck(&k, &expected) {
+		t.Fatalf("unexpected ouput: %v", k)
+	}
+}
+
+func TestFixKustomizationPostUnmarshalling_2(t *testing.T) {
+	k := Kustomization{
+		TypeMeta: TypeMeta{
+			Kind: ComponentKind,
+		},
+	}
+	k.Bases = append(k.Bases, "foo")
+	k.FixKustomizationPostUnmarshalling()
+
+	expected := Kustomization{
+		TypeMeta: TypeMeta{
+			Kind:       ComponentKind,
+			APIVersion: ComponentVersion,
+		},
+		Resources: []string{"foo"},
+	}
+
+	if !fixKustomizationPostUnmarshallingCheck(&k, &expected) {
+		t.Fatalf("unexpected ouput: %v", k)
+	}
+}
+
+func TestEnforceFields_InvalidKindAndVersion(t *testing.T) {
+	k := Kustomization{
+		TypeMeta: TypeMeta{
+			Kind:       "foo",
+			APIVersion: "bar",
+		},
+	}
+
+	errs := k.EnforceFields()
+	if len(errs) != 2 {
+		t.Fatalf("number of errors should be 2 but got: %v", errs)
+	}
+}
+
+func TestEnforceFields_InvalidKind(t *testing.T) {
+	k := Kustomization{
+		TypeMeta: TypeMeta{
+			Kind:       "foo",
+			APIVersion: KustomizationVersion,
+		},
+	}
+
+	errs := k.EnforceFields()
+	if len(errs) != 1 {
+		t.Fatalf("number of errors should be 1 but got: %v", errs)
+	}
+
+	expected := "kind should be " + KustomizationKind + " or " + ComponentKind
+	if errs[0] != expected {
+		t.Fatalf("error should be %v but got: %v", expected, errs[0])
+	}
+}
+
+func TestEnforceFields_InvalidVersion(t *testing.T) {
+	k := Kustomization{
+		TypeMeta: TypeMeta{
+			Kind:       KustomizationKind,
+			APIVersion: "bar",
+		},
+	}
+
+	errs := k.EnforceFields()
+	if len(errs) != 1 {
+		t.Fatalf("number of errors should be 1 but got: %v", errs)
+	}
+
+	expected := "apiVersion for " + k.Kind + " should be " + KustomizationVersion
+	if errs[0] != expected {
+		t.Fatalf("error should be %v but got: %v", expected, errs[0])
+	}
+}
+
+func TestEnforceFields_ComponentKind(t *testing.T) {
+	k := Kustomization{
+		TypeMeta: TypeMeta{
+			Kind:       ComponentKind,
+			APIVersion: "bar",
+		},
+	}
+
+	errs := k.EnforceFields()
+	if len(errs) != 1 {
+		t.Fatalf("number of errors should be 1 but got: %v", errs)
+	}
+
+	expected := "apiVersion for " + k.Kind + " should be " + ComponentVersion
+	if errs[0] != expected {
+		t.Fatalf("error should be %v but got: %v", expected, errs[0])
+	}
+}
+
+func TestEnforceFields(t *testing.T) {
+	k := Kustomization{
+		TypeMeta: TypeMeta{
+			Kind:       KustomizationKind,
+			APIVersion: KustomizationVersion,
+		},
+	}
+
+	errs := k.EnforceFields()
+	if len(errs) != 0 {
+		t.Fatalf("number of errors should be 0 but got: %v", errs)
+	}
+}
+
+func TestUnmarshal(t *testing.T) {
+	y := []byte(`
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+- foo
+- bar
+nameSuffix: dog
+namePrefix: cat`)
+	var k Kustomization
+	err := k.Unmarshal(y)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if k.Kind != KustomizationKind || k.APIVersion != KustomizationVersion ||
+		len(k.Resources) != 2 || k.NamePrefix != "cat" || k.NameSuffix != "dog" {
+		t.Fatalf("wrong unmarshal result: %v", k)
+	}
+}
+
+func TestUnmarshal_UnkownField(t *testing.T) {
+	y := []byte(`
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+unknown: foo`)
+	var k Kustomization
+	err := k.Unmarshal(y)
+	if err == nil {
+		t.Fatalf("expect an error")
+	}
+	expect := "json: unknown field \"unknown\""
+	if err.Error() != expect {
+		t.Fatalf("expect %v but got: %v", expect, err.Error())
+	}
+}
+
+func TestUnmarshal_InvalidYaml(t *testing.T) {
+	y := []byte(`
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+unknown`)
+	var k Kustomization
+	err := k.Unmarshal(y)
+	if err == nil {
+		t.Fatalf("expect an error")
+	}
+}