Unit test updated to verify the user friendly error when the package …

…doesn't exist

pkg/apiserver/registry/datapackaging/package_crd_rest_test.go

@@ -146,6 +146,7 @@ func TestPackageVersionGetPresentInOnlyNS(t *testing.T) {
 func TestPackageVersionGetNotFound(t *testing.T) {
 	namespacedPackageVersion := excludedNonGlobalIntPackageVersion()
 	name := namespacedPackageName
+	expectedError := "package.data.packaging.carvel.dev \"" + name + "\" not found"
 
 	internalClient := fake.NewSimpleClientset(namespacedPackageVersion)
 	fakeCoreClient := k8sfake.NewSimpleClientset(namespace())
@@ -157,8 +158,8 @@ func TestPackageVersionGetNotFound(t *testing.T) {
 		t.Fatalf("Expected get operation to fail, but it didn't")
 	}
 
-	if !errors.IsNotFound(err) {
-		t.Fatalf("Expected a not found error, got: %v", err)
+	if !errors.IsNotFound(err) || err.Error() != expectedError {
+		t.Fatalf("Expected error : %s, got: %v", expectedError, err)
 	}
 
 }