Add test for a type with known and unknown struct fields

Author: jennybuckley

merge/preserve_unknown_test.go

@@ -0,0 +1,88 @@
+/*
+Copyright 2019 The Kubernetes 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 merge_test
+
+import (
+	"testing"
+
+	"sigs.k8s.io/structured-merge-diff/fieldpath"
+	. "sigs.k8s.io/structured-merge-diff/internal/fixture"
+	"sigs.k8s.io/structured-merge-diff/typed"
+)
+
+var preserveUnknownParser = func() typed.ParseableType {
+	parser, err := typed.NewParser(`types:
+- name: type
+  map:
+    fields:
+      - name: num
+        type:
+          scalar: numeric
+    elementType:
+      scalar: string
+`)
+	if err != nil {
+		panic(err)
+	}
+	return parser.Type("type")
+}()
+
+func TestPreserveUnknownFields(t *testing.T) {
+	tests := map[string]TestCase{
+		"preserve_unknown_fields": {
+			Ops: []Operation{
+				Apply{
+					Manager: "default",
+					Object: `
+						num: 5
+						unknown: value
+					`,
+					APIVersion: "v1",
+				},
+				Apply{
+					Manager: "default",
+					Object: `
+						num: 6
+						unknown: new
+					`,
+					APIVersion: "v1",
+				},
+			},
+			Object: `
+				num: 6
+				unknown: new
+			`,
+			Managed: fieldpath.ManagedFields{
+				"default": &fieldpath.VersionedSet{
+					Set: _NS(
+						_P("num"),
+						_P("unknown"),
+					),
+					APIVersion: "v1",
+				},
+			},
+		},
+	}
+
+	for name, test := range tests {
+		t.Run(name, func(t *testing.T) {
+			if err := test.Test(preserveUnknownParser); err != nil {
+				t.Fatal(err)
+			}
+		})
+	}
+}