add function to find all matched patch targets

pkg/resmap/selector_test.go

@@ -0,0 +1,130 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.
+
+package resmap_test
+
+import (
+	"testing"
+
+	"sigs.k8s.io/kustomize/v3/pkg/gvk"
+	"sigs.k8s.io/kustomize/v3/pkg/resmap"
+	"sigs.k8s.io/kustomize/v3/pkg/types"
+)
+
+func setupRMForPatchTargets(t *testing.T) resmap.ResMap {
+	result, err := rmF.NewResMapFromBytes([]byte(`
+apiVersion: group1/v1
+kind: Kind1
+metadata:
+  name: name1
+  namespace: ns1
+  labels:
+    app: name1
+  annotations:
+    foo: bar
+---
+apiVersion: group1/v1
+kind: Kind1
+metadata:
+  name: name2
+  namespace: default
+  labels:
+    app: name2
+  annotations:
+    foo: bar
+---
+apiVersion: group1/v1
+kind: Kind2
+metadata:
+  name: name3
+  labels:
+    app: name3
+  annotations:
+    bar: baz
+`))
+	if err != nil {
+		t.Fatalf("unexpected error %v", err)
+	}
+	return result
+}
+
+func TestFindPatchTargets(t *testing.T) {
+	rm := setupRMForPatchTargets(t)
+	testcases := []struct {
+		target types.Selector
+		count  int
+	}{
+		{
+			target: types.Selector{
+				Name: "name*",
+			},
+			count: 3,
+		},
+		{
+			target: types.Selector{
+				Name:               "name*",
+				AnnotationSelector: "foo=bar",
+			},
+			count: 2,
+		},
+		{
+			target: types.Selector{
+				LabelSelector: "app=name1",
+			},
+			count: 1,
+		},
+		{
+			target: types.Selector{
+				Gvk: gvk.Gvk{
+					Kind: "Kind1",
+				},
+				Name: "name*",
+			},
+			count: 2,
+		},
+		{
+			target: types.Selector{
+				Name: "NotMatched",
+			},
+			count: 0,
+		},
+		{
+			target: types.Selector{
+				Name: "",
+			},
+			count: 3,
+		},
+		{
+			target: types.Selector{
+				Namespace: "default",
+			},
+			count: 2,
+		},
+		{
+			target: types.Selector{
+				Namespace: "",
+			},
+			count: 3,
+		},
+		{
+			target: types.Selector{
+				Namespace: "default",
+				Name:      "name*",
+				Gvk: gvk.Gvk{
+					Kind: "Kind1",
+				},
+			},
+			count: 1,
+		},
+	}
+	for _, testcase := range testcases {
+		actual, err := rm.Select(testcase.target)
+		if err != nil {
+			t.Errorf("unexpected error %v", err)
+		}
+		if len(actual) != testcase.count {
+			t.Errorf("expected %d objects, but got %d:\n%v", testcase.count, len(actual), actual)
+		}
+	}
+
+}