Add test for explain

pkg/kubectl/explain/recursive_fields_printer_test.go

@@ -0,0 +1,61 @@
+/*
+Copyright 2017 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 explain
+
+import (
+	"bytes"
+	"testing"
+
+	"k8s.io/apimachinery/pkg/runtime/schema"
+)
+
+func TestRecursiveFields(t *testing.T) {
+	schema := resources.LookupResource(schema.GroupVersionKind{
+		Group:   "",
+		Version: "v1",
+		Kind:    "OneKind",
+	})
+	if schema == nil {
+		t.Fatal("Couldn't find schema v1.OneKind")
+	}
+
+	want := `field1	<Object>
+   array	<[]integer>
+   int	<integer>
+   object	<map[string]string>
+   primitive	<string>
+   string	<string>
+field2	<[]map[string]string>
+`
+
+	buf := bytes.Buffer{}
+	f := Formatter{
+		Writer: &buf,
+		Wrap:   80,
+	}
+	s, err := LookupSchemaForField(schema, []string{})
+	if err != nil {
+		t.Fatalf("Invalid path %v: %v", []string{}, err)
+	}
+	if err := (fieldsPrinterBuilder{Recursive: true}).BuildFieldsPrinter(&f).PrintFields(s); err != nil {
+		t.Fatalf("Failed to print fields: %v", err)
+	}
+	got := buf.String()
+	if got != want {
+		t.Errorf("Got:\n%v\nWant:\n%v\n", buf.String(), want)
+	}
+}