pkg/printers/tablegenerator_test.go

/*
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 printers

import (
	"fmt"
	"reflect"
	"testing"

	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	metav1beta1 "k8s.io/apimachinery/pkg/apis/meta/v1beta1"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/runtime/schema"
)

type TestPrintType struct {
	Data string
}

func (obj *TestPrintType) GetObjectKind() schema.ObjectKind { return schema.EmptyObjectKind }
func (obj *TestPrintType) DeepCopyObject() runtime.Object {
	if obj == nil {
		return nil
	}
	clone := *obj
	return &clone
}

func PrintCustomType(obj *TestPrintType, options GenerateOptions) ([]metav1beta1.TableRow, error) {
	return []metav1beta1.TableRow{{Cells: []interface{}{obj.Data}}}, nil
}

func ErrorPrintHandler(obj *TestPrintType, options GenerateOptions) ([]metav1beta1.TableRow, error) {
	return nil, fmt.Errorf("ErrorPrintHandler error")
}

func TestCustomTypePrinting(t *testing.T) {
	columns := []metav1beta1.TableColumnDefinition{{Name: "Data"}}
	generator := NewTableGenerator()
	err := generator.TableHandler(columns, PrintCustomType)
	if err != nil {
		t.Fatalf("An error occurred when adds a print handler with a given set of columns: %#v", err)
	}

	obj := TestPrintType{"test object"}
	table, err := generator.GenerateTable(&obj, GenerateOptions{})
	if err != nil {
		t.Fatalf("An error occurred generating the table for custom type: %#v", err)
	}

	expectedTable := &metav1.Table{
		ColumnDefinitions: []metav1.TableColumnDefinition{{Name: "Data"}},
		Rows:              []metav1.TableRow{{Cells: []interface{}{"test object"}}},
	}
	if !reflect.DeepEqual(expectedTable, table) {
		t.Errorf("Error generating table from custom type. Expected (%#v), got (%#v)", expectedTable, table)
	}
}

func TestPrintHandlerError(t *testing.T) {
	columns := []metav1beta1.TableColumnDefinition{{Name: "Data"}}
	generator := NewTableGenerator()
	err := generator.TableHandler(columns, ErrorPrintHandler)
	if err != nil {
		t.Fatalf("An error occurred when adds a print handler with a given set of columns: %#v", err)
	}

	obj := TestPrintType{"test object"}
	_, err = generator.GenerateTable(&obj, GenerateOptions{})
	if err == nil || err.Error() != "ErrorPrintHandler error" {
		t.Errorf("Did not get the expected error: %#v", err)
	}
}