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// -
// ========================LICENSE_START=================================
// Copyright (C) 2024-2025: Deutsche Telekom
//
// 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.
// SPDX-License-Identifier: Apache-2.0
// ========================LICENSE_END===================================
//
package opasdk
import (
"errors"
"io"
"os"
"policy-opa-pdp/consts"
"testing"
"sync"
"context"
"fmt"
"bou.ke/monkey"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/mock"
"github.com/open-policy-agent/opa/sdk"
)
// Mock for os.Open
type MockFile struct {
mock.Mock
}
func (m *MockFile) Open(name string) (*os.File, error) {
args := m.Called(name)
return args.Get(0).(*os.File), args.Error(1)
}
// Mock for io.ReadAll
func mockReadAll(r io.Reader) ([]byte, error) {
return []byte(`{"config": "test"}`), nil
}
type MockSDK struct {
mock.Mock
}
func (m *MockSDK) New(ctx context.Context, options sdk.Options) (*sdk.OPA, error) {
fmt.Print("Inside New Method")
args := m.Called(ctx, options)
return args.Get(0).(*sdk.OPA), args.Error(1)
}
func TestGetOPASingletonInstance_ConfigurationFileNotexisting(t *testing.T) {
consts.OpasdkConfigPath = "/app/config/config.json"
opaInstance, err := GetOPASingletonInstance()
fmt.Print(err)
//assert.NotNil(t, err) //error no such file or directory /app/config/config.json
assert.NotNil(t, opaInstance)
}
func TestGetOPASingletonInstance_SingletonBehavior(t *testing.T) {
tmpFile, err := os.CreateTemp("", "config.json")
if err != nil {
t.Fatalf("Failed to create temp file: %v", err)
}
defer os.Remove(tmpFile.Name())
consts.OpasdkConfigPath = tmpFile.Name()
// Call the function multiple times
opaInstance1, err1 := GetOPASingletonInstance()
opaInstance2, err2 := GetOPASingletonInstance()
// Assertions
assert.Nil(t, err1)
assert.Nil(t, err2)
assert.NotNil(t, opaInstance1)
assert.NotNil(t, opaInstance2)
assert.Equal(t, opaInstance1, opaInstance2) // Ensure it's the same instance
}
func TestGetOPASingletonInstance_ConfigurationFileLoaded(t *testing.T) {
tmpFile, err := os.CreateTemp("", "config.json")
if err != nil {
t.Fatalf("Failed to create temp file: %v", err)
}
defer os.Remove(tmpFile.Name())
consts.OpasdkConfigPath = tmpFile.Name()
// Simulate OPA instance creation
opaInstance, err := GetOPASingletonInstance()
// Assertions
assert.Nil(t, err)
assert.NotNil(t, opaInstance)
}
func TestGetOPASingletonInstance_OPAInstanceCreation(t *testing.T) {
tmpFile, err := os.CreateTemp("", "config.json")
if err != nil {
t.Fatalf("Failed to create temp file: %v", err)
}
defer os.Remove(tmpFile.Name())
consts.OpasdkConfigPath = tmpFile.Name()
// Call the function
opaInstance, err := GetOPASingletonInstance()
// Assertions
assert.Nil(t, err)
assert.NotNil(t, opaInstance)
}
func TestGetOPASingletonInstance_JSONReadError(t *testing.T) {
consts.OpasdkConfigPath = "/app/config/config.json"
// Simulate an error in JSON read (e.g., corrupt file)
mockReadAll := func(r io.Reader) ([]byte, error) {
return nil, errors.New("Failed to read JSON file")
}
jsonReader, err := getJSONReader(consts.OpasdkConfigPath, os.Open, mockReadAll)
assert.NotNil(t, err)
assert.Nil(t, jsonReader)
}
func TestGetOPASingletonInstance_ValidConfigFile(t *testing.T) {
tmpFile, err := os.CreateTemp("", "config.json")
if err != nil {
t.Fatalf("Failed to create temp file: %v", err)
}
defer os.Remove(tmpFile.Name())
consts.OpasdkConfigPath = tmpFile.Name()
// Valid JSON content
validJSON := []byte(`{"config": "test"}`)
err = os.WriteFile(tmpFile.Name(), validJSON, 0644)
if err != nil {
t.Fatalf("Failed to write valid JSON to temp file: %v", err)
}
// Call the function
opaInstance, err := GetOPASingletonInstance()
assert.Nil(t, err)
assert.NotNil(t, opaInstance)
}
func TestGetJSONReader(t *testing.T) {
// Create a mock file
mockFile := new(MockFile)
mockFile.On("Open", "/app/config/config.json").Return(&os.File{}, nil)
// Call the function with mock functions
jsonReader, err := getJSONReader("/app/config/config.json", mockFile.Open, mockReadAll)
// Check the results
assert.NoError(t, err)
assert.NotNil(t, jsonReader)
// Check the content of the jsonReader
expectedContent := `{"config": "test"}`
actualContent := make([]byte, len(expectedContent))
jsonReader.Read(actualContent)
assert.Equal(t, expectedContent, string(actualContent))
// Assert that the mock methods were called
mockFile.AssertCalled(t, "Open", "/app/config/config.json")
}
func TestGetJSONReader_ReadAllError(t *testing.T) {
mockFile := new(MockFile)
mockFile.On("Open", "/app/config/config.json").Return(&os.File{}, nil)
// Simulate ReadAll error
jsonReader, err := getJSONReader("/app/config/config.json", mockFile.Open, func(r io.Reader) ([]byte, error) {
return nil, io.ErrUnexpectedEOF
})
assert.Error(t, err)
assert.Nil(t, jsonReader)
mockFile.AssertCalled(t, "Open", "/app/config/config.json")
}
func TestGetOPASingletonInstance(t *testing.T) {
// Call your function under test
opaInstance, err := GetOPASingletonInstance()
// Assertions
if err != nil {
t.Errorf("Expected no error, got %v", err)
}
if opaInstance == nil {
t.Error("Expected OPA instance, got nil")
}
assert.NotNil(t, opaInstance, "OPA instance should be nil when sdk.New fails")
}
// Helper to reset the singleton for testing
func resetSingleton() {
opaInstance = nil
once = sync.Once{}
}
// Test sdk.New failure scenario
func TestGetOPASingletonInstance_SdkNewFails(t *testing.T) {
resetSingleton()
// Patch sdk.New to simulate a failure
monkey.Patch(sdk.New, func(ctx context.Context, options sdk.Options) (*sdk.OPA, error) {
return nil, errors.New("mocked error in sdk.New")
})
defer monkey.Unpatch(sdk.New)
opaInstance, err := GetOPASingletonInstance()
assert.Nil(t, opaInstance, "OPA instance should be nil when sdk.New fails")
assert.Error(t, err, "Expected an error when sdk.New fails")
assert.Contains(t, err.Error(), "mocked error in sdk.New")
}
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