Add test package with GetModuleRoot and PrependToPath function

Signed-off-by: Evan Lezar <elezar@nvidia.com>

cmd/nvidia-container-runtime/main_test.go

@@ -3,15 +3,14 @@ package main
 import (
 	"bytes"
 	"encoding/json"
-	"fmt"
 	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
-	"runtime"
 	"strings"
 	"testing"
 
+	"github.com/NVIDIA/nvidia-container-toolkit/internal/test"
 	"github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/stretchr/testify/require"
 )
@@ -35,7 +34,7 @@ func TestMain(m *testing.M) {
 	// TEST SETUP
 	// Determine the module root and the test binary path
 	var err error
-	moduleRoot, err := getModuleRoot()
+	moduleRoot, err := test.GetModuleRoot()
 	if err != nil {
 		logger.Fatalf("error in test setup: could not get module root: %v", err)
 	}
@@ -43,7 +42,7 @@ func TestMain(m *testing.M) {
 	testInputPath := filepath.Join(moduleRoot, "test", "input")
 
 	// Set the environment variables for the test
-	os.Setenv("PATH", prependToPath(testBinPath, moduleRoot))
+	os.Setenv("PATH", test.PrependToPath(testBinPath, moduleRoot))
 	os.Setenv("XDG_CONFIG_HOME", testInputPath)
 
 	// Confirm that the environment is configured correctly
@@ -71,31 +70,6 @@ func TestMain(m *testing.M) {
 	os.Exit(exitCode)
 }
 
-func getModuleRoot() (string, error) {
-	_, filename, _, _ := runtime.Caller(0)
-
-	return hasGoMod(filename)
-}
-
-func hasGoMod(dir string) (string, error) {
-	if dir == "" || dir == "/" {
-		return "", fmt.Errorf("module root not found")
-	}
-
-	_, err := os.Stat(filepath.Join(dir, "go.mod"))
-	if err != nil {
-		return hasGoMod(filepath.Dir(dir))
-	}
-	return dir, nil
-}
-
-func prependToPath(additionalPaths ...string) string {
-	paths := strings.Split(os.Getenv("PATH"), ":")
-	paths = append(additionalPaths, paths...)
-
-	return strings.Join(paths, ":")
-}
-
 // case 1) nvidia-container-runtime run --bundle
 // case 2) nvidia-container-runtime create --bundle
 //		- Confirm the runtime handles bad input correctly

internal/oci/spec_test.go

@@ -1,17 +1,16 @@
 package oci
 
 import (
-	"fmt"
 	"os"
 	"path/filepath"
-	"runtime"
 	"testing"
 
+	"github.com/NVIDIA/nvidia-container-toolkit/internal/test"
 	"github.com/stretchr/testify/require"
 )
 
 func TestMaintainSpec(t *testing.T) {
-	moduleRoot, err := getModuleRoot()
+	moduleRoot, err := test.GetModuleRoot()
 	require.NoError(t, err)
 
 	files := []string{
@@ -38,21 +37,3 @@ func TestMaintainSpec(t *testing.T) {
 		require.JSONEq(t, string(inputContents), string(outputContents))
 	}
 }
-
-func getModuleRoot() (string, error) {
-	_, filename, _, _ := runtime.Caller(0)
-
-	return hasGoMod(filename)
-}
-
-func hasGoMod(dir string) (string, error) {
-	if dir == "" || dir == "/" {
-		return "", fmt.Errorf("module root not found")
-	}
-
-	_, err := os.Stat(filepath.Join(dir, "go.mod"))
-	if err != nil {
-		return hasGoMod(filepath.Dir(dir))
-	}
-	return dir, nil
-}

internal/test/test.go

@@ -0,0 +1,52 @@
+/**
+# Copyright (c) 2022, NVIDIA CORPORATION.  All rights reserved.
+#
+# 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 test
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
+)
+
+// GetModuleRoot returns the path to the root of the go module
+func GetModuleRoot() (string, error) {
+	_, filename, _, _ := runtime.Caller(0)
+
+	return hasGoMod(filename)
+}
+
+// PrependToPath prefixes the specified additional paths to the PATH environment variable
+func PrependToPath(additionalPaths ...string) string {
+	paths := strings.Split(os.Getenv("PATH"), ":")
+	paths = append(additionalPaths, paths...)
+
+	return strings.Join(paths, ":")
+}
+
+func hasGoMod(dir string) (string, error) {
+	if dir == "" || dir == "/" {
+		return "", fmt.Errorf("module root not found")
+	}
+
+	_, err := os.Stat(filepath.Join(dir, "go.mod"))
+	if err != nil {
+		return hasGoMod(filepath.Dir(dir))
+	}
+	return dir, nil
+}