Add test package with GetModuleRoot and PrependToPath function

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

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
+}