io: move common function and add unit tests for it

pkg/io/fileWriter_test.go

@@ -0,0 +1,39 @@
+package io
+
+import (
+	"io/ioutil"
+	"os"
+	"path"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestMakeDirForFile_HappyPath(t *testing.T) {
+	tempDir, err := ioutil.TempDir("", "test")
+	require.NoError(t, err)
+
+	filePath := tempDir + "/testDir/testFile.test"
+	err = MakeDirForFile(filePath, "test")
+	defer removeDir(t, tempDir)
+	require.NoError(t, err)
+
+	_, errChDir := os.Create(filePath)
+	require.NoError(t, errChDir)
+}
+
+func removeDir(t *testing.T, dirName string) {
+	err := os.RemoveAll(dirName)
+	require.NoError(t, err)
+}
+
+func TestMakeDirForFile_Negative(t *testing.T) {
+	file, err := ioutil.TempFile("", "test")
+	require.NoError(t, err)
+
+	filePath := file.Name() + "/error"
+	dir := path.Dir(filePath)
+	err = MakeDirForFile(filePath, "test")
+	defer removeDir(t, dir)
+	require.Errorf(t, err, "could not create dir for test: mkdir %s : not a directory", filePath)
+}