diff --git a/config/setup/root_test.go b/config/setup/root_test.go
index f34e05d2b..8b38e6d04 100644
--- a/config/setup/root_test.go
+++ b/config/setup/root_test.go
@@ -26,9 +26,12 @@ func TestRoot(t *testing.T) {
 	if err != nil {
 		t.Fatalf("BeforeTest: Failed to create temp file for testing! Error was: %v", err)
 	}
-	defer os.Remove(existingFile.Name())
+	defer func() {
+		existingFile.Close()
+		os.Remove(existingFile.Name())
+	}()
 
-	unaccessiblePath := filepath.Join(existingFile.Name(), "some_name")
+	inaccessiblePath := getInaccessiblePath(existingFile.Name())
 
 	tests := []struct {
 		input              string
@@ -48,7 +51,7 @@ func TestRoot(t *testing.T) {
 			`root `, true, "", parseErrContent,
 		},
 		{
-			fmt.Sprintf(`root %s`, unaccessiblePath), true, "", unableToAccessErrContent,
+			fmt.Sprintf(`root %s`, inaccessiblePath), true, "", unableToAccessErrContent,
 		},
 		{
 			fmt.Sprintf(`root {
@@ -60,8 +63,9 @@ func TestRoot(t *testing.T) {
 	for i, test := range tests {
 		c := NewTestController(test.input)
 		mid, err := Root(c)
+
 		if test.shouldErr && err == nil {
-			t.Errorf("Test %d: Expected error but found nil for input %s", i, test.input)
+			t.Errorf("Test %d: Expected error but found %s for input %s", i, err, test.input)
 		}
 
 		if err != nil {
@@ -97,3 +101,8 @@ func getTempDirPath() (string, error) {
 
 	return tempDir, nil
 }
+
+func getInaccessiblePath(file string) string {
+	// null byte in filename is not allowed on Windows AND unix
+	return filepath.Join("C:", "file\x00name")
+}
diff --git a/middleware/commands_test.go b/middleware/commands_test.go
new file mode 100644
index 000000000..3a5b33342
--- /dev/null
+++ b/middleware/commands_test.go
@@ -0,0 +1,138 @@
+package middleware
+
+import (
+	"fmt"
+	"strings"
+	"testing"
+)
+
+func TestSplitCommandAndArgs(t *testing.T) {
+	var parseErrorContent = "error parsing command:"
+	var noCommandErrContent = "no command contained in"
+
+	tests := []struct {
+		input              string
+		expectedCommand    string
+		expectedArgs       []string
+		expectedErrContent string
+	}{
+		// Test case 0 - emtpy command
+		{
+			input:              ``,
+			expectedCommand:    ``,
+			expectedArgs:       nil,
+			expectedErrContent: noCommandErrContent,
+		},
+		// Test case 1 - command without arguments
+		{
+			input:              `command`,
+			expectedCommand:    `command`,
+			expectedArgs:       nil,
+			expectedErrContent: ``,
+		},
+		// Test case 2 - command with single argument
+		{
+			input:              `command arg1`,
+			expectedCommand:    `command`,
+			expectedArgs:       []string{`arg1`},
+			expectedErrContent: ``,
+		},
+		// Test case 3 - command with multiple arguments
+		{
+			input:              `command arg1 arg2`,
+			expectedCommand:    `command`,
+			expectedArgs:       []string{`arg1`, `arg2`},
+			expectedErrContent: ``,
+		},
+		// Test case 4 - command with single argument with space character - in quotes
+		{
+			input:              `command "arg1 arg1"`,
+			expectedCommand:    `command`,
+			expectedArgs:       []string{`arg1 arg1`},
+			expectedErrContent: ``,
+		},
+		// Test case 4 - command with single argument with space character - escaped
+		{
+			input:              `command arg1\ arg1`,
+			expectedCommand:    `command`,
+			expectedArgs:       []string{`arg1 arg1`},
+			expectedErrContent: ``,
+		},
+		// Test case 6 - command with escaped quote character
+		{
+			input:              `command "arg1 \" arg1"`,
+			expectedCommand:    `command`,
+			expectedArgs:       []string{`arg1 " arg1`},
+			expectedErrContent: ``,
+		},
+		// Test case 7 - command with escaped backslash
+		{
+			input:              `command '\arg1'`,
+			expectedCommand:    `command`,
+			expectedArgs:       []string{`\arg1`},
+			expectedErrContent: ``,
+		},
+		// Test case 8 - command with comments
+		{
+			input:              `command arg1 #comment1 comment2`,
+			expectedCommand:    `command`,
+			expectedArgs:       []string{`arg1`},
+			expectedErrContent: "",
+		},
+		// Test case 9 - command with multiple spaces and tab character
+		{
+			input:              "command arg1    arg2\targ3",
+			expectedCommand:    `command`,
+			expectedArgs:       []string{`arg1`, `arg2`, "arg3"},
+			expectedErrContent: "",
+		},
+		// Test case 10 - command with unclosed quotes
+		{
+			input:              `command "arg1 arg2`,
+			expectedCommand:    "",
+			expectedArgs:       nil,
+			expectedErrContent: parseErrorContent,
+		},
+		// Test case 11 - command with unclosed quotes
+		{
+			input:              `command 'arg1 arg2"`,
+			expectedCommand:    "",
+			expectedArgs:       nil,
+			expectedErrContent: parseErrorContent,
+		},
+	}
+
+	for i, test := range tests {
+		errorPrefix := fmt.Sprintf("Test [%d]: ", i)
+		errorSuffix := fmt.Sprintf(" Command to parse: [%s]", test.input)
+		actualCommand, actualArgs, actualErr := SplitCommandAndArgs(test.input)
+
+		// test if error matches expectation
+		if test.expectedErrContent != "" {
+			if actualErr == nil {
+				t.Errorf(errorPrefix+"Expected error with content [%s], found no error."+errorSuffix, test.expectedErrContent)
+			} else if !strings.Contains(actualErr.Error(), test.expectedErrContent) {
+				t.Errorf(errorPrefix+"Expected error with content [%s], found [%v]."+errorSuffix, test.expectedErrContent, actualErr)
+			}
+		} else if actualErr != nil {
+			t.Errorf(errorPrefix+"Expected no error, found [%v]."+errorSuffix, actualErr)
+		}
+
+		// test if command matches
+		if test.expectedCommand != actualCommand {
+			t.Errorf("Expected command: [%s], actual: [%s]."+errorSuffix, test.expectedCommand, actualCommand)
+		}
+
+		// test if arguments match
+		if len(test.expectedArgs) != len(actualArgs) {
+			t.Errorf("Wrong number of arguments! Expected [%v], actual [%v]."+errorSuffix, test.expectedArgs, actualArgs)
+		}
+
+		for j, actualArg := range actualArgs {
+			expectedArg := test.expectedArgs[j]
+			if actualArg != expectedArg {
+				t.Errorf(errorPrefix+"Argument at position [%d] differ! Expected [%s], actual [%s]"+errorSuffix, j, expectedArg, actualArg)
+			}
+		}
+	}
+}