diff --git a/dir/path_test.go b/dir/path_test.go
index 638966eb..ffa20c01 100644
--- a/dir/path_test.go
+++ b/dir/path_test.go
@@ -43,6 +43,14 @@ func Test_UserConfigDirPath(t *testing.T) {
 	}
 }
 
+func Test_NoHomeVariable(t *testing.T) {
+	t.Setenv("HOME", "")
+	userConfigDir := UserConfigDirPath()
+	if userConfigDir != "notation" {
+		t.Fatalf(`UserConfigDirPath() = %q, want "notation"`, userConfigDir)
+	}
+}
+
 func Test_UserLibexecDirPath(t *testing.T) {
 	userConfigDir = mockGetUserConfig
 	got := UserLibexecDirPath()
@@ -51,7 +59,6 @@ func Test_UserLibexecDirPath(t *testing.T) {
 	}
 }
 
-
 func TestLocalKeyPath(t *testing.T) {
 	userConfigDir = mockGetUserConfig
 	loadUserPath()