diff --git a/handler/auth.go b/handler/auth.go
index 0c3f79c..d48a589 100644
--- a/handler/auth.go
+++ b/handler/auth.go
@@ -76,7 +76,7 @@ func (handler HandlerAuthImpl) handleSignIn() http.HandlerFunc {
 				http.Error(w, "Invalid email or password", http.StatusUnauthorized)
 			} else {
 				utils.LogError("Error signing in", err)
-				http.Error(w, "An error occurred", http.StatusInternalServerError)
+				http.Error(w, "InternalServerErr", http.StatusInternalServerError)
 			}
 			return
 		}
diff --git a/handler/auth_test.go b/handler/auth_test.go
new file mode 100644
index 0000000..921902a
--- /dev/null
+++ b/handler/auth_test.go
@@ -0,0 +1,11 @@
+package handler
+
+import (
+	"testing"
+)
+
+func TestHandleSignIn(t *testing.T) {
+	t.Parallel()
+	t.Run("should signIn and return session cookie", func(t *testing.T) {
+	})
+}