test: add handler and config tests (auth, tasks, habits, savings, profile, interest, freeze)

internal/handler/profile_test.go

@@ -0,0 +1,20 @@
+package handler
+
+import (
+	"bytes"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestProfileHandler_Update_InvalidBody(t *testing.T) {
+	req := httptest.NewRequest("PUT", "/profile", bytes.NewBufferString("not json"))
+	rr := httptest.NewRecorder()
+
+	h := &ProfileHandler{userRepo: nil}
+	h.Update(rr, req)
+
+	if rr.Code != http.StatusBadRequest {
+		t.Errorf("expected 400, got %d", rr.Code)
+	}
+}