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

internal/handler/interest_test.go

@@ -0,0 +1,33 @@
+package handler
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestInterestHandler_CalculateInterest_Unauthorized(t *testing.T) {
+	h := &InterestHandler{
+		service:   nil,
+		secretKey: "test-secret",
+	}
+
+	// No header
+	req := httptest.NewRequest("POST", "/internal/calculate-interest", nil)
+	rr := httptest.NewRecorder()
+	h.CalculateInterest(rr, req)
+
+	if rr.Code != http.StatusUnauthorized {
+		t.Errorf("expected 401, got %d", rr.Code)
+	}
+
+	// Wrong header
+	req2 := httptest.NewRequest("POST", "/internal/calculate-interest", nil)
+	req2.Header.Set("X-Internal-Key", "wrong-key")
+	rr2 := httptest.NewRecorder()
+	h.CalculateInterest(rr2, req2)
+
+	if rr2.Code != http.StatusUnauthorized {
+		t.Errorf("expected 401, got %d", rr2.Code)
+	}
+}