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

internal/handler/savings_test.go

@@ -0,0 +1,97 @@
+package handler
+
+import (
+	"bytes"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestSavingsHandler_CreateCategory_InvalidBody(t *testing.T) {
+	req := httptest.NewRequest("POST", "/savings/categories", bytes.NewBufferString("not json"))
+	rr := httptest.NewRecorder()
+
+	h := &SavingsHandler{repo: nil}
+	h.CreateCategory(rr, req)
+
+	if rr.Code != http.StatusBadRequest {
+		t.Errorf("expected 400, got %d", rr.Code)
+	}
+}
+
+func TestSavingsHandler_CreateCategory_EmptyName(t *testing.T) {
+	body := `{"name":""}`
+	req := httptest.NewRequest("POST", "/savings/categories", bytes.NewBufferString(body))
+	rr := httptest.NewRecorder()
+
+	h := &SavingsHandler{repo: nil}
+	h.CreateCategory(rr, req)
+
+	if rr.Code != http.StatusBadRequest {
+		t.Errorf("expected 400, got %d", rr.Code)
+	}
+}
+
+func TestSavingsHandler_CreateTransaction_InvalidBody(t *testing.T) {
+	req := httptest.NewRequest("POST", "/savings/transactions", bytes.NewBufferString("bad"))
+	rr := httptest.NewRecorder()
+
+	h := &SavingsHandler{repo: nil}
+	h.CreateTransaction(rr, req)
+
+	if rr.Code != http.StatusBadRequest {
+		t.Errorf("expected 400, got %d", rr.Code)
+	}
+}
+
+func TestSavingsHandler_CreateTransaction_Validation(t *testing.T) {
+	tests := []struct {
+		name string
+		body string
+	}{
+		{"missing category_id", `{"amount": 100, "type": "deposit", "date": "2026-01-01"}`},
+		{"zero amount", `{"category_id": 1, "amount": 0, "type": "deposit", "date": "2026-01-01"}`},
+		{"negative amount", `{"category_id": 1, "amount": -10, "type": "deposit", "date": "2026-01-01"}`},
+		{"invalid type", `{"category_id": 1, "amount": 100, "type": "invalid", "date": "2026-01-01"}`},
+		{"missing date", `{"category_id": 1, "amount": 100, "type": "deposit", "date": ""}`},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			req := httptest.NewRequest("POST", "/savings/transactions", bytes.NewBufferString(tt.body))
+			rr := httptest.NewRecorder()
+
+			h := &SavingsHandler{repo: nil}
+			h.CreateTransaction(rr, req)
+
+			if rr.Code != http.StatusBadRequest {
+				t.Errorf("expected 400, got %d", rr.Code)
+			}
+		})
+	}
+}
+
+func TestSavingsHandler_UpdateCategory_InvalidBody(t *testing.T) {
+	req := httptest.NewRequest("PUT", "/savings/categories/1", bytes.NewBufferString("bad"))
+	rr := httptest.NewRecorder()
+
+	h := &SavingsHandler{repo: nil}
+	h.UpdateCategory(rr, req)
+
+	// No chi route params → will fail on ParseInt → 400
+	if rr.Code != http.StatusBadRequest {
+		t.Errorf("expected 400, got %d", rr.Code)
+	}
+}
+
+func TestSavingsHandler_CreateRecurringPlan_InvalidBody(t *testing.T) {
+	req := httptest.NewRequest("POST", "/savings/categories/1/plans", bytes.NewBufferString("bad"))
+	rr := httptest.NewRecorder()
+
+	h := &SavingsHandler{repo: nil}
+	h.CreateRecurringPlan(rr, req)
+
+	if rr.Code != http.StatusBadRequest {
+		t.Errorf("expected 400, got %d", rr.Code)
+	}
+}