test: expand handler tests to 53.4% coverage

internal/model/finance_test.go

@@ -0,0 +1,58 @@
+package model
+
+import (
+	"database/sql"
+	"testing"
+)
+
+func TestFinanceCategory_ProcessForJSON(t *testing.T) {
+	tests := []struct {
+		name      string
+		budget    sql.NullFloat64
+		wantNil   bool
+		wantValue float64
+	}{
+		{
+			name:      "with valid budget",
+			budget:    sql.NullFloat64{Float64: 5000.0, Valid: true},
+			wantNil:   false,
+			wantValue: 5000.0,
+		},
+		{
+			name:    "with null budget",
+			budget:  sql.NullFloat64{Valid: false},
+			wantNil: true,
+		},
+		{
+			name:      "with zero valid budget",
+			budget:    sql.NullFloat64{Float64: 0, Valid: true},
+			wantNil:   false,
+			wantValue: 0,
+		},
+		{
+			name:      "with negative budget",
+			budget:    sql.NullFloat64{Float64: -100.5, Valid: true},
+			wantNil:   false,
+			wantValue: -100.5,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			c := &FinanceCategory{Budget: tt.budget}
+			c.ProcessForJSON()
+			if tt.wantNil {
+				if c.BudgetVal != nil {
+					t.Errorf("expected nil BudgetVal, got %v", *c.BudgetVal)
+				}
+			} else {
+				if c.BudgetVal == nil {
+					t.Fatal("expected non-nil BudgetVal")
+				}
+				if *c.BudgetVal != tt.wantValue {
+					t.Errorf("expected %.2f, got %.2f", tt.wantValue, *c.BudgetVal)
+				}
+			}
+		})
+	}
+}