test: improve CEL validator coverage

test/unit/cel_test.go

@@ -1,6 +1,7 @@
 package unit
 
 import (
+	"errors"
 	"testing"
 
 	"github.com/sivchari/govalid/test"
@@ -52,6 +53,46 @@ func TestCELValidation(t *testing.T) {
 			},
 			expectError: false,
 		},
+		{
+			name: "age below minimum",
+			data: test.CEL{
+				Age:      17,
+				Name:     "John",
+				Score:    50.0,
+				IsActive: true,
+			},
+			expectError: true,
+		},
+		{
+			name: "age at minimum boundary",
+			data: test.CEL{
+				Age:      18,
+				Name:     "John",
+				Score:    50.0,
+				IsActive: true,
+			},
+			expectError: false,
+		},
+		{
+			name: "empty name",
+			data: test.CEL{
+				Age:      25,
+				Name:     "",
+				Score:    50.0,
+				IsActive: true,
+			},
+			expectError: true,
+		},
+		{
+			name: "is_active false",
+			data: test.CEL{
+				Age:      25,
+				Name:     "John",
+				Score:    50.0,
+				IsActive: false,
+			},
+			expectError: true,
+		},
 	}
 
 	for _, tt := range tests {
@@ -75,6 +116,17 @@ func TestCELValidation(t *testing.T) {
 	}
 }
 
+func TestCELValidationNil(t *testing.T) {
+	// Test with nil pointer
+	err := test.ValidateCEL(nil)
+	if err == nil {
+		t.Error("expected error for nil CEL, got nil")
+	}
+	if !errors.Is(err, test.ErrNilCEL) {
+		t.Errorf("expected 'input CEL is nil', got %v", err.Error())
+	}
+}
+
 func TestCELCrossFieldValidation(t *testing.T) {
 	tests := []struct {
 		name        string