first commit

packages/nodes-base/nodes/Transform/SplitOut/test/utils.test.ts

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+import { FieldsTracker } from '../utils';
+
+describe('FieldsTracker', () => {
+	let fieldsTracker: FieldsTracker;
+
+	beforeEach(() => {
+		fieldsTracker = new FieldsTracker();
+	});
+
+	describe('add', () => {
+		it('should add field with false value', () => {
+			fieldsTracker.add('testField');
+
+			expect(fieldsTracker.fields.testField).toBe(false);
+		});
+
+		it('should not overwrite existing field', () => {
+			fieldsTracker.add('testField');
+			fieldsTracker.fields.testField = true;
+			fieldsTracker.add('testField');
+
+			expect(fieldsTracker.fields.testField).toBe(true);
+		});
+	});
+
+	describe('update', () => {
+		it('should update field from false to true', () => {
+			fieldsTracker.add('testField');
+			fieldsTracker.update('testField', true);
+
+			expect(fieldsTracker.fields.testField).toBe(true);
+		});
+
+		it('should not update field from true to false', () => {
+			fieldsTracker.add('testField');
+			fieldsTracker.fields.testField = true;
+			fieldsTracker.update('testField', false);
+
+			expect(fieldsTracker.fields.testField).toBe(true);
+		});
+	});
+
+	describe('getHints', () => {
+		it('should return empty array when no fields tracked', () => {
+			expect(fieldsTracker.getHints()).toEqual([]);
+		});
+
+		it('should return hint for missing field', () => {
+			fieldsTracker.add('missingField');
+
+			const hints = fieldsTracker.getHints();
+
+			expect(hints).toEqual([
+				{
+					message: "The field 'missingField' wasn't found in any input item",
+					location: 'outputPane',
+				},
+			]);
+		});
+
+		it('should not return hint for found field', () => {
+			fieldsTracker.add('foundField');
+			fieldsTracker.update('foundField', true);
+
+			expect(fieldsTracker.getHints()).toEqual([]);
+		});
+	});
+});