Tests: Add missing tests to improve coverage

Author: snatalenko

tests/unit/mergeSchema.test.ts

@@ -0,0 +1,37 @@
+import { expect } from 'chai';
+import type { JSONSchema4 } from 'json-schema';
+import mergeSchema from '../../src/utils/mergeSchema.ts';
+
+describe('mergeSchema', () => {
+
+	it('merges array properties and keeps only unique values', () => {
+
+		const dest: JSONSchema4 = {
+			type: 'object',
+			required: ['id', 'name']
+		};
+
+		const src: JSONSchema4 = {
+			required: ['name', 'email']
+		};
+
+		const result = mergeSchema(dest, src);
+
+		expect(result.required).to.eql(['id', 'name', 'email']);
+	});
+
+	it('deduplicates structurally equal array entries', () => {
+
+		const dest: JSONSchema4 = {
+			enum: [{ code: 'A' }, { code: 'A' }] as any[]
+		};
+
+		const src: JSONSchema4 = {
+			enum: [{ code: 'A' }, { code: 'B' }] as any[]
+		};
+
+		const result = mergeSchema(dest, src);
+
+		expect(result.enum).to.eql([{ code: 'A' }, { code: 'B' }]);
+	});
+});