test(validation): added tests for creating custom constraints.

Author: aahoogendoorn

test/validation/Constraints.test.ts

@@ -1,6 +1,25 @@
-import { days, defined, future, gt, gte, includes, inList, lt, lte, past, Struct, required, valid, validate, notEmpty } from '../../src';
+import {
+  constraint,
+  days,
+  defined,
+  future,
+  gt,
+  gte,
+  includes,
+  inList,
+  isValue,
+  lt,
+  lte,
+  notEmpty,
+  past,
+  required,
+  Struct,
+  Text,
+  valid,
+  validate,
+} from '../../src';
 import '@thisisagile/easy-test';
-import { Language } from '../ref';
+import { Age, Language } from '../ref';
 
 describe('Constraints', () => {
   class Tester extends Struct {
@@ -19,7 +38,15 @@ describe('Constraints', () => {
   }
 
   test('All constraints succeed.', () => {
-    const t = new Tester({ first: 'Sander', one: 6, two: 6, past: days.yesterday(), future: days.tomorrow(), language: 'java', title: 'Prof.' });
+    const t = new Tester({
+      first: 'Sander',
+      one: 6,
+      two: 6,
+      past: days.yesterday(),
+      future: days.tomorrow(),
+      language: 'java',
+      title: 'Prof.',
+    });
     const r = validate(t);
     expect(r).toBeValid();
   });
@@ -30,3 +57,29 @@ describe('Constraints', () => {
     expect(r).not.toBeValid();
   });
 });
+
+const is42 = (message?: Text): PropertyDecorator => constraint(v => v === 42, message ?? 'Property {property} should have value \'42\' instead of \'{actual}\'.');
+
+class Person extends Struct {
+  @valid() readonly age: Age = new Age(this.state.age);
+  @is42() readonly realAge: number = this.state.age;
+}
+
+describe('Custom constraints', () => {
+
+  test('test age', () => {
+    expect(isValue(new Age(42))).toBeTruthy();
+    expect(validate(new Age(42))).toBeValid();
+    expect(validate(new Age(142))).not.toBeValid();
+  });
+
+  test('test person', () => {
+    expect(validate(new Person({ age: 42 }))).toBeValid();
+    expect(validate(new Person({ age: 142 }))).not.toBeValid();
+  });
+
+  test('test custom validation', () => {
+    const res = validate(new Person({ age: 142 }));
+    expect(res.results).toHaveLength(2);
+  });
+});