test: 💍 add validation test

Author: streamich

src/constants.ts

@@ -1,3 +1,8 @@
+/**
+ * @module
+ * @todo Move to `src/validator/`.
+ */
+
 /**
  * Validation error codes.
  *

src/type/__tests__/validateTestSuite.ts

@@ -1,4 +1,5 @@
 import {type Type, t} from '..';
+import {ValidationError, ValidationErrorMessage} from '../../constants';
 import {TypeSystem} from '../../system/TypeSystem';
 
 export const validateTestSuite = (validate: (type: Type, value: unknown) => void) => {
@@ -384,6 +385,22 @@ export const validateTestSuite = (validate: (type: Type, value: unknown) => void
       expect(() => validate(type, [1])).toThrowErrorMatchingInlineSnapshot(`"STR"`);
     });
 
+    test('object nested in array', () => {
+      const type = t.obj
+        .prop('foo', t.array(t.obj.prop('bar', t.str)))
+      validate(type, {foo: [{bar: 'baz'}]});
+      const validator = type.validator('object');
+      const res = validator({foo: [{bar: 'baz'}]});
+      expect(res).toBe(null);
+      const res2 = validator({foo: {bar: 'baz'}});
+      expect(res2).toEqual({
+        code: ValidationError[ValidationError.ARR],
+        errno: ValidationError.ARR,
+        message: ValidationErrorMessage[ValidationError.ARR],
+        path: [ 'foo' ]
+      });
+    });
+
     describe('size bounds', () => {
       test('respects min and max', () => {
         const type = t.arr.options({min: 2, max: 4});