test: lazy validator basic tests (jquense#366)

test/lazy.js

@@ -0,0 +1,30 @@
+import { lazy, mixed } from '../src';
+
+describe('lazy', function() {
+  it('should throw on a non-schema value', () => {
+    (() => lazy(() => undefined).validate()).should.throw();
+  });
+
+  describe('mapper', () => {
+    const value = 1;
+    let mapper;
+
+    beforeEach(() => {
+      mapper = sinon.stub();
+      mapper.returns(mixed());
+    });
+
+    it('should call with value', () => {
+      lazy(mapper).validate(value);
+      mapper.should.have.been.calledWith(value);
+    });
+
+    it('should call with context', () => {
+      const context = {
+        a: 1,
+      };
+      lazy(mapper).validate(value, context);
+      mapper.should.have.been.calledWithExactly(value, context);
+    });
+  });
+});