feat(forms): add support for validations

modules/angular2/test/forms/validators_spec.js

@@ -0,0 +1,73 @@
+import {ddescribe, describe, it, iit, xit, expect, beforeEach, afterEach, el} from 'angular2/test_lib';
+import {ControlGroup, Control, required, compose, controlGroupValidator} from 'angular2/forms';
+
+export function main() {
+  function validator(key:string, error:any){
+    return function(c:Control) {
+      var r = {};
+      r[key] = error;
+      return r;
+    }
+  }
+
+  describe("Validators", () => {
+    describe("required", () => {
+      it("should error on an empty string", () => {
+        expect(required(new Control(""))).toEqual({"required" : true});
+      });
+
+      it("should error on null", () => {
+        expect(required(new Control(null))).toEqual({"required" : true});
+      });
+
+      it("should not error on a non-empty string", () => {
+        expect(required(new Control("not empty"))).toEqual(null);
+      });
+    });
+
+    describe("compose", () => {
+      it("should collect errors from all the validators", () => {
+        var c = compose([validator("a", true), validator("b", true)]);
+        expect(c(new Control(""))).toEqual({"a" : true, "b" : true});
+      });
+
+      it("should run validators left to right", () => {
+        var c = compose([validator("a", 1), validator("a", 2)]);
+        expect(c(new Control(""))).toEqual({"a" : 2});
+      });
+    });
+
+    describe("controlGroupValidator", () => {
+      it("should collect errors from the child controls", () => {
+        var g = new ControlGroup({
+          "one" : new Control("one", validator("a", true)),
+          "two" : new Control("two", validator("b", true))
+        });
+
+        expect(controlGroupValidator(g)).toEqual({
+          "one" : {"a" : true},
+          "two" : {"b" : true}
+        });
+      });
+
+      it("should not include keys for controls that have no errors", () => {
+        var g = new ControlGroup({
+          "one" : new Control("one", validator("a", true)),
+          "two" : new Control("one")
+        });
+
+        expect(controlGroupValidator(g)).toEqual({
+          "one" : {"a" : true}
+        });
+      });
+
+      it("should return null when no errors", () => {
+        var g = new ControlGroup({
+          "one" : new Control("one")
+        });
+
+        expect(controlGroupValidator(g)).toEqual(null);
+      });
+    });
+  });
+}