feat(exception_handler): change ExceptionHandler to output context

modules/angular2/test/core/exception_handler_spec.ts

@@ -0,0 +1,90 @@
+import {
+  AsyncTestCompleter,
+  beforeEach,
+  ddescribe,
+  describe,
+  expect,
+  iit,
+  inject,
+  it,
+  xdescribe,
+  xit,
+  IS_DARTIUM,
+  Log
+} from 'angular2/test_lib';
+import {BaseException} from 'angular2/src/facade/lang';
+import {ExceptionHandler} from 'angular2/src/core/exception_handler';
+
+class _CustomException {
+  context = "some context";
+}
+
+export function main() {
+  describe('ExceptionHandler', () => {
+    var log, handler;
+
+    beforeEach(() => {
+      log = new Log();
+      handler = new ExceptionHandler();
+      handler.logError = (e) => log.add(e);
+    });
+
+    it("should output exception", () => {
+      try {
+        handler.call(new BaseException("message!"));
+      } catch (e) {
+      }
+      expect(log.result()).toContain("message!");
+    });
+
+    it("should output stackTrace", () => {
+      try {
+        handler.call(new BaseException("message!"), "stack!");
+      } catch (e) {
+      }
+      expect(log.result()).toContain("stack!");
+    });
+
+    it("should join a long stackTrace", () => {
+      try {
+        handler.call(new BaseException("message!"), ["stack1", "stack2"]);
+      } catch (e) {
+      }
+      expect(log.result()).toContain("stack1");
+      expect(log.result()).toContain("stack2");
+    });
+
+    it("should output reason when present", () => {
+      try {
+        handler.call(new BaseException("message!"), null, "reason!");
+      } catch (e) {
+      }
+      expect(log.result()).toContain("reason!");
+    });
+
+    it("should print context", () => {
+      try {
+        handler.call(new BaseException("message!", null, null, "context!"));
+      } catch (e) {
+      }
+      expect(log.result()).toContain("context!");
+    });
+
+    it("should print nested context", () => {
+      try {
+        var original = new BaseException("message!", null, null, "context!");
+        handler.call(new BaseException("message", original));
+      } catch (e) {
+      }
+      expect(log.result()).toContain("context!");
+    });
+
+    it("should not print context when the passed-in exception is not a BaseException", () => {
+      try {
+        handler.call(new _CustomException());
+      } catch (e) {
+      }
+      expect(log.result()).not.toContain("context");
+    });
+  });
+}