refactor: vastly simplify guinness2 by removing all context.

Almost everything that guinness does to keep track of suites
and tests is now also handles by package test. So, instead
of keeping tons of complex logic around, simply defer
to package:test functions when possible.

BREAKING CHANGE:

`iit` and `ddescribe` NO LONGER modify which tests will run. Instead,
they will mark those blocks with the tag "solo". To run only
`iit` or `ddescribe` blocks, use the command line
`pub run test --tags solo` (the same command you would use before,
with the additional tags "solo").

See #1

README.md

@@ -7,7 +7,7 @@ Guinness2 is a port of the Jasmine library to Dart. It is based on the AngularDa
 Backed by `dart:test` instead of `dart:unittest`. Run via `pub run test` instead of a Karma setup.
 
 Removed bits referring to 'runner' programatically - just use `pub run test`. Removed deprecated
-showStats option.
+showStats option. Remove all context-keeping, as this is now handles by package:test directly.
 
 ## Installation
 
@@ -41,7 +41,7 @@ Guinness specs are comprised of `describe`, `it`, `beforeEach`, and `afterEach`
 ```dart
 import 'package:guinness2/guinness2.dart';
 
-main(){
+main() {
   describe("syntax", () {
     beforeEach(() {
       print("outer before");
@@ -81,8 +81,7 @@ This will print:
 * To exclude an `it`, change it to `xit`.
 * To make a `describe` exclusive, change it to `ddescribe`.
 * To make an `it` exclusive, change it to `iit`.
-
-If there is an `iit` in your spec files, Guinness will run only `iit`s. In this case `ddescribe`s will be ignored.
+* *Important:* to run exclusive tests, add `--tags solo` to your command line invocation.
 
 
 ### Pending Specs
@@ -92,11 +91,9 @@ Guinness supports pending describe and it blocks (blocks without a callback).
 ```dart
 describe("pending describe");
 xdescribe("pending xdescribe");
-ddescribe("pending ddescribe");
 
 it("pending it");
 xit("pending xit");
-iit("pending iit");
 ```
 
 ## Async
@@ -264,29 +261,13 @@ expect(s.invoke(1,2)).toEqual(3);
 
 You can also use the `mock` and `dart_mocks` libraries with it.
 
-## Status
-
-There are a few things that are still not supported (e.g., handling named parameters in expectations).
 
 ## Implementation Details
 
 ### Key Ideas
 
-The main idea is to treat the Jasmine syntax as a domain specific language. Therefore,
-the implementation clearly  separates such things as: syntax, semantic model, and execution model. Let's quickly look
-  at the benefits this approach provides:
-
-#### The semantic model is separate from the syntax.
-
-The semantic model consists of It, Describe, Suite, BeforeEach, and AfterEach objects. You can create and analyse
-them  without using the context-dependent nested Jasmine syntax.
-
-#### The parsing of specs is separate from the execution of specs.
-
-The library builds a tree of the It, Describe, Suite, BeforeEach, and AfterEach objects first. And after that,
-as a  separate step, executes them. It enables all sorts of preprocessing (e.g., filtering, reordering).
-
-#### Pluggable backends.
+Dart's `package:test` supports most of the original Guinness test organization natively,
+so we simply forward to the appropriate `package:test` function. 
 
-Since the library is a DSL, there can be multiple backend libraries actually executing the specs. By default,
-the  library comes with the test backend.
+The large exception is expectations, matchers, and spies, which are unchanged
+from original Guinness.

example/example.dart

@@ -8,7 +8,7 @@ import 'dart:html';
 class TestClass {}
 
 main() {
-  GuinnessEnableHtmlMatchers();
+  guinnessEnableHtmlMatchers();
 
   describe("guinness2", () {
     it("has various built-in matchers", () {

lib/guinness2.dart

@@ -8,22 +8,17 @@ import 'dart:math' as math;
 
 export 'package:test/test.dart' show TestOn;
 
-part 'src/common/model.dart';
-part 'src/common/context.dart';
 part 'src/common/syntax.dart';
 part 'src/common/expect.dart';
 part 'src/common/spy.dart';
 part 'src/common/interfaces.dart';
 part 'src/common/guinness_config.dart';
 part 'src/common/test_backend.dart';
-part 'src/common/exclusive_visitor.dart';
-part 'src/common/suite_info.dart';
 
 class _Undefined {
   const _Undefined();
 }
 const _u = const _Undefined();
 
 final Guinness guinness = new Guinness(
-    matchers: new TestMatchers(),
-    initSpecs: testInitSpecs);
+    matchers: new TestMatchers());

lib/src/common/guinness_config.dart

@@ -1,35 +1,14 @@
 part of guinness2;
 
 class Guinness {
-  Context _context = new Context();
   dynamic matchers;
-  SpecRunner _initSpecs;
-  bool autoInit = true;
 
-  Guinness({this.matchers, SpecRunner initSpecs})
-      : _initSpecs = initSpecs {
-    _scheduleAutoInit();
+  Guinness({this.matchers}) {
   }
 
   SpyFunction createSpy([String name]) => new SpyFunction(name);
 
   SpyFunction spyOn(obj, String name) {
     throw "Not implemented";
   }
-
-  void initSpecs() {
-    _initSpecs(_context.suite);
-  }
-
-  void resetContext([Context context]) {
-    _context = context == null ? new Context() : context;
-  }
-
-  SuiteInfo suiteInfo() => _suiteInfo(_context.suite);
-
-  void _scheduleAutoInit() {
-    async.scheduleMicrotask(() {
-      if (autoInit) initSpecs();
-    });
-  }
 }

lib/src/common/interfaces.dart

@@ -1,13 +1,5 @@
 part of guinness2;
 
-typedef void SpecRunner(Suite suite);
-
-abstract class SpecVisitor {
-  void visitSuite(Suite suite);
-  void visitDescribe(Describe describe);
-  void visitIt(It it);
-}
-
 abstract class Matchers {
   dynamic get config;