Improve test coverage of reflective invocation.

tests/lib/mirrors/invoke_test.dart

+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library test.invoke_test;
+
+import 'dart:mirrors';
+
+import 'package:expect/expect.dart';
+import '../../async_helper.dart';
+
+class C {
+        var field;

[ahe, 2013/07/20 16:34:59]

Weird indentation.

[rmacnak, 2013/07/22 18:40:48]

Oops, Sublime normally converts my tabs to spaces. My guess is it didn't know
which rule to use initially because this was a new file.

+        C() : this.field = 'default';
+        C.named(this.field);
+
+        get getter => 'get $field';
+        set setter(v) => field = 'set $v';
+        method(x, y, z) => '$x+$y+$z';
+        toString() => 'a C';
+
+        noSuchMethod(invocation) => 'DNU';
+
+        static var staticField = 'initial';
+        static get staticGetter => 'sget $staticField';
+        static set staticSetter(v) => staticField = 'sset $v';
+        static staticFunction(x, y) => "($x,$y)";
+}
+
+var libraryField = 'a priori';
+get libraryGetter => 'lget $libraryField';
+set librarySetter(v) => libraryField = 'lset $v';
+libraryFunction(x,y) => '$x$y';
+
+testSync() {
+  var result;
+
+  // InstanceMirror invoke
+  C c = new C();
+  InstanceMirror im = reflect(c);
+  result = im.invoke(const Symbol('method'), [2,4,8]);
+  Expect.equals('2+4+8', result.reflectee);
+  result = im.invoke(const Symbol('doesntExist'), [2,4,8]);
+  Expect.equals('DNU', result.reflectee);
+  result = im.invoke(const Symbol('method'), [2,4]);  // Wrong arity.
+  Expect.equals('DNU', result.reflectee);
+
+  // InstanceMirror invokeGetter
+  result = im.getField(const Symbol('getter'));
+  Expect.equals('get default', result.reflectee);
+  result = im.getField(const Symbol('field'));
+  Expect.equals('default', result.reflectee);
+  result = im.getField(const Symbol('doesntExist'));
+  Expect.equals('DNU', result.reflectee);
+
+  // InstanceMirror invokeSetter
+  im.setField(const Symbol('setter'), 'foo');
+  Expect.equals('set foo', c.field);
+  im.setField(const Symbol('field'), 'bar');
+  Expect.equals('bar', c.field);
+  im.setField(const Symbol('doesntExist'), 'bar');
+  // Expect does not throw.

[ahe, 2013/07/20 16:34:59]

What does this mean?

[rmacnak, 2013/07/22 18:40:48]

We expect setField(#doesntExist) to complete without raising an exception. It
produces no side-effect and the return value of setField is ill-defined.

[ahe, 2013/07/22 19:29:49]

Please add the comment *above* the line to which it applies.  Also, write a
complete sentence.

The return value of setField is defined to be the an instance mirror on the
second argument. This is what the language specification says.

[rmacnak, 2013/07/22 20:16:56]

Done.
Currently the VM will give an instance mirror on the result of the setter, which
isn't necessarily the setter's argument.  I will address this in another CL.

+
+  // ClassMirror invoke
+  ClassMirror cm = reflectClass(C);
+  result = cm.invoke(const Symbol('staticFunction'),[3,4]);
+  Expect.equals('(3,4)', result.reflectee);
+  try {
+        result = cm.invoke(const Symbol('doesntExist'),[3,4]);

[ahe, 2013/07/20 16:34:59]

Weird indentation.

+    Expect.fail('Should not reach');
+  } catch(exception) {}

[ahe, 2013/07/20 16:34:59]

This doesn't work.  Also, NEVER have an empty catch block, at least write a
comment about why it is appropriate to ignore the error.

Take a look at Expect.throws.

[rmacnak, 2013/07/22 18:40:48]

This works on the VM.  In any case, converted to Expect.throws.

[ahe, 2013/07/22 19:29:49]

What I meant is: You could do absolutely anything in the try block (as long as
it isn't a compile-time error). If an error is thrown the test "pass", if no
error is thrown the test "pass".

[rmacnak, 2013/07/22 20:16:56]

Ah, you mean it doesn't properly assert both control flows. Now I see.

+  try {
+        result = cm.invoke(const Symbol('staticFunction'),[3]);  // Wrong arity.

[ahe, 2013/07/20 16:34:59]

Weird indention.

+    Expect.fail('Should not reach');
+  } catch(exception) {}

[ahe, 2013/07/20 16:34:59]

This doesn't work.

+
+  // ClassMirror invokeGetter

[ahe, 2013/07/20 16:34:59]

Seem to be a systemic problem below:

Weird indentation and bad tests of exceptions.

+  result = cm.getField(const Symbol('staticGetter'));
+  Expect.equals('sget initial', result.reflectee);
+  result = cm.getField(const Symbol('staticField'));
+  Expect.equals('initial', result.reflectee);
+  try {
+        result = cm.getField(const Symbol('doesntExist'));
+    Expect.fail('Should not reach');
+  } catch(exception) {}
+
+  // ClassMirror invokeSetter
+  cm.setField(const Symbol('staticSetter'), 'sfoo');
+  Expect.equals('sset sfoo', C.staticField);
+  cm.setField(const Symbol('staticField'), 'sbar');
+  Expect.equals('sbar', C.staticField);
+  try {
+        result = cm.setField(const Symbol('doesntExist'), 'sbar');
+    Expect.fail('Should not reach');
+  } catch(exception) {}
+
+  // ClassMirror invokeConstructor
+  result = cm.newInstance(const Symbol(''), []);
+  Expect.isTrue(result.reflectee is C);
+  Expect.equals('default', result.reflectee.field);
+  result = cm.newInstance(const Symbol('named'), ['my value']);
+  Expect.isTrue(result.reflectee is C);
+  Expect.equals('my value', result.reflectee.field);
+  try {
+        result = cm.newInstance(const Symbol('doesntExist'), ['my value']);
+    Expect.fail('Should not reach');
+  } catch(exception) {}
+  try {
+        result = cm.newInstance(const Symbol('named'), []);  // Wrong arity.
+    Expect.fail('Should not reach');
+  } catch(exception) {}
+
+  // LibraryMirror invoke
+  LibraryMirror lm = cm.owner;
+  result = lm.invoke(const Symbol('libraryFunction'),[':',')']);
+  Expect.equals(':)', result.reflectee);
+  try {
+        result = lm.invoke(const Symbol('doesntExist'), [':',')']);
+    Expect.fail('Should not reach');
+  } catch(exception) {}
+  try {
+        result = lm.invoke(const Symbol('libraryFunction'), [':']);  // Wrong arity.
+    Expect.fail('Should not reach');
+  } catch(exception) {}
+
+  // LibraryMirror invokeGetter
+  result = lm.getField(const Symbol('libraryGetter'));
+  Expect.equals('lget a priori', result.reflectee);
+  result = lm.getField(const Symbol('libraryField'));
+  Expect.equals('a priori', result.reflectee);
+  try {
+        result = lm.getField(const Symbol('doesntExist'));
+    Expect.fail('Should not reach');
+  } catch(exception) {}
+
+  // LibraryMirror invokeSetter
+  lm.setField(const Symbol('librarySetter'), 'lfoo');
+  Expect.equals('lset lfoo', libraryField);
+  lm.setField(const Symbol('libraryField'), 'lbar');
+  Expect.equals('lbar', libraryField);
+  try {
+        result = lm.setField(const Symbol('doesntExist'), 'lbar');
+    Expect.fail('Should not reach');
+  } catch(exception) {}
+}
+
+testAsync() {
+  var future;
+
+  // InstanceMirror invoke
+  C c = new C();
+  InstanceMirror im = reflect(c);
+  future = im.invokeAsync(const Symbol('method'), [2,4,8]);
+  asyncStart();
+  future.then((result) {
+        Expect.equals('2+4+8', result.reflectee);
+        asyncEnd();
+  });
+  future = im.invokeAsync(const Symbol('method'), [im,im,im]);
+  asyncStart();
+  future.then((result) {
+        Expect.equals('a C+a C+a C', result.reflectee);
+        asyncEnd();
+  });
+  future = im.invokeAsync(const Symbol('doesntExist'), [2,4,8]);
+  asyncStart();
+  future.then((result) {
+        Expect.equals('DNU', result.reflectee);
+        asyncEnd();
+  });
+  future = im.invokeAsync(const Symbol('method'), [2, 4]);  // Wrong arity.
+  asyncStart();
+  future.then((result) {
+        Expect.equals('DNU', result.reflectee);
+        asyncEnd();
+  });
+
+  // InstanceMirror invokeGetter
+  future = im.getFieldAsync(const Symbol('getter'));
+  asyncStart();
+  future.then((result) {
+        Expect.equals('get default', result.reflectee);
+        asyncEnd();
+  });
+  future = im.getFieldAsync(const Symbol('field'));
+  asyncStart();
+  future.then((result) {
+    Expect.equals('default', result.reflectee);
+        asyncEnd();
+  });
+  future = im.getFieldAsync(const Symbol('doesntExist'));
+  asyncStart();
+  future.then((result) {
+    Expect.equals('DNU', result.reflectee);
+        asyncEnd();
+  });
+
+  // InstanceMirror invokeSetter
+  future = im.setFieldAsync(const Symbol('setter'), 'foo');
+  asyncStart();
+  future.then((result) {
+        Expect.equals('set foo', c.field);
+        asyncEnd();
+    var future2 = im.setFieldAsync(const Symbol('field'), 'bar');
+    asyncStart();
+    future2.then((result) {
+        Expect.equals('bar', c.field);
+            asyncEnd();
+        var future3 = im.setFieldAsync(const Symbol('field'), im);
+        asyncStart();
+        future3.then((result) {
+           Expect.equals(c, c.field);
+               asyncEnd();
+        });
+    });
+  });
+  future = im.setFieldAsync(const Symbol('doesntExist'), 'bar');
+  asyncStart();
+  future.then((result) {
+        asyncEnd();
+  }, onError:(exception) {
+    Expect.fail('Should not throw');
+  });
+
+
+  // ClassMirror invoke
+  ClassMirror cm = reflectClass(C);
+  future = cm.invokeAsync(const Symbol('staticFunction'),[3,4]);
+  asyncStart();
+  future.then((result) {
+        Expect.equals('(3,4)', result.reflectee);
+        asyncEnd();
+  });
+  future = cm.invokeAsync(const Symbol('staticFunction'),[im,im]);
+  asyncStart();
+  future.then((result) {
+        Expect.equals('(a C,a C)', result.reflectee);
+        asyncEnd();
+  });
+  future = cm.invokeAsync(const Symbol('doesntExist'),[im,im]);
+  asyncStart();
+  future.then((result) {
+        Expect.fail('Should not reach');
+  }, onError:(exception){
+        asyncEnd();
+  });
+  future = cm.invokeAsync(const Symbol('staticFunction'),[3]);  //Wrong arity.
+  asyncStart();
+  future.then((result) {
+        Expect.fail('Should not reach');
+  }, onError:(exception){
+        asyncEnd();
+  });
+
+  // ClassMirror invokeGetter
+  C.staticField = 'initial'; // Reset from synchronous test.
+  future = cm.getFieldAsync(const Symbol('staticGetter'));
+  asyncStart();
+  future.then((result) {
+        Expect.equals('sget initial', result.reflectee);
+        asyncEnd();
+  });
+  future = cm.getFieldAsync(const Symbol('staticField'));
+  asyncStart();
+  future.then((result) {
+    Expect.equals('initial', result.reflectee);
+        asyncEnd();
+  });
+  future = cm.getFieldAsync(const Symbol('doesntExist'));
+  asyncStart();
+  future.then((result) {
+        Expect.fail('Should not reach');
+  }, onError:(exception){
+        asyncEnd();
+  });
+
+  // ClassMirror invokeSetter
+  future = cm.setFieldAsync(const Symbol('staticSetter'), 'sfoo');
+  asyncStart();
+  future.then((result) {
+        Expect.equals('sset sfoo', C.staticField);
+        asyncEnd();
+    var future2 = cm.setFieldAsync(const Symbol('staticField'), 'sbar');
+    asyncStart();
+    future2.then((result) {
+      Expect.equals('sbar', C.staticField);
+          asyncEnd();
+      var future3 = cm.setFieldAsync(const Symbol('staticField'), im);
+      asyncStart();
+      future3.then((result) {
+        Expect.equals(c, C.staticField);
+            asyncEnd();
+      });
+    });
+  });
+  future = cm.setFieldAsync(const Symbol('doesntExist'), 'sbar');
+  asyncStart();
+  future.then((result) {
+        Expect.fail('Should not reach');
+  }, onError:(exception){
+        asyncEnd();
+  });
+
+  // ClassMirror invokeConstructor
+  future = cm.newInstanceAsync(const Symbol(''), []);
+  asyncStart();
+  future.then((result) {
+        Expect.isTrue(result.reflectee is C);
+    Expect.equals('default', result.reflectee.field);
+        asyncEnd();
+  });
+  future = cm.newInstanceAsync(const Symbol('named'), ['my value']);
+  asyncStart();
+  future.then((result) {
+        Expect.isTrue(result.reflectee is C);
+    Expect.equals('my value', result.reflectee.field);
+        asyncEnd();
+  });
+  future = cm.newInstanceAsync(const Symbol('named'), [im]);
+  asyncStart();
+  future.then((result) {
+        Expect.isTrue(result.reflectee is C);
+    Expect.equals(c, result.reflectee.field);
+        asyncEnd();
+  });
+  future = cm.newInstanceAsync(const Symbol('doesntExist'), ['my value']);
+  asyncStart();
+  future.then((result) {
+        Expect.fail('Should not reach');
+  }, onError:(exception){
+        asyncEnd();
+  });
+  future = cm.newInstanceAsync(const Symbol('named'), []);  // Wrong arity.
+  asyncStart();
+  future.then((result) {
+        Expect.fail('Should not reach');
+  }, onError:(exception){
+        asyncEnd();
+  });
+
+  // LibraryMirror invoke
+  LibraryMirror lm = cm.owner;
+  future = lm.invokeAsync(const Symbol('libraryFunction'),[':',')']);
+  asyncStart();
+  future.then((result) {
+    Expect.equals(':)', result.reflectee);
+        asyncEnd();
+  });
+  future = lm.invokeAsync(const Symbol('libraryFunction'),[im,im]);
+  asyncStart();
+  future.then((result) {
+    Expect.equals('a Ca C', result.reflectee);
+        asyncEnd();
+  });
+  future = lm.invokeAsync(const Symbol('doesntExist'),[im,im]);
+  asyncStart();
+  future.then((result) {
+        Expect.fail('Should not reach');
+  }, onError:(exception){
+        asyncEnd();
+  });
+  future = lm.invokeAsync(const Symbol('libraryFunction'),[':']);  // Wrong arity.
+  asyncStart();
+  future.then((result) {
+        Expect.fail('Should not reach');
+  }, onError:(exception){
+        asyncEnd();
+  });
+
+  // LibraryMirror invokeGetter
+  libraryField = 'a priori'; // Reset from synchronous test.
+  future = lm.getFieldAsync(const Symbol('libraryGetter'));
+  asyncStart();
+  future.then((result) {
+    Expect.equals('lget a priori', result.reflectee);
+        asyncEnd();
+  });
+  future = lm.getFieldAsync(const Symbol('libraryField'));
+  asyncStart();
+  future.then((result) {
+        Expect.equals('a priori', result.reflectee);
+        asyncEnd();
+  });
+  future = lm.getFieldAsync(const Symbol('doesntExist'));
+  asyncStart();
+  future.then((result) {
+        Expect.fail('Should not reach');
+  }, onError:(exception){
+        asyncEnd();
+  });
+
+  // LibraryMirror invokeSetter
+  future = lm.setFieldAsync(const Symbol('librarySetter'), 'lfoo');
+  asyncStart();
+  future.then((result) {
+        Expect.equals('lset lfoo', libraryField);
+        asyncEnd();
+    var future2 = lm.setFieldAsync(const Symbol('libraryField'), 'lbar');
+    asyncStart();
+    future2.then((result) {
+          Expect.equals('lbar', libraryField);
+          asyncEnd();
+          var future3 = lm.setFieldAsync(const Symbol('libraryField'), im);
+      asyncStart();
+      future3.then((result) {
+            Expect.equals(c, libraryField);
+            asyncEnd();
+          });
+        });
+  });
+  future = lm.setFieldAsync(const Symbol('doesntExist'), 'lbar');
+  asyncStart();
+  future.then((result) {
+        Expect.fail('Should not reach');
+  }, onError:(exception){
+        asyncEnd();
+  });
+}
+
+main() {
+  testSync();
+  asyncStart();
+  testAsync();
+  asyncEnd();
+}