Roll Observatory packages and add a roll script

packages/when/test/test_when.dart

+
+library when.test;
+
+import 'dart:async';
+
+import 'package:unittest/unittest.dart';
+import 'package:when/when.dart';
+
+main() {
+  group('when', () {
+
+    test('on non-Future callback result should call onSuccess with result, then onComplete, and return onSuccess result', () {
+      var onSuccessCalled = false;
+      var onErrorCalled = false;
+      var onCompleteCalled = false;
+      var ret = when(
+          () => 5,
+          onSuccess: (x) {
+            expect(x, 5);
+            onSuccessCalled = true;
+            return 10;
+          },
+          onError: (e) => onErrorCalled = true,
+          onComplete: () {
+            expect(onSuccessCalled, isTrue);
+            onCompleteCalled = true;
+          });
+      expect(onErrorCalled, isFalse);
+      expect(onCompleteCalled, isTrue);
+      expect(ret, 10);
+    });
+
+    test('on callback failure should call onError with error, then onComplete', () {
+      var onSuccessCalled = false;
+      var onErrorCalled = false;
+      var onCompleteCalled = false;
+      var ret = when(
+          () => throw 'e',
+          onSuccess: (_) => onSuccessCalled = true,
+          onError: (e) {
+            expect(e, 'e');
+            onErrorCalled = true;
+          },
+          onComplete: () {
+            expect(onErrorCalled, isTrue);
+            onCompleteCalled = true;
+          });
+      expect(onSuccessCalled, isFalse);
+      expect(onCompleteCalled, isTrue);
+      expect(ret, isNull);
+    });
+
+    test('should pass stack trace to onError if binary', () {
+      var onErrorCalled = false;
+      when(
+          () => throw 'e',
+          onError: (e, s) {
+            onErrorCalled = true;
+            expect(s, isNotNull);
+          });
+      expect(onErrorCalled, isTrue);
+    });
+
+    test('should throw callback error if no onError provided', () {
+      try {
+        when(
+            () => throw 'e');
+        fail('callback error was swallowed');
+      } catch (e) {
+        expect(e, 'e');
+      }
+    });
+
+    test('should just return callback result if onSuccess not provided', () {
+        expect(when(() => 5), 5);
+    });
+
+    test('should not swallow onComplete error', () {
+      try {
+        when(
+            () {},
+            onComplete: () => throw 'e');
+        fail('onComplete error was swallowed');
+      } catch (e) {
+        expect(e, 'e');
+      }
+    });
+
+    group('on Future callback result', () {
+
+      test('which succeeds should call onSuccess with result, then onComplete, and complete with onSuccess result', () {
+        var onSuccessCalled = false;
+        var onErrorCalled = false;
+        var onCompleteCalled = false;
+        var result = when(
+            () => new Future.value(5),
+            onSuccess: (x) {
+              expect(x, 5);
+              onSuccessCalled = true;
+              return 10;
+            },
+            onError: (e) => onErrorCalled = true,
+            onComplete: () {
+              expect(onSuccessCalled, isTrue);
+              onCompleteCalled = true;
+            });
+        expect(onSuccessCalled, isFalse);
+        expect(onCompleteCalled, isFalse);
+        expect(result, new isInstanceOf<Future>());
+        return result.then((ret) {
+          expect(onErrorCalled, isFalse);
+          expect(onCompleteCalled, isTrue);
+          expect(ret, 10);
+        });
+      });
+
+      test('which fails should call onError with error, then onComplete', () {
+        var onSuccessCalled = false;
+        var onErrorCalled = false;
+        var onCompleteCalled = false;
+        var result = when(
+            () => new Future.error('e'),
+            onSuccess: (_) => onSuccessCalled = true,
+            onError: (e) {
+              expect(e, 'e');
+              onErrorCalled = true;
+            },
+            onComplete: () {
+              onErrorCalled = true;
+              onCompleteCalled = true;
+            });
+        expect(onErrorCalled, isFalse);
+        expect(onCompleteCalled, isFalse);
+        expect(result, new isInstanceOf<Future>());
+        return result.then((ret) {
+          expect(ret, isNull);
+          expect(onSuccessCalled, isFalse);
+          expect(onCompleteCalled, isTrue);
+        });
+      });
+
+      test('should pass stack trace to onError if binary', () {
+        var onErrorCalled = false;
+        return when(
+            () => new Future.error('e'),
+            onError: (e, s) {
+              onErrorCalled = true;
+              // TODO: Why is the stack trace null?
+              // expect(s, isNotNull);
+        }).then((_) {
+          expect(onErrorCalled, isTrue);
+        });
+      });
+
+      test('should throw callback error if no onError provided', () {
+        return when(
+            () => new Future.error('e')
+        ).then((_) {
+          fail('callback error was swallowed');
+        }, onError: (e) {
+          expect(e, 'e');
+        });
+      });
+
+      test('should just return callback result if onSuccess not provided', () {
+        return when(() => new Future.value(5)).then((result) {
+          expect(result, 5);
+        });
+      });
+
+      test('should not swallow onComplete error', () {
+        return when(
+            () => new Future.value(),
+            onComplete: () => throw 'e')
+            .then((ret) {
+              fail('onComplete error was swallowed');
+            }, onError: (e) {
+              expect(e, 'e');
+            });
+      });
+
+    });
+  });
+}