ASP.NET Web PDF Document Viewer/Editor Control Library

When the spy has been created, the actual test is being performed. After the test has been performed, fetch the value for the new column willSignal. If the value is true, a signal is expected. If a signal is expected, verify that the spy has caught exactly one signal. Before you look at how this is done, you must understand that QSignalSpy inherits QList<QList<QVariant> >. This means that it is a list of lists holding variant objects. Check the number of signals caught using the count property. To get the value from the first argument from the signal, use the takeFirst method to get a list of argument values for the signal. The zeroth index of the list returned (that is, the first argument of the signal) is converted from QVariant to an integer using toInt before it is compared with the expected end value. If willSignal tells you that no signal was expected, verify that no signal was emitted. It is easy to forget to check the no-signal case. If you miss it and a signal is emitted without a change, two objects connected to each other will hang in an infinite loop. The changes to the test case data slot are limited to the new column willSignal holding a Boolean telling the test whether a signal is expected or not. Listing 16-21. Testing keyboard interaction now with additional signal-monitoring skills void SpinBoxTest::testKeys() { QSpinBox spinBox; spinBox.setRange( 1, 10 );

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Both HashSet<T> and SortedSet<T> offer various handy set-based methods. You can determine whether an IEnumerable<T> is a subset of (i.e., all its elements are also found in) a set with the IsSubsetOf, for example. The available methods are defined by the common ISet<T> interface, reproduced in Example 9-12.

namespace System.Collections.Generic { public interface ISet<T> : ICollection<T>, IEnumerable<T>, IEnumerable { bool Add(T item); void ExceptWith(IEnumerable<T> other); void IntersectWith(IEnumerable<T> other); bool IsProperSubsetOf(IEnumerable<T> other); bool IsProperSupersetOf(IEnumerable<T> other); bool IsSubsetOf(IEnumerable<T> other); bool IsSupersetOf(IEnumerable<T> other); bool Overlaps(IEnumerable<T> other); bool SetEquals(IEnumerable<T> other); void SymmetricExceptWith(IEnumerable<T> other); void UnionWith(IEnumerable<T> other); } }

Database LINQ providers are able to translate LINQ queries into SQL because their versions of the LINQ operators exploit a feature added to C# 3.0 specifically to support this sort of thing. If you compare the LINQ to Entities declaration of the Where operator with its LINQ to Objects counterpart, you ll see a difference. As we saw in 8, LINQ to Objects is implemented as a set of extension methods for the IEnumera ble<T> interface defined by the Enumerable type in the System.Linq namespace. Its Where operator is declared like this:

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QFETCH( Qt::Key, key ); QFETCH( int, startValue ); spinBox.setValue( startValue ); QSignalSpy spy( &spinBox, SIGNAL(valueChanged(int)) ); QTest::keyClick( &spinBox, key ); QTEST( spinBox.value(), "endValue" ); QFETCH( bool, willSignal ); if( willSignal ) { QCOMPARE( spy.count(), 1 ); QTEST( spy.takeFirst()[0].toInt(), "endValue" ); } else QCOMPARE( spy.count(), 0 ); } void SpinBoxTest::testKeys_data() { QTest::addColumn<Qt::Key>( "key" ); QTest::addColumn<int>( "startValue" ); QTest::addColumn<int>( "endValue" ); QTest::addColumn<bool>( "willSignal" ); QTest::newRow( QTest::newRow( QTest::newRow( QTest::newRow( } The changes to the other two test case slots, testClicks and testSetting, are almost identical to the ones made to testKeys. The biggest change is that testSetting had to be extended with a startValue column and a new test case testing the no-signal case. The changes to the tests are limited to adding a new object. The state of this object is then checked by using the standard macros from the QtTest module. This means that the unit is being built and used in exactly the same way as for tests not checking for signals. "Up" ) << Qt::Key_Up << 5 << 6 << true; "Down" ) << Qt::Key_Down << 5 << 4 << true; "Up, limit" ) << Qt::Key_Up << 10 << 10 << false; "Down, limit" ) << Qt::Key_Down << 1 << 1 << false;

public static IEnumerable<TSource> Where<TSource>( this IEnumerable<TSource> source, Func<TSource, bool> predicate)

LINQ to Entities works in a similar fashion, but the extension methods are all for IQueryable<T>. Since the various properties the object context provides for accessing tables all implement IQueryable<T>, you ll end up using those extension methods instead of the LINQ to Objects ones. They are defined by the Queryable type, again in the System.Linq namespace. Here s its definition of the Where operator:

public static IQueryable<TSource> Where<TSource>( this IQueryable<TSource> source, Expression<Func<TSource, bool>> predicate)