Reorganize exceptions and add unit tests

tests/auto/qtpromise/exceptions/exceptions.pro

@@ -0,0 +1,5 @@
+QT += concurrent
+TARGET = tst_exceptions
+SOURCES += $$PWD/tst_exceptions.cpp
+
+include(../qtpromise.pri)

tests/auto/qtpromise/exceptions/tst_exceptions.cpp

@@ -0,0 +1,52 @@
+#include "../shared/utils.h"
+
+// QtPromise
+#include <QtPromise>
+
+// Qt
+#include <QtConcurrent>
+#include <QtTest>
+
+using namespace QtPromise;
+
+class tst_exceptions : public QObject
+{
+    Q_OBJECT
+
+private Q_SLOTS:
+    void canceled();
+    void timeout();
+    void undefined();
+
+}; // class tst_exceptions
+
+QTEST_MAIN(tst_exceptions)
+#include "tst_exceptions.moc"
+
+namespace {
+
+template <class E>
+void verify()
+{
+    auto p = qPromise(QtConcurrent::run([]() { throw E(); }));
+    QCOMPARE(p.isPending(), true);
+    QCOMPARE(waitForRejected<E>(p), true);
+    QCOMPARE(p.isRejected(), true);
+}
+
+} // anonymous namespace
+
+void tst_exceptions::canceled()
+{
+    verify<QPromiseCanceledException>();
+}
+
+void tst_exceptions::timeout()
+{
+    verify<QPromiseTimeoutException>();
+}
+
+void tst_exceptions::undefined()
+{
+    verify<QPromiseUndefinedException>();
+}

tests/auto/qtpromise/qtpromise.pro

@@ -1,6 +1,7 @@
 TEMPLATE = subdirs
 SUBDIRS += \
     benchmark \
+    exceptions \
     future \
     helpers \
     qpromise \