QVarLengthArray: add some basic checks for default-ctor

There seems to have been no-one that checked a simple empty()/isEmpty()...

Pick-to: 6.2 5.15
Change-Id: I7fa567f556532dfa21db759719f1303a768a9732
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

1 files changed, 21 insertions, 0 deletions

diff --git a/tests/auto/corelib/tools/qvarlengtharray/tst_qvarlengtharray.cpp b/tests/auto/corelib/tools/qvarlengtharray/tst_qvarlengtharray.cpp
index 1d30ca3d03..3631f4f977 100644
--- a/tests/auto/corelib/tools/qvarlengtharray/tst_qvarlengtharray.cpp
+++ b/tests/auto/corelib/tools/qvarlengtharray/tst_qvarlengtharray.cpp
@@ -68,6 +68,8 @@ class tst_QVarLengthArray : public QObject
 {
     Q_OBJECT
 private slots:
+    void defaultConstructor_int() { defaultConstructor<int>(); }
+    void defaultConstructor_QString() { defaultConstructor<QString>(); }
     void append();
     void prepend();
     void emplace();
@@ -112,6 +114,8 @@ private slots:
     void erase();
 
 private:
+    template <typename T>
+    void defaultConstructor();
     template <qsizetype N, typename T>
     void move(T t1, T t2);
     template <qsizetype N>
@@ -124,6 +128,23 @@ private:
     void initializeList();
 };
 
+template <typename T>
+void tst_QVarLengthArray::defaultConstructor()
+{
+    {
+        QVarLengthArray<T, 123> vla;
+        QCOMPARE(vla.size(), 0);
+        QVERIFY(vla.empty());
+        QVERIFY(vla.isEmpty());
+        QCOMPARE(vla.begin(), vla.end());
+        QCOMPARE(vla.capacity(), 123);
+    }
+    {
+        QVarLengthArray<T> vla;
+        QCOMPARE(vla.capacity(), 256);    // notice, should we change the default
+    }
+}
+
 void tst_QVarLengthArray::append()
 {
     QVarLengthArray<QString, 2> v;