Add QBENCMARK_ONCE to QTestLib.

The code block associated with QBENCHMARK_ONCE macro will only be executed once,
whether the backend returns a valid result or not. The "-iterations" command line
argument is also ignored.

This is useful for benchmarking code that has side effects.

Revby: jasplin

2 files changed, 15 insertions, 1 deletions

diff --git a/tests/auto/selftests/benchlibwalltime/tst_benchlibwalltime.cpp b/tests/auto/selftests/benchlibwalltime/tst_benchlibwalltime.cpp
index de65599..8474144f 100644
--- a/tests/auto/selftests/benchlibwalltime/tst_benchlibwalltime.cpp
+++ b/tests/auto/selftests/benchlibwalltime/tst_benchlibwalltime.cpp
@@ -50,6 +50,7 @@ class tst_BenchlibWalltime: public QObject
 private slots:
     void waitForOneThousand();
     void waitForFourThousand();
+    void qbenchmark_once();
 };
 
 void tst_BenchlibWalltime::waitForOneThousand()
@@ -66,6 +67,16 @@ void tst_BenchlibWalltime::waitForFourThousand()
     }
 }
 
+void tst_BenchlibWalltime::qbenchmark_once()
+{
+    int iterations = 0;
+    QBENCHMARK_ONCE {
+        ++iterations;
+    }
+    QCOMPARE(iterations, 1);
+}
+
+
 QTEST_MAIN(tst_BenchlibWalltime)
 
 #include "tst_benchlibwalltime.moc"
diff --git a/tests/auto/selftests/expected_benchlibwalltime.txt b/tests/auto/selftests/expected_benchlibwalltime.txt
index 03f2465..ec2d020 100644
--- a/tests/auto/selftests/expected_benchlibwalltime.txt
+++ b/tests/auto/selftests/expected_benchlibwalltime.txt
@@ -7,6 +7,9 @@ PASS   : tst_BenchlibWalltime::waitForOneThousand()
 RESULT : tst_BenchlibWalltime::waitForFourThousand():
      4,000 msec per iteration (total: 4000, iterations: 1)
 PASS   : tst_BenchlibWalltime::waitForFourThousand()
+RESULT : tst_BenchlibWalltime::qbenchmark_once():
+     0 msec per iteration (total: 0, iterations: 1)
+PASS   : tst_BenchlibWalltime::qbenchmark_once()
 PASS   : tst_BenchlibWalltime::cleanupTestCase()
-Totals: 4 passed, 0 failed, 0 skipped
+Totals: 5 passed, 0 failed, 0 skipped
 ********* Finished testing of tst_BenchlibWalltime *********