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Disable QgsTaskManager::waitForFinished test by default

The test intermittently fails on Travis builds, likely due
to the platform's inconsistent availability to multiple threads.
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nyalldawson committed Jun 5, 2017
1 parent 176b7ca commit 632a2be86a75f844a49e4872335e54e5758fdd1b
Showing with 13 additions and 3 deletions.
  1. +13 −3 tests/src/core/testqgstaskmanager.cpp
@@ -22,6 +22,12 @@
#include <QObject>
#include "qgstest.h"

// some of these tests have intermittent failure on Travis, probably due
// to inconsistent availability to multiple threads on the platform.
// These tests are disabled unless WITH_FLAKY is 1.

#define WITH_FLAKY 0 //TODO - disable only for Travis?

class TestTask : public QgsTask
{
Q_OBJECT
@@ -194,13 +200,15 @@ class TestQgsTaskManager : public QObject
void task();
void taskResult();
void taskFinished();
#if 0 //flaky
#if WITH_FLAKY
void subTask();
#endif
void addTask();
void taskTerminationBeforeDelete();
void taskId();
#if WITH_FLAKY
void waitForFinished();
#endif
void progressChanged();
void statusChanged();
void allTasksFinished();
@@ -434,7 +442,7 @@ void TestQgsTaskManager::taskFinished()
QCOMPARE( *resultObtained, false );
}

#if 0 //flaky
#if WITH_FLAKY
void TestQgsTaskManager::subTask()
{
QgsTaskManager manager;
@@ -657,6 +665,7 @@ void TestQgsTaskManager::taskId()
delete task3;
}

#if WITH_FLAKY
void TestQgsTaskManager::waitForFinished()
{
QgsTaskManager manager;
@@ -696,6 +705,7 @@ void TestQgsTaskManager::waitForFinished()
QCOMPARE( timeoutTooShortTask->waitForFinished( 20 ), false );
QCOMPARE( timeoutTooShortTask->status(), QgsTask::Running );
}
#endif

void TestQgsTaskManager::progressChanged()
{
@@ -1115,7 +1125,7 @@ void TestQgsTaskManager::managerWithSubTasks()
QCOMPARE( manager->activeTasks().count(), 1 );
QVERIFY( manager->activeTasks().contains( parent ) );
QCOMPARE( spy.count(), 1 );
#if 0 // flaky
#if WITH_FLAKY
//manager should not directly listen to progress reports from subtasks
//(only parent tasks, which themselves include their subtask progress)
QCOMPARE( spyProgress.count(), 0 );

5 comments on commit 632a2be

@m-kuhn

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@m-kuhn m-kuhn replied Jun 5, 2017

I think there is actually a race condition somewhere, that I couldn't pin down yet. I just hope it's in the test and not the waitForFinished() code.

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@nyalldawson nyalldawson replied Jun 5, 2017

Should I reenable? I just know that many other tests which rely on multiple threads are flaky on Travis. e.g. there's others in the task manager test suite which i've had to disable, and https://github.com/qgis/QGIS/blob/master/tests/src/python/test_qgslocator.py

None of these I can get to fail locally, despite everything I throw at it. Same with the waitForFinished test.

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@m-kuhn m-kuhn replied Jun 6, 2017

I would only re-enable once additional debug output has been added to investigate the issue.

I don't have any lead yet. But I have a bad feeling with putting them aside as "travis issues" and fear that deadlocks sit waiting somewhere to surface when they are least expected...

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@nyalldawson nyalldawson replied Jun 6, 2017

I don't have any lead yet. But I have a bad feeling with putting them aside as "travis issues" and fear that deadlocks sit waiting somewhere to surface when they are least expected...

Me too! But it was failing quite a lot, and was at the level where we've previously disabled whole tests. I'd rather ifdef out a single test then the whole set of task manager tests....

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@m-kuhn m-kuhn replied Jun 6, 2017

Did you write a note on the mailing list? :P

Seriously, I was just about to disable it myself

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