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Type: Bug
Resolution: Cannot Reproduce
Priority: P1: Critical
Fix Version/s: 6.4
Affects Version/s: 6.3
Component/s: QML: Declarative and Javascript Engine
Labels:
- qmlnext

I ran a pre-check on https://codereview.qt-project.org/c/qt/qtdeclarative/+/363532/17#message-21078822ec5972ec100aaa32d292fe4904f2930d and got a failure:

agent:2021/08/11 17:52:17 build.go:391: 92: FAIL!  : tst_QQmlImport::removeDynamicPlugin() '!plugins.isEmpty()' returned FALSE. ()
agent:2021/08/11 17:52:17 build.go:391: 92:    Loc: [/Users/qt/work/qt/qtdeclarative/tests/auto/qml/qqmlimport/tst_qqmlimport.cpp(374)]

I built Qt on macOS without the patch applied (qtdeclarative at 32b27f24a94a5b1a3d125b5b9f97109c4ca9c5c6 and dependent modules synced according to dependencies.yaml) and got a different failure:

Mitchs-MacBook-Pro:qtdeclarative mitch$ ninja tst_qqmlimport_check
[8/8] Running /usr/local/Cellar/cmake/3.21.1/bin/ctest -V -R "^tst_qqmlimport$"
FAILED: tests/auto/qml/qqmlimport/CMakeFiles/tst_qqmlimport_check /Users/mitch/dev/qt-dev2-debug-non-fw/qtdeclarative/tests/auto/qml/qqmlimport/CMakeFiles/tst_qqmlimport_check 
cd /Users/mitch/dev/qt-dev2-debug-non-fw/qtdeclarative/tests/auto/qml/qqmlimport && /usr/local/Cellar/cmake/3.21.1/bin/ctest -V -R "^tst_qqmlimport\$"
UpdateCTestConfiguration  from :/Users/mitch/dev/qt-dev2-debug-non-fw/qtdeclarative/tests/auto/qml/qqmlimport/DartConfiguration.tcl
UpdateCTestConfiguration  from :/Users/mitch/dev/qt-dev2-debug-non-fw/qtdeclarative/tests/auto/qml/qqmlimport/DartConfiguration.tcl
Test project /Users/mitch/dev/qt-dev2-debug-non-fw/qtdeclarative/tests/auto/qml/qqmlimport
Constructing a list of tests
Done constructing a list of tests
Updating test list for fixtures
Added 0 tests to meet fixture requirements
Checking test dependency graph...
Checking test dependency graph end
test 1
    Start 1: tst_qqmlimport

1: Test command: /usr/local/Cellar/cmake/3.21.1/bin/cmake "-P" "/Users/mitch/dev/qt-dev2-debug-non-fw/qtdeclarative/tests/auto/qml/qqmlimport/tst_qqmlimportWrapperDebug.cmake"
1: Test timeout computed to be: 10000000
1: ********* Start testing of tst_QQmlImport *********
1: Config: Using QtTest library 6.2.0, Qt 6.2.0 (x86_64-little_endian-lp64 shared (dynamic) debug build; by Clang 12.0.5 (clang-1205.0.22.11) (Apple)), macos 11.4
1: PASS   : tst_QQmlImport::initTestCase()
1: PASS   : tst_QQmlImport::importPathOrder()
1: PASS   : tst_QQmlImport::testDesignerSupported()
1: PASS   : tst_QQmlImport::uiFormatLoading()
1: PASS   : tst_QQmlImport::completeQmldirPaths(QtQml)
1: PASS   : tst_QQmlImport::completeQmldirPaths(QtQml.Models)
1: PASS   : tst_QQmlImport::completeQmldirPaths(org.qt-project.foo.bar 0.1)
1: PASS   : tst_QQmlImport::completeQmldirPaths(org.qt-project.foo.bar 4)
1: PASS   : tst_QQmlImport::completeQmldirPaths(org.qt-project.foo.bar)
1: PASS   : tst_QQmlImport::interceptQmldir()
1: PASS   : tst_QQmlImport::singletonVersionResolution()
1: FAIL!  : tst_QQmlImport::removeDynamicPlugin() 'component.isReady()' returned FALSE. ()
1:    Loc: [/Users/mitch/dev/qt-dev2/qtdeclarative/tests/auto/qml/qqmlimport/tst_qqmlimport.cpp(362)]
1: PASS   : tst_QQmlImport::partialImportVersions(empty)
1: PASS   : tst_QQmlImport::partialImportVersions(2)
1: PASS   : tst_QQmlImport::partialImportVersions(6)
1: PASS   : tst_QQmlImport::partialImportVersions(2.0)
1: PASS   : tst_QQmlImport::partialImportVersions(2.3)
1: PASS   : tst_QQmlImport::partialImportVersions(2.15)
1: PASS   : tst_QQmlImport::partialImportVersions(6.0)
1: PASS   : tst_QQmlImport::registerModuleImport()
1: PASS   : tst_QQmlImport::importDependenciesPrecedence()
1: PASS   : tst_QQmlImport::envResourceImportPath()
1: PASS   : tst_QQmlImport::preferResourcePath()
1: PASS   : tst_QQmlImport::cleanupTestCase()
1: Totals: 23 passed, 1 failed, 0 skipped, 0 blacklisted, 2501ms
1: ********* Finished testing of tst_QQmlImport *********
1: CMake Error at tst_qqmlimportWrapperDebug.cmake:17 (message):
1:   
1:   /Users/mitch/dev/qt-dev2-debug-non-fw/qtdeclarative/tests/auto/qml/qqmlimport/tst_qqmlimport
1:   execution failed.
1: 
1: 
1/1 Test #1: tst_qqmlimport ...................***Failed    5.38 sec

0% tests passed, 1 tests failed out of 1

Label Time Summary:
tests/auto/qml/qqmlimport/tst_qqmlimport    =   5.38 sec*proc (1 test)

Total Test time (real) =   5.38 sec

The following tests FAILED:
	  1 - tst_qqmlimport (Failed)
Errors while running CTest
Output from these tests are in: /Users/mitch/dev/qt-dev2-debug-non-fw/qtdeclarative/tests/auto/qml/qqmlimport/Testing/Temporary/LastTest.log
Use "--rerun-failed --output-on-failure" to re-run the failed cases verbosely.
ninja: build stopped: subcommand failed.

I then tried improving the failure message:

@@ -359,7 +359,7 @@ void tst_QQmlImport::removeDynamicPlugin()
         // Load something that adds a dynamic plugin
         QQmlComponent component(&engine);
         component.setData(QByteArray("import QtTest 1.0; TestResult{}"), QUrl());
-        QVERIFY(component.isReady());
+        QVERIFY2(component.isReady(), qPrintable(component.errorString()));
     }
     QQmlImportDatabase *imports = &QQmlEnginePrivate::get(&engine)->importDatabase;
     const QStringList &plugins = imports->dynamicPlugins();

but then the test started passing.