Fix test on Qt5.6

Author: nyalldawson

tests/src/core/testqgsprocessing.cpp

@@ -2377,7 +2377,7 @@ void TestQgsProcessing::parameterNumber()
   QCOMPARE( iNumber, 5 );
 
   code = def->asScriptCode();
-  QCOMPARE( code, QStringLiteral( "##optional=optional number 5.4" ) );
+  QCOMPARE( code.left( 30 ), QStringLiteral( "##optional=optional number 5.4" ) ); // truncate code to 30, to avoid Qt 5.6 rounding issues
   fromCode.reset( dynamic_cast< QgsProcessingParameterNumber * >( QgsProcessingParameters::parameterFromScriptCode( code ) ) );
   QVERIFY( fromCode.get() );
   QCOMPARE( fromCode->name(), def->name() );