If testName is None, this trait's implementation of this method calls these two methods on this object in this order:

1. runNestedSuites(report, stopper, tagsToInclude, tagsToExclude, configMap, distributor)
2. runTests(testName, report, stopper, tagsToInclude, tagsToExclude, configMap)

If testName is defined, then this trait's implementation of this method calls runTests, but does not call runNestedSuites. This behavior is part of the contract of this method. Subclasses that override run must take care not to call runNestedSuites if testName is defined. (The OneInstancePerTest trait depends on this behavior, for example.)

Subclasses and subtraits that override this run method can implement them without invoking either the runTests or runNestedSuites methods, which are invoked by this trait's implementation of this method. It is recommended, but not required, that subclasses and subtraits that override run in a way that does not invoke runNestedSuites also override runNestedSuites and make it final. Similarly it is recommended, but not required, that subclasses and subtraits that override run in a way that does not invoke runTests also override runTests (and runTest, which this trait's implementation of runTests calls) and make it final. The implementation of these final methods can either invoke the superclass implementation of the method, or throw an UnsupportedOperationException if appropriate. The reason for this recommendation is that ScalaTest includes several traits that override these methods to allow behavior to be mixed into a Suite. For example, trait BeforeAndAfterEach overrides runTestss. In a Suite subclass that no longer invokes runTests from run, the BeforeAndAfterEach trait is not applicable. Mixing it in would have no effect. By making runTests final in such a Suite subtrait, you make the attempt to mix BeforeAndAfterEach into a subclass of your subtrait a compiler error. (It would fail to compile with a complaint that BeforeAndAfterEach is trying to override runTests, which is a final method in your trait.)

This trait's implementation of this method returns the sum of:

• the size of the testNames List, minus the number of tests marked as ignored
• the sum of the values obtained by invoking expectedTestCount on every nested Suite contained in nestedSuites

The main purpose of this method implementation is to render a compiler error an attempt to mix in a trait that overrides withFixture. Because this trait does not actually use withFixture, the attempt to mix in behavior would very likely not work.

The main purpose of this method implementation is to render a compiler error an attempt to mix in a trait that overrides runNestedSuites. Because this trait does not actually use runNestedSuites, the attempt to mix in behavior would very likely not work.

The main purpose of this method implementation is to render a compiler error an attempt to mix in a trait that overrides runTests. Because this trait does not actually use runTests, the attempt to mix in behavior would very likely not work.

The main purpose of this method implementation is to render a compiler error an attempt to mix in a trait that overrides runTest. Because this trait does not actually use runTest, the attempt to mix in behavior would very likely not work.