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These are problems with Maven's own integration tests. The ones we use to make sure that changes to a new version of Maven don't break anything that previously worked.

h3. Goals
    * An IT should be completely self-contained so that the problem can
      be understood by looking in one place, in one Maven project.
    * We should be able to create an Archetype so that users can easily
      create ITs for us
    * The ITs should be in a project of their own so that we can reuse
      them across versions of Maven. We could actually run new versions
      of integration tests against old versions of Maven. Solution: the
      ITs are now in a separate build and it is possible to run them
    * We should be able to easily integrate the IT into a larger run
      where we can use forked or embedded execution.
    * We should create Archetypes for all categories of problems so
      that anyone can generate tests cases for us. Then there is so
      much that we can do in terms of automating this process of
      checking tests for quality along with the patches.
    * automate the testing of ITs submitted by users
    * Each IT should have its own repository if it needs resources from
      repository. We can't mess with a users repository when testing.
    * We need to have a file system based remote repository for testing
    * We need to standardize on integration testing in general. We have
      people going all over the place and it's a disaster.
        * We have too many IT plugins (3)
        * We have too many invokers (5)
        * We have too many verifiers (3)
    * The ITs should run nicely from an IDE. Solution: this does work
      but requires that you run mvn clean resources:testResources first
      as the IDE doesn't know how to set that up. Needs to be fully
      fixed. But it is much nicer running this stuff in your IDE.
h3. Problems with ITs
    * Verifier jar required by the bootstrap requires a special
      verifier.jar there is no released version of this tool. Solution:
      the bootstrap now uses Ant and we've gotten rid of a lot of the
      complexity.
    * The maven-core-it plugin needs to be decoupled into its separate
      purposes because there are currently 12 different things going on
      in the plugin and it would be really confusing for a new user to
      figure out what's going on in the plugin and how it applies to
      the integration testing. Solution: these have now been broken
      down into plugins that correspond to their function in the ITs.
    * it0006 is an integration test for the verifier plugin.
    * it0014 uses the compiler plugin to test plugin configuration.
    * it0016 is an integration test for the WAR plugin.
    * it0017 is an integration test for the EJB plugin.
    * it0018 uses real dependencies to test artifact resolution.
    * it0020 tests beanshell mojo support.
    * it0024 uses the compiler plugin to test mojo configuration.
    * it0028 uses the compiler plugin to test mojo configuration.
    * it0029 uses the compiler plugin to test for pluginManagement
      injection of plugin configuration.
    * it0033 is an integration test for the EAR plugin.
    * it0043 uses the help plugin to look at the state of the final
      POM, we should have this built into Maven for testing.
    * it0047 uses plexus-container-default for testing.
    * it0048 uses the surefire plugin to test default value population
      for mojo parameters.
    * it0050 is an integration test for the surefire plugin.
    * it0051 is an integration test for the release plugin.
    * it0052 is an integration test for the release plugin.
    * it0054 is an integration test for the resources plugin.
    * it0055 is an integration test for the compiler plugin.
    * it0056 uses the compiler plugin to test multiple executions.
    * it0060 uses the compiler plugin to test aggregation of list
      configuration items when using 'combine.children=append'
      attribute.
    * it0063 tests JDK 1.4.2 specifics.
    * it0068 uses the modello plugin to test repository accumulation
      (i'm not sure what that means, John?)
    * it0069 uses classworlds dependency to test offline mode.
    * it0070 is an integration test for the RAR plugin.
    * it0074 uses the compiler plugin to test mojo configuration.
    * it0076 uses the WAR plugin to test pluginManagement.
    * it0078 uses the compiler plugin to test pluginManagement.
    * it0079 uses the source plugin to test that attached artifacts
      have the same build number as the primary artifact.
    * it0080 uses the WAR plugin to test an artifact handler that
      specifies no contribution to transitive dependencies. if the
      behavior of this handler changed the test would break.
    * it0081 uses production dependency of wagon as a dependency
    * it0083 uses the WAR plugin to test an artifact handler that the
      WAR artifact handler currently behaves like
    * it0086 uses production dependency of bsh to test classloading
    * it0087 uses prodcution dependency of commons-logging to test
      classloading
    * it0089 is an integration test for the checkstyle plugin
    * it0094 has a test that attempts to access a protected field in a
      ClassRealm
    * it0095 uses the help and verifier plugins to test URL calculation
    * it0100 uses the antrun plugin to make sure ${parent.artifactId}
      resolves correctly
    * it0102 uses the help and antrun plugins to test profile activation
    * it0104 uses the surefire plugin to test interpolation
    * it0105 is an integration test for the resources plugin
    * artifactIds should be aligned with directories