Build requires tests disabled

Building for the first time on a machine:
build.sh and build.sh fail for Maven 2.06 and 2.0.7 with missing ClassWorldsLauncher
Build page:
http://maven.apache.org/continuum/guides/development/guide-build-continuum.html does not mention need to download Sun jars.
I could not understand last paragraph about assembly:assembly.

mvn install fails the test for continuum-release:
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 1.344 sec <<< FAILURE!
testReleases(org.apache.maven.continuum.release.executors.ReleaseTaskExecutorTest) Time elapsed: 1.203 sec <<< ERROR!
java.io.FileNotFoundException: c:\continuum\continuum-release\target\test-classes\work-dir\pom.xml (The system cannot find the path specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:106)
at org.codehaus.plexus.util.FileUtils.fileRead(FileUtils.java:273)
at org.apache.maven.continuum.release.executors.ReleaseTaskExecutorTest.releaseSimpleProject(ReleaseTaskExecutorTest.java:110)
at org.apache.maven.continuum.release.executors.ReleaseTaskExecutorTest.testReleases(ReleaseTaskExecutorTest.java:129)

mvn -Dmaven.test.skip=true install does work !!