Domain class test fails if no DataSource configured

If you have no DataSources configured in an application the domain class tests cause an exception which ends the testing process.

Here is how to reproduce.

1. grails create-app test
2. cd test
3. vi grails-app/conf/DataSource.groovy

edit the contents to be just:
dataSource {
}

4. grails test-app
(The tests pass at this point)
5. grails create-domain-class mydomain
6. grails test-app
The tests stop with an exception. Further domain class tests are not attempted.

Running 1 Integration Test...
Running test MydomainTests...
testSomething...Error executing tests could not execute query; nested exception is org.hibernate.exception.SQLGrammarException: could not execute query ...
org.springframework.dao.InvalidDataAccessResourceUsageException: could not execute query; nested exception is org.hibernate.exception.SQLGrammarException: could not execute query
at org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:613)
at org.springframework.orm.hibernate3.HibernateAccessor.convertHibernateAccessException(HibernateAccessor.java:412)
at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:378)
at org.springframework.orm.hibernate3.HibernateTemplate.loadAll(HibernateTemplate.java:541)
at org.codehaus.groovy.grails.orm.hibernate.metaclass.ListPersistentMethod.doInvokeInternal(ListPersistentMethod.java:50)
at org.codehaus.groovy.grails.orm.hibernate.metaclass.AbstractStaticPersistentMethod.invoke(AbstractStaticPersistentMethod.java:70)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

[*** Pages of stacktrace lines cut here ***]

at java.lang.reflect.Method.invoke(Method.java:585)
at org.codehaus.groovy.tools.GroovyStarter.rootLoader(GroovyStarter.java:101)
at org.codehaus.groovy.tools.GroovyStarter.main(GroovyStarter.java:130)
Caused by: org.hibernate.exception.SQLGrammarException: could not execute query
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:67)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.loader.Loader.doList(Loader.java:2223)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104)
at org.hibernate.loader.Loader.list(Loader.java:2099)
at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:94)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1569)
at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:283)
at org.springframework.orm.hibernate3.HibernateTemplate$5.doInHibernate(HibernateTemplate.java:545)
at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:373)
... 407 more
Caused by: java.sql.SQLException: Table not found in statement [select this_.id as id0_0_, this_.version as version0_0_ from mydomain this_]
at org.hsqldb.jdbc.Util.throwError(Unknown Source)
at org.hsqldb.jdbc.jdbcPreparedStatement.<init>(Unknown Source)
at org.hsqldb.jdbc.jdbcConnection.prepareStatement(Unknown Source)
at org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:505)
at org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:423)
at org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:139)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1547)
at org.hibernate.loader.Loader.doQuery(Loader.java:673)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.doList(Loader.java:2220)
... 414 more
Error running tests: org.springframework.dao.InvalidDataAccessResourceUsageException: could not execute query; nested exception is org.hibernate.exception.SQLGrammarException: could not execute query

The work around is to edit back in the hsql databases entries into DataSource.groovy.