(TestProjFile): Clarify the doc-string
(ProjFileReadTests): Update doc-string
(ProjFileReadTests.test_get_system_proj_file): Check whether the
system proj files is cached.
(ProjFileLoadTestCase): New base class for the proj file tests
derived from support.FileLoadTestCase to provide some common
behavior.
(TestLoadingProjFile)
(TestLoadingProjFileWithEmptyProjectionlist.file_contents)
(TestProjFileWithInvalidParameters.file_contents): Derive from
ProjFileLoadTestCase
(TestLoadingProjFile.test_caching): New. Test whether the cache
works
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