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Add tests for Engine and CharDataFiller classes #27
These changes add tests of the Engine and CharDataFiller classes. Their addition improves the code coverage; further testing of e.g. the Engine class, although possibly beneficial, would likely require a large amount of work to bring the coverage up only a small amount. The statement coverage of the entire distribution is now 88%, and this is hopefully high enough to be reasonably sure that future code changes will be checked by the test suite.