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This commit adds end-to-end tests using generated fixtures.
For each fixture, there are multiple entry points. Coverage is first collected when running each entry point in its own Node process, then when running all of them in the same process.
The end-to-end tests check that merging the coverages from the individual entry points returns the coverage of the combined run.
The library currently fails these tests: I believe that it indicates bugs in the current implementation.
This commit also improves coverage (see #2).