It means that most of the code base was executed while running the tests.
That would be a bad idea, because coverage doesn't tell you anything about the quality of your tests. It's for helping you find things that need to be tested, not for telling you whether your tests are any good.
The most useful information that the coverage report provides is the list of lines that weren't executed, because that's what allows you to know what new tests you might want to add.
Pop quiz - version control hooks
It can ensure that your tests are executed frequently, and can make you immediately aware when you're checking in broken code.
Don't make it impossible to check in broken code. Don't make version control hooks a matter of ...
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