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Rather than relying on Seed(0), try things in a different order every time. The seed is logged so that if something fails, the problem can be reproduced using the -seed flag.
Removes elements from a larger minmax heap in a random order, making sure all elements were yielded and no non-elements were yielded.
This can be used when a test fails unexpectedly to show the structure of the tree and where values are. Perhaps this is overkill, but I found it very useful.
This now checks that grandchildren have the correct relationship to nodes. Without this, it was possible for an invalid tree to pass verify().
This appears to fix all of the ordering problems I have been experiencing so far.
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There is a bug causing minmax heap invariants to be violated in certain conditions when using Remove() or Fix().
I also added a lot to the test suite to aid in debugging and visualizing the problem.