test_scorpion.py should load a dummy DB, call the hypothesis generator, and assert a generated hypothesis.

[Adam Marcus]

Resolved by #14.

• https://dspace.mit.edu/bitstream/handle/1721.1/89076/scorpion-vldb13.pdf?sequence=1&isAllowed=y
• https://homes.cs.washington.edu/~suciu/main_explanation.pdf
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