Write these up and submit them to Canvas, the day before the lecture.

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You do not need to write a summary/commentary for the papers:
* On testing non-testable programs
* Metamorphic Testing: A Review of Challenges and Opportunities

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Define the following terms:
 * Partial test oracle
 * Follow-up input
 * Metamorphic relation

Write a two-sentence answer to each of the following questions:
 * In the context of software testing, how are invariants and metamorphic relations similar and how are they different?
 * Give two examples for two distinct systems that are inherently hard to test. For each system, give a metamorphic relation.
 * Has metamorphic testing solved the oracle problem? Why or why not?

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end.