Add a bunch of testcases for the pattern match checker
Adds regression tests for tickets #17207 (closed), #17208, #17215, #17216, #17218 (closed), #17219, #17248 (closed).
Also fixes #17264 (closed) by adding regression tests for the series.
Adds regression tests for tickets #17207 (closed), #17208, #17215, #17216, #17218 (closed), #17219, #17248 (closed).
Also fixes #17264 (closed) by adding regression tests for the series.