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This is a follow up to D88792 which found an issue in a call to PExpectTest's expect function that allows passing a string to the `substrs` parameter. However this issue was found by just grepping and TestPExpect's expect function is still accepting a single string as a value to `substrs`. This patch adds the same sanity check that D88792 added to the PExpectTest's implementation of `expect` and also adds a small test for it. Reviewed By: kastiglione, JDevlieghere Differential Revision: https://reviews.llvm.org/D89302