ocaml-ppx-expect

Ppx_expect is a framework for writing tests in OCaml, similar to Cram (https://bitheap.org/cram/). Ppx_expect mimics the existing inline tests framework with the `let%expect_test` construct. The body of an expect-test can contain output-generating code, interleaved with `%expect` extension expressions to denote the expected output. When run, these tests will pass iff the output matches what was expected. If a test fails, a corrected file with the suffix ".corrected" will be produced with the actual output, and the `inline_tests_runner` will output a diff.

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