Minimal CLI tool to verify program output using a simple input/output test file.

myscript.iotest:

input1
---
output1
===
input2
---
output2

Run tests:

iotest myscript.iotest ./myscript.sh

Each of the two tests is run against ./myscript.sh, passing the input to stdin and asserting that stdout matches the expected output.

• Each test case consists of input and expected output.

• Separate input and output with ---.

• Separate multiple tests with ===.