1.3 KiB
Fixing Tests
The test suite contains some tests that compare the produced output
with the expected output. For example, the directory tests/lean
contains files such as bad_class.lean and
bad_class.lean.expected.out.
The later contains the expected output for the test file bad_class.lean.
When the Lean source code or the standard library are modified, some of these
tests break because the produced output is slightly different, and we have
to reflect the changes int the .lean.expected.out files.
We should not blindly copy the new produced output since we may accidentally
miss a bug introduced by recent changes.
The test suite contains commands that allow us to see what changed in a convenient way.
First, we must install meld. On Ubuntu, we can do it by simply executing
sudo apt-get install meld
Now, suppose bad_class.lean test is broken. We can see the problem by going to test/lean directory and
executing
./test_single.sh ../../bin/lean bad_class.lean yes
When the yes option is provided, meld is automatically invoked
whenever there is discrepancy between the produced and expected
outputs. meld can also be used to repair the problems.