Use expect-test for HIR tests

This makes it easier to update cascading test failures while still
making output reviewable in the PR.

1 files changed, 10 insertions, 0 deletions

diff --git a/doc/zjit.md b/doc/zjit.md
index a6e2f745d9..e71a0df539 100644
--- a/doc/zjit.md
+++ b/doc/zjit.md
@@ -50,6 +50,16 @@ You can also run a single test case by specifying the function name:
 make zjit-test ZJIT_TESTS=test_putobject
 ```
 
+If you expect that your changes cause tests to fail and they do, you can have
+`expect-test` fix the expected value for you by putting `UPDATE_EXPECT=1`
+before your test command, like so:
+
+```
+UPDATE_EXPECT=1 make zjit-test ZJIT_TESTS=test_putobject
+```
+
+Test changes will be reviewed alongside code changes.
+
 <details>
 
 <summary>Setting up zjit-test</summary>