To use `record-test.sh`, just put it right before the `hb-shape` invocation:
```sh
-$ ./hb-unicode-encode 41 42 43 627 | ./record-test.sh ../../util/hb-shape font.ttf
+$ ./hb-unicode-encode 41 42 43 627 | ./record-test.sh ../../util/hb-subset ../../util/hb-shape font.ttf
```
what this does is:
* Subset the font for the sequence of Unicode characters requested,
to an existing or new test file in `data/in-house/tests` using `-o`,
e.g.:
```sh
-$ ./hb-unicode-encode 41 42 43 627 | ./record-test.sh -o data/in-house/tests/test-name.test ../../util/hb-shape font.ttf
+$ ./hb-unicode-encode 41 42 43 627 | ./record-test.sh -o data/in-house/tests/test-name.tests ../../util/hb-subset ../../util/hb-shape font.ttf
```
If you created a new test file, add it to `data/in-house/Makefile.sources`