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-rw-r--r--test/README21
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diff --git a/test/README b/test/README
index bde6db0..43656a3 100644
--- a/test/README
+++ b/test/README
@@ -6,6 +6,19 @@ When fixing bugs or enhancing notmuch, you are strongly encouraged to
add tests in this directory to cover what you are trying to fix or
enhance.
+Prerequisites
+-------------
+Some tests require external dependencies to run. Without them, they
+will be skipped, or (rarely) marked failed. Please install these, so
+that you know if you break anything.
+
+ - dtach(1)
+ - emacs(1)
+ - emacsclient(1)
+ - gdb(1)
+ - gpg(1)
+ - python(1)
+
Running Tests
-------------
The easiest way to run tests is to say "make test", (or simply run the
@@ -189,6 +202,14 @@ library for your script to use.
tests that may run in the same Emacs instance. Use `let' instead
so the scope of the changed variables is limited to a single test.
+ test_emacs_expect_t <emacs-lisp-expressions>
+
+ This function executes the provided emacs lisp script within
+ emacs in a manner similar to 'test_emacs'. The expressions should
+ return the value `t' to indicate that the test has passed. If the
+ test does not return `t' then it is considered failed and all data
+ returned by the test is reported to the tester.
+
test_done
Your test script must have test_done at the end. Its purpose