[PATCH v2] Document external dependencies in the test suite

[Ethan Glasser-Camp]

From: Ethan Glasser-Camp <ethan at betacantrips.com>

Add an explicit note to the README explaining what programs are
necessary and the perhaps-surprising behavior of skipping tests if
they aren't present.

Signed-off-by: Ethan Glasser-Camp <ethan at betacantrips.com>
---

v2 suggested by Dmitry Kurochkin: document all the dependencies.

 test/README |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/test/README b/test/README
index bde6db0..44ff653 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
-- 
1.7.5.4