Add tests/test-committer

This checks to see if the EMAIL environment variable is being used for commit.

tests/test-committer

@@ -0,0 +1,12 b''
+#!/bin/sh
+
+unset HGUSER
+EMAIL="My Name <[e-mail]>"
+export EMAIL
+
+hg init test
+cd test
+touch asdf
+hg add asdf
+hg commit -d '1000000 0' -m commit-1
+hg tip

tests/test-committer.out

@@ -0,0 +1,6 b''
+changeset:   0:9426b370c206
+tag:         tip
+user:        My Name <[e-mail]>
+date:        Mon Jan 12 13:46:40 1970 +0000
+summary:     commit-1
+