Added tests for custom actions (TODO_ACTIONS_DIR).

t0002-actions.sh for locating the .todo.actions.d directory.
t8000-actions.sh for the contract between todo.sh and custom actions.

tests/t0002-actions.sh

@@ -0,0 +1,40 @@
+#!/bin/sh
+
+test_description='todo.sh actions.d
+
+This test just makes sure that todo.sh can locate custom actions.
+'
+. ./test-lib.sh
+
+# All the below tests will output the custom action message
+cat > expect << EOF
+TODO: foo
+EOF
+
+cat > foo << EOF
+echo "TODO: foo"
+EOF
+chmod +x foo
+
+test_expect_success 'custom action (default location 1)' '
+    mkdir .todo.actions.d
+    cp foo .todo.actions.d/
+    todo.sh foo > output;
+    test_cmp expect output && rm -rf .todo.actions.d
+'
+
+test_expect_success 'custom action (default location 2)' '
+    mkdir -p .todo/actions
+    cp foo .todo/actions/
+    todo.sh foo > output;
+    test_cmp expect output && rm -rf .todo/actions
+'
+
+test_expect_success 'custom action (env variable)' '
+    mkdir myactions
+    cp foo myactions/
+    TODO_ACTIONS_DIR=myactions todo.sh foo > output;
+    test_cmp expect output && rm -rf myactions
+'
+
+test_done