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/t8000-actions.sh

@@ -0,0 +1,52 @@
+#!/bin/sh
+
+test_description='custom actions functionality
+
+This test covers the contract between todo.sh and custom actions.
+'
+. ./test-lib.sh
+
+unset TODO_ACTIONS_DIR
+mkdir .todo.actions.d
+cat > .todo.actions.d/foo << EOF
+echo "TODO: foo"
+EOF
+
+test_todo_session 'nonexecutable action' <<EOF
+>>> todo.sh foo
+Usage: todo.sh [-fhpantvV] [-d todo_config] action [task_number] [task_description]
+Try 'todo.sh -h' for more information.
+=== 1
+EOF
+
+chmod +x .todo.actions.d/foo
+test_todo_session 'executable action' <<EOF
+>>> todo.sh foo
+TODO: foo
+EOF
+
+cat > .todo.actions.d/ls << EOF
+echo "TODO: my ls"
+EOF
+chmod +x .todo.actions.d/ls
+test_todo_session 'overriding built-in action' <<EOF
+>>> todo.sh ls
+TODO: my ls
+
+>>> todo.sh command ls
+--
+TODO: 0 of 0 tasks shown
+EOF
+
+cat > .todo.actions.d/bad << EOF
+echo "TODO: bad"
+exit 42
+EOF
+chmod +x .todo.actions.d/bad
+test_todo_session 'failing action' <<EOF
+>>> todo.sh bad
+TODO: bad
+=== 42
+EOF
+
+test_done