1 files changed, 86 insertions, 0 deletions
diff --git a/test/xdg_pipe_menu_watcher_tests.erl b/test/xdg_pipe_menu_watcher_tests.erl
new file mode 100644
index 0000000..cca5cc2
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+++ b/test/xdg_pipe_menu_watcher_tests.erl
@@ -0,0 +1,86 @@
+-module(xdg_pipe_menu_watcher_tests).
+
+-include_lib("eunit/include/eunit.hrl").
+
+%% Exercises the real debounce-timer-reset-then-invalidate wiring by
+%% sending the watcher a synthetic message of the exact shape `fs'
+%% delivers, rather than waiting on a real inotify event -- `fs'
+%% itself is treated as out of scope for this test.
+debounced_event_invalidates_cache_test() ->
+    Root = mk_tmp_dir(),
+    AppDir = filename:join(Root, "applications"),
+    ok = file:make_dir(AppDir),
+    write_desktop(AppDir, "foo.desktop", "Foo", "foo"),
+    PrevDebounce = application:get_env(xdg_pipe_menu, debounce_ms),
+    application:set_env(xdg_pipe_menu, debounce_ms, 20),
+    with_env(
+        [{"XDG_DATA_HOME", Root}, {"XDG_DATA_DIRS", "/does-not-exist-eunit"}],
+        fun() ->
+            {ok, CachePid} = xdg_pipe_menu_cache:start_link(),
+            {ok, WatcherPid} = xdg_pipe_menu_watcher:start_link(),
+
+            write_desktop(AppDir, "bar.desktop", "Bar", "bar"),
+            WatcherPid ! {self(), {fs, file_event}, {"dummy", [modified]}},
+            timer:sleep(100),
+
+            Menu = xdg_pipe_menu_cache:get_menu(),
+            stop(WatcherPid),
+            stop(CachePid),
+            ?assert(binary:match(Menu, <<"Bar">>) =/= nomatch)
+        end
+    ),
+    ok = rm_rf(Root),
+    restore_env(xdg_pipe_menu, debounce_ms, PrevDebounce).
+
+%% -- helpers ----------------------------------------------------------------
+
+%% start_link/0 links the started process to us (the test process);
+%% unlink before killing it so the kill signal doesn't propagate back
+%% and take the test process down with it.
+stop(Pid) ->
+    unlink(Pid),
+    true = erlang:exit(Pid, kill).
+
+restore_env(App, Key, undefined) -> application:unset_env(App, Key);
+restore_env(App, Key, {ok, Value}) -> application:set_env(App, Key, Value).
+
+with_env(Vars, Fun) ->
+    Saved = [{Name, os:getenv(Name)} || {Name, _} <- Vars],
+    try
+        lists:foreach(fun({Name, Value}) -> set_env(Name, Value) end, Vars),
+        Fun()
+    after
+        lists:foreach(fun({Name, Value}) -> set_env(Name, Value) end, Saved)
+    end.
+
+set_env(Name, false) -> os:unsetenv(Name);
+set_env(Name, Value) -> os:putenv(Name, Value).
+
+write_desktop(Dir, FileName, Name, Exec) ->
+    ok = file:write_file(
+        filename:join(Dir, FileName),
+        iolist_to_binary(["[Desktop Entry]\nName=", Name, "\nExec=", Exec, "\n"])
+    ).
+
+mk_tmp_dir() ->
+    Path = filename:join(
+        test_tmp_dir(), "eunit-watcher-" ++ integer_to_list(erlang:unique_integer([positive]))
+    ),
+    ok = file:make_dir(Path),
+    Path.
+
+test_tmp_dir() ->
+    case os:getenv("TMPDIR") of
+        false -> "/tmp";
+        Dir -> Dir
+    end.
+
+rm_rf(Path) ->
+    case filelib:is_dir(Path) of
+        true ->
+            {ok, Entries} = file:list_dir(Path),
+            lists:foreach(fun(E) -> rm_rf(filename:join(Path, E)) end, Entries),
+            file:del_dir(Path);
+        false ->
+            file:delete(Path)
+    end.