1 files changed, 56 insertions, 0 deletions
diff --git a/tests/fixtures/display-lifecycle.js b/tests/fixtures/display-lifecycle.js
new file mode 100644
index 0000000..2173c47
--- /dev/null
+++ b/tests/fixtures/display-lifecycle.js
@@ -0,0 +1,56 @@
+import assert from 'node:assert/strict';
+
+class Extension {}
+const Meta = {MonitorSwitchConfigType: {EXTERNAL: 2}};
+let callback;
+let requests = 0;
+let switchable = true;
+let builtinOn = true;
+const manager = {
+    has_builtin_panel: true,
+    connect(signal, handler) {
+        assert.equal(signal, 'monitors-changed');
+        callback = handler;
+        return 1;
+    },
+    disconnect(id) {
+        assert.equal(id, 1);
+        callback = null;
+    },
+    can_switch_config: () => switchable,
+    get_is_builtin_display_on: () => builtinOn,
+    switch_config(type) {
+        assert.equal(type, Meta.MonitorSwitchConfigType.EXTERNAL);
+        requests++;
+        builtinOn = false;
+    },
+};
+globalThis.global = {backend: {get_monitor_manager: () => manager}};
+
+// EXTENSION
+
+const extension = new ExternalDisplay();
+extension.enable();
+assert.equal(requests, 1);
+callback();
+assert.equal(requests, 1);
+
+// One connected display, or a closed lid, prevents switching.
+switchable = false;
+builtinOn = true;
+callback();
+assert.equal(requests, 1);
+switchable = true;
+callback();
+assert.equal(requests, 2);
+
+manager.has_builtin_panel = false;
+builtinOn = true;
+callback();
+assert.equal(requests, 2);
+extension.disable();
+assert.equal(callback, null);
+manager.has_builtin_panel = true;
+extension.enable();
+assert.equal(requests, 3);
+extension.disable();