move tmux config into tmux subdirectory

tmux/plugins/tpm/tests/expect_failed_plugin_download

@@ -0,0 +1,36 @@
+#!/usr/bin/env expect
+
+# disables script output
+log_user 0
+
+spawn tmux
+
+# Waiting for tmux to attach. If this is not done, next command, `send` will
+# not work properly.
+sleep 1
+
+# this is tmux prefix + I
+send "I"
+
+# cloning might take a while
+set timeout 20
+
+expect_after {
+  timeout { exit 1 }
+}
+
+expect {
+  "Installing \"non-existing-plugin\""
+}
+
+expect {
+  "\"non-existing-plugin\" download fail"
+}
+
+expect {
+  "Done, press ENTER to continue" {
+    exit 0
+  }
+}
+
+exit 1