Tests non-existing plugin installation

tests/expect_failed_plugin_download

@@ -0,0 +1,41 @@
+#!/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 {
+    puts "Plugin installation timeout"
+    exit 1
+  }
+}
+
+expect {
+  "Installing \"non-existing-plugin\"" {
+
+    expect {
+      "\"non-existing-plugin\" download fail" {
+
+        expect {
+          "Done, press ENTER to continue" {
+            exit
+          }
+        }
+
+      }
+    }
+
+  }
+}

tests/helpers/tpm.sh

@@ -7,7 +7,7 @@ script_run_helper() {
 	local script="$1"
 	local expected_output="$2"
 	local expected_exit_code="${3:-0}"
-	$script |
+	$script 2>&1 |
 		grep "$expected_output" >/dev/null 2>&1 && # grep -q flag quits the script early
 		[ "${PIPESTATUS[0]}" -eq "$expected_exit_code" ]
 }

tests/test_plugin_installation.sh

@@ -44,6 +44,18 @@ test_plugin_installation_custom_dir_via_tmux_key_binding() {
 	rm -rf "$CUSTOM_PLUGINS_DIR"
 }
 
+test_non_existing_plugin_installation_via_tmux_key_binding() {
+	set_tmux_conf_helper <<- HERE
+	set -g @plugin "tmux-plugins/non-existing-plugin"
+	run-shell "$TPM_DIR/tpm"
+	HERE
+
+	"$CURRENT_DIR/expect_failed_plugin_download" ||
+		fail_helper "[key-binding] non existing plugin installation doesn't fail"
+
+	teardown_helper
+}
+
 test_multiple_plugins_installation_via_tmux_key_binding() {
 	set_tmux_conf_helper <<- HERE
 	set -g @plugin "tmux-plugins/tmux-example-plugin"
@@ -105,6 +117,19 @@ test_plugin_installation_custom_dir_via_script() {
 	rm -rf "$CUSTOM_PLUGINS_DIR"
 }
 
+test_non_existing_plugin_installation_via_script() {
+	set_tmux_conf_helper <<- HERE
+	set -g @plugin "tmux-plugins/non-existing-plugin"
+	run-shell "$TPM_DIR/tpm"
+	HERE
+
+	local expected_exit_code=1
+	script_run_helper "$TPM_DIR/bin/install_plugins" '"non-existing-plugin" download fail' "$expected_exit_code" ||
+		fail_helper "[script] non existing plugin installation doesn't fail"
+
+	teardown_helper
+}
+
 test_multiple_plugins_installation_via_script() {
 	set_tmux_conf_helper <<- HERE
 	set -g @plugin "tmux-plugins/tmux-example-plugin"