Merge pull request #630 from ckipp01/enableTestExplorer

refactor: include a message when Test Explorer is not set for select commands

lua/metals.lua

@@ -508,11 +508,21 @@ M.toggle_setting = function(setting)
 end
 
 M.select_test_suite = function()
-  test_explorer.dap_select_test_suite()
+  local config = conf.get_config_cache()
+  if config and config.settings.metals.testUserInterface == "Test Explorer" then
+    test_explorer.dap_select_test_suite()
+  else
+    log.error_and_show(messages.enable_test_explorer)
+  end
 end
 
 M.select_test_case = function()
-  test_explorer.dap_select_test_case()
+  local config = conf.get_config_cache()
+  if config and config.settings.metals.testUserInterface == "Test Explorer" then
+    test_explorer.dap_select_test_case()
+  else
+    log.error_and_show(messages.enable_test_explorer)
+  end
 end
 
 M.open_new_github_issue = function()

lua/metals/messages.lua

@@ -63,4 +63,7 @@ You recieved a null response for the tree view.
 If you're using Scala 3, this is expected as it's not support yet.
 If you're using Scala 2, please create an issue for this in nvim-metals.]]
 
+M.enable_test_explorer = [[
+You can't use this command unless you have "Test Explorer" set as the value of testUserInterface in your config.
+You can read more about this in :h metals-nvim-dap.]]
 return M