basic error handling test

test/error_handling_test.exs

@@ -1,8 +1,19 @@
 defmodule PlantIdDiscordBot.ErrorHandlingTest do
   use ExUnit.Case
+  import ExUnit.CaptureLog
 
-  test "do_identification/1 returns nil when an error occurs" do
+  @guild Application.compile_env(:plantid_discord_bot, :guild)
+
+  test "do_identification/1 returns invokes logger on error" do
     message = PlantNetFixtures.Message.message()
-    PlantIdDiscordBot.Cog.PlantNetMessage.do_identification(message)
+
+    log = capture_log(fn ->
+      PlantIdDiscordBot.Cog.PlantNetMessage.do_identification(message)
+
+      assert_received {:create_message, 123456, content: "An error has occured. Please try again later."}
+    end)
+
+      assert log =~ "guild_id=#{message.guild_id}"
+      assert log =~ "guild_name=#{@guild.get_guild_name!(message.guild_id)}"
   end
 end