fix: properly reports common :gen_server abnormal exits

lib/tower_rollbar/rollbar/item.ex

@@ -17,7 +17,7 @@ defmodule TowerRollbar.Rollbar.Item do
   end
 
   def from_event(%Tower.Event{kind: :exit, reason: reason, stacktrace: stacktrace} = event) do
-    trace("(exit)", reason, stacktrace, options_from_event(event))
+    trace("(exit)", Exception.format_exit(reason), stacktrace, options_from_event(event))
   end
 
   def from_event(%Tower.Event{kind: :message, level: level, reason: reason} = event) do

test/tower_rollbar_test.exs

@@ -127,7 +127,7 @@ defmodule TowerRollbarTest do
                 "trace" => %{
                   "exception" => %{
                     "class" => "(exit)",
-                    "message" => "abnormal"
+                    "message" => ":abnormal"
                   },
                   "frames" => frames
                 }
@@ -159,6 +159,55 @@ defmodule TowerRollbarTest do
     end)
   end
 
+  test "reports :gen_server bad exit", %{bypass: bypass} do
+    waiting_for(fn done ->
+      Bypass.expect_once(bypass, "POST", "/item", fn conn ->
+        {:ok, body, conn} = Plug.Conn.read_body(conn)
+
+        assert(
+          %{
+            "data" => %{
+              "uuid" => _,
+              "environment" => "test",
+              "timestamp" => _,
+              "level" => "error",
+              "body" => %{
+                "trace" => %{
+                  "exception" => %{
+                    "class" => "(exit)",
+                    "message" => "bad return value: \"bad value\""
+                  },
+                  "frames" => frames
+                }
+              }
+            }
+          } = Jason.decode!(body)
+        )
+
+        assert(
+          %{
+            "method" =>
+              ~s(anonymous fn/0 in TowerRollbarTest."test reports :gen_server bad exit"/1),
+            "filename" => "test/tower_rollbar_test.exs",
+            "lineno" => 204
+          } = List.last(frames)
+        )
+
+        done.()
+
+        conn
+        |> Plug.Conn.put_resp_content_type("application/json")
+        |> Plug.Conn.resp(200, Jason.encode!(%{"ok" => true}))
+      end)
+
+      capture_log(fn ->
+        in_unlinked_process(fn ->
+          exit({:bad_return_value, "bad value"})
+        end)
+      end)
+    end)
+  end
+
   test "error report includes request data when available via Plug.Cowboy", %{bypass: bypass} do
     # An ephemeral port hopefully not being in the host running this code
     plug_port = 51111
@@ -301,7 +350,7 @@ defmodule TowerRollbarTest do
                 "trace" => %{
                   "exception" => %{
                     "class" => "(exit)",
-                    "message" => "abnormal"
+                    "message" => ":abnormal"
                   },
                   # Plug.Cowboy doesn't provide stacktrace for exits
                   "frames" => []