test: captures log only when really necessary

test/tower_rollbar_test.exs

@@ -2,6 +2,8 @@ defmodule TowerRollbarTest do
   use ExUnit.Case
   doctest TowerRollbar
 
+  import ExUnit.CaptureLog, only: [capture_log: 1]
+
   setup do
     bypass = Bypass.open()
 
@@ -19,7 +21,6 @@ defmodule TowerRollbarTest do
     {:ok, bypass: bypass}
   end
 
-  @tag capture_log: true
   test "reports arithmetic error when a Plug.Conn NOT present", %{bypass: bypass} do
     # ref message synchronization trick copied from
     # https://github.com/PSPDFKit-labs/bypass/issues/112
@@ -54,7 +55,7 @@ defmodule TowerRollbarTest do
           "method" =>
             ~s(anonymous fn/0 in TowerRollbarTest."test reports arithmetic error when a Plug.Conn NOT present"/1),
           "filename" => "test/tower_rollbar_test.exs",
-          "lineno" => 69
+          "lineno" => 71
         } = List.last(frames)
       )
 
@@ -65,14 +66,15 @@ defmodule TowerRollbarTest do
       |> Plug.Conn.resp(200, Jason.encode!(%{"ok" => true}))
     end)
 
-    in_unlinked_process(fn ->
-      1 / 0
+    capture_log(fn ->
+      in_unlinked_process(fn ->
+        1 / 0
+      end)
     end)
 
     assert_receive({^ref, :sent}, 500)
   end
 
-  @tag capture_log: true
   test "reports arithmetic error when a Plug.Conn IS present with Plug.Cowboy", %{bypass: bypass} do
     # ref message synchronization trick copied from
     # https://github.com/PSPDFKit-labs/bypass/issues/112
@@ -130,12 +132,13 @@ defmodule TowerRollbarTest do
       {Plug.Cowboy, plug: TowerRollbar.ErrorTestPlug, scheme: :http, port: plug_port}
     )
 
-    {:ok, _response} = :httpc.request(:get, {url, [{~c"user-agent", "httpc client"}]}, [], [])
+    capture_log(fn ->
+      {:ok, _response} = :httpc.request(:get, {url, [{~c"user-agent", "httpc client"}]}, [], [])
+    end)
 
     assert_receive({^ref, :sent}, 500)
   end
 
-  @tag capture_log: true
   test "reports arithmetic error when a Plug.Conn IS present with Bandit", %{bypass: bypass} do
     # ref message synchronization trick copied from
     # https://github.com/PSPDFKit-labs/bypass/issues/112
@@ -189,9 +192,13 @@ defmodule TowerRollbarTest do
       |> Plug.Conn.resp(200, Jason.encode!(%{"ok" => true}))
     end)
 
-    start_supervised!({Bandit, plug: TowerRollbar.ErrorTestPlug, scheme: :http, port: plug_port})
+    capture_log(fn ->
+      start_supervised!(
+        {Bandit, plug: TowerRollbar.ErrorTestPlug, scheme: :http, port: plug_port}
+      )
 
-    {:ok, _response} = :httpc.request(:get, {url, [{~c"user-agent", "httpc client"}]}, [], [])
+      {:ok, _response} = :httpc.request(:get, {url, [{~c"user-agent", "httpc client"}]}, [], [])
+    end)
 
     assert_receive({^ref, :sent}, 500)
   end