diff --git a/instrumentation/opentelemetry_phoenix/test/integration_test.exs b/instrumentation/opentelemetry_phoenix/test/integration_test.exs
index dbc18179..eb95a99f 100644
--- a/instrumentation/opentelemetry_phoenix/test/integration_test.exs
+++ b/instrumentation/opentelemetry_phoenix/test/integration_test.exs
@@ -170,8 +170,7 @@ if otp_vsn >= 27 do
       }
 
       on_exit(fn ->
-        :telemetry.list_handlers([])
-        |> Enum.each(fn h -> :telemetry.detach(h.id) end)
+        Enum.each(:telemetry.list_handlers([]), &:telemetry.detach(&1.id))
       end)
 
       adapters
diff --git a/instrumentation/opentelemetry_phoenix/test/opentelemetry_phoenix_test.exs b/instrumentation/opentelemetry_phoenix/test/opentelemetry_phoenix_test.exs
index 273b4d4c..4db0a596 100644
--- a/instrumentation/opentelemetry_phoenix/test/opentelemetry_phoenix_test.exs
+++ b/instrumentation/opentelemetry_phoenix/test/opentelemetry_phoenix_test.exs
@@ -18,19 +18,18 @@ defmodule OpentelemetryPhoenixTest do
   end
 
   setup do
-    Application.ensure_all_started([:telemetry])
     :otel_simple_processor.set_exporter(:otel_exporter_pid, self())
 
+    OpentelemetryPhoenix.setup(adapter: :cowboy2)
+
     on_exit(fn ->
-      Application.stop(:telemetry)
+      Enum.each(:telemetry.list_handlers([]), &:telemetry.detach(&1.id))
     end)
 
     :ok
   end
 
   test "records spans for Phoenix LiveView mount" do
-    OpentelemetryPhoenix.setup(adapter: :cowboy2)
-
     :telemetry.execute(
       [:phoenix, :live_view, :mount, :start],
       %{system_time: System.system_time()},
@@ -53,8 +52,6 @@ defmodule OpentelemetryPhoenixTest do
   end
 
   test "records spans for Phoenix LiveView handle_params" do
-    OpentelemetryPhoenix.setup(adapter: :cowboy2)
-
     :telemetry.execute(
       [:phoenix, :live_view, :handle_params, :start],
       %{system_time: System.system_time()},
@@ -77,8 +74,6 @@ defmodule OpentelemetryPhoenixTest do
   end
 
   test "records spans for Phoenix LiveView handle_event" do
-    OpentelemetryPhoenix.setup(adapter: :cowboy2)
-
     :telemetry.execute(
       [:phoenix, :live_view, :handle_event, :start],
       %{system_time: System.system_time()},
@@ -101,8 +96,6 @@ defmodule OpentelemetryPhoenixTest do
   end
 
   test "handles exception during Phoenix LiveView handle_params" do
-    OpentelemetryPhoenix.setup(adapter: :cowboy2)
-
     :telemetry.execute(
       [:phoenix, :live_view, :mount, :start],
       %{system_time: System.system_time()},
@@ -160,8 +153,6 @@ defmodule OpentelemetryPhoenixTest do
   end
 
   test "handles exceptions during Phoenix LiveView handle_event" do
-    OpentelemetryPhoenix.setup(adapter: :cowboy2)
-
     :telemetry.execute(
       [:phoenix, :live_view, :handle_event, :start],
       %{system_time: System.system_time()},