add some tests and bump the release version

CHANGELOG.md

@@ -1,5 +1,11 @@
 # OpenTelemetryDecorator
 
+## v1.4.2
+
+- Bump opentelemetry_exporter from 1.4.1 to 1.5.0 by @dependabot in https://github.com/marcdel/open_telemetry_decorator/pull/111
+- Ensure that keys are strings before we call Span.set_attributes (https://github.com/marcdel/open_telemetry_decorator/issues/114)
+- Adds with_span decorator (delegates to trace, so you can use either)
+
 ## v1.4.1
 
 ### Features

config/dev.exs

@@ -1,3 +1 @@
 import Config
-
-config :opentelemetry, processors: [:otel_simple_processor]

mix.exs

@@ -1,7 +1,7 @@
 defmodule OpenTelemetryDecorator.MixProject do
   use Mix.Project
 
-  @version "1.4.1"
+  @version "1.4.2"
   @github_page "https://github.com/marcdel/open_telemetry_decorator"
 
   def project do

test/open_telemetry_decorator/attributes_test.exs

@@ -77,6 +77,36 @@ defmodule OpenTelemetryDecorator.AttributesTest do
     end
   end
 
+  describe "set prefixes attributes with the configured prefix" do
+    setup do
+      prev = Application.get_env(:open_telemetry_decorator, :attr_prefix)
+      Application.put_env(:open_telemetry_decorator, :attr_prefix, "app.")
+      on_exit(fn -> Application.put_env(:open_telemetry_decorator, :attr_prefix, prev) end)
+    end
+
+    test "when prefix is configured, prefixes attribute names" do
+      Tracer.with_span "important_stuff" do
+        Attributes.set(beep: "boop", count: 12)
+        Attributes.set(%{maths: 1.2, failed: true})
+        Attributes.set(:result, {:error, "too sick bro"})
+        Attributes.set(:color, "pink")
+      end
+
+      expected = %{
+        "app.beep": "boop",
+        "app.color": "pink",
+        "app.count": 12,
+        "app.failed": true,
+        "app.maths": 1.2,
+        "app.result": "{:error, \"too sick bro\"}"
+      }
+
+      assert_receive {:span, span(name: "important_stuff", attributes: attrs)}
+
+      assert get_span_attributes(attrs) == expected
+    end
+  end
+
   describe "get" do
     setup do
       prev = Application.get_env(:open_telemetry_decorator, :attr_joiner)

test/support/otel_helper.ex

@@ -14,7 +14,10 @@ defmodule OtelHelper do
         Application.load(:opentelemetry)
 
         Application.put_env(:opentelemetry, :processors, [
-          {:otel_batch_processor, %{scheduled_delay_ms: 1, exporter: {:otel_exporter_pid, self()}}}
+          {
+            :otel_batch_processor,
+            %{scheduled_delay_ms: 1, exporter: {:otel_exporter_pid, self()}}
+          }
         ])
 
         {:ok, _} = Application.ensure_all_started(:opentelemetry)