add first Elixir metric test

.github/workflows/elixir.yml

@@ -53,7 +53,7 @@ jobs:
       - name: Compile
         run: rebar3 as test compile
       - name: ExUnit
-        run: mix test --no-start test/otel_tests.exs
+        run: mix test --no-start test/otel_tests.exs test/otel_metric_tests.exs
 
   api_tests:
     runs-on: ${{ matrix.os }}

apps/opentelemetry_api_experimental/mix.exs

@@ -45,10 +45,6 @@ defmodule OpenTelemetryExperimental.MixProject do
   # Run "mix help compile.app" to learn about applications.
   def application, do: []
 
-  defp deps() do
-    [{:opentelemetry_api, path: "../opentelemetry_api/"}]
-  end
-
   defp deps(rebar) do
     rebar
     |> Enum.map(fn

mix.exs

@@ -15,7 +15,11 @@ defmodule OtelElixirTests.MixProject do
       {:opentelemetry, path: "apps/opentelemetry", only: :test, override: true},
       {:opentelemetry_api, path: "apps/opentelemetry_api", only: :test, override: true},
       {:opentelemetry_semantic_conventions,
-       path: "apps/opentelemetry_semantic_conventions", only: :test, override: true}
+       path: "apps/opentelemetry_semantic_conventions", only: :test, override: true},
+      {:opentelemetry_experimental,
+       path: "apps/opentelemetry_experimental", only: :test, override: true},
+      {:opentelemetry_api_experimental,
+       path: "apps/opentelemetry_api_experimental", only: :test, override: true}
     ]
   end
 

test/otel_metric_tests.exs

@@ -0,0 +1,38 @@
+defmodule OtelMetricTests do
+  use ExUnit.Case, async: true
+
+  require OpenTelemetryAPIExperimental.Counter, as: Counter
+
+  require Record
+  @fields Record.extract(:metric, from_lib: "opentelemetry_experimental/include/otel_metrics.hrl")
+  Record.defrecordp(:metric, @fields)
+
+  setup do
+    Application.load(:opentelemetry_experimental)
+
+    Application.put_env(:opentelemetry_experimental, :readers, [
+      %{
+        module: :otel_metric_reader,
+        config: %{
+          exporter: {:otel_metric_exporter_pid, {:metric, self()}}
+        }
+      }
+    ])
+
+    {:ok, _} = Application.ensure_all_started(:opentelemetry_experimental)
+
+    on_exit(fn ->
+      Application.stop(:opentelemetry_experimental)
+      Application.unload(:opentelemetry_experimental)
+    end)
+  end
+
+  test "create Counter with macros" do
+    Counter.create(:counter_a, %{unit: "1", description: "some counter_a"})
+    Counter.add(:counter_a, 1, [])
+
+    :otel_meter_server.force_flush()
+
+    assert_receive {:metric, metric(name: :counter_a)}
+  end
+end