chore: default adapter to tesla default (#43)

Author: cjbell

lib/knock/client.ex

@@ -36,7 +36,23 @@ defmodule Knock.Client do
       raise Knock.ApiKeyMissingError
     end
 
-    opts = Keyword.take(opts, [:host, :api_key, :adapter, :json_client])
+    opts =
+      opts
+      |> Keyword.take([:host, :api_key, :adapter, :json_client])
+      |> Map.new()
+      |> maybe_set_adapter_default()
+
     struct!(__MODULE__, opts)
   end
+
+  defp maybe_set_adapter_default(%{adapter: adapter} = opts) when not is_nil(adapter),
+    do: opts
+
+  defp maybe_set_adapter_default(opts) do
+    # Use the default adapter if one is not provided (if set using Tesla)
+    case Application.get_env(:tesla, :adapter) do
+      default when not is_nil(default) -> Map.put(opts, :adapter, default)
+      _ -> opts
+    end
+  end
 end

test/knock_test.exs

@@ -34,5 +34,19 @@ defmodule KnockTest do
 
       assert knock.api_key == "sk_test_12345"
     end
+
+    test "if set, will use the Tesla default adapter if one is not provided" do
+      Application.put_env(:tesla, :adapter, Tesla.Adapter.Hackney)
+
+      knock = TestClient.client()
+      assert knock.adapter == Tesla.Adapter.Hackney
+
+      Application.delete_env(:tesla, :adapter)
+    end
+
+    test "it can set the adapter to a custom one" do
+      knock = TestClient.client(adapter: Tesla.Adapter.Mint)
+      assert knock.adapter == Tesla.Adapter.Mint
+    end
   end
 end