Fixed available_plugins bug

Also added unit tests for `LiveViewNative`

lib/live_view_native.ex

@@ -115,7 +115,16 @@ defmodule LiveViewNative do
   end
 
   @doc"""
-  Returns a list of all available LiveView Nativ plugins
+  Fetches a plugin based upon the format name
+
+  Follows the same return types as `Map.fetch!/2`
+  """
+  def fetch_plugin!(format) do
+    Map.fetch!(plugins(), stringify_format(format))
+  end
+
+  @doc"""
+  Returns a list of all available LiveView Native plugins
 
   Only the plugins that have been registered in your application
   config will be returned in the list
@@ -144,13 +153,8 @@ defmodule LiveViewNative do
   The format list is derived from the plugins returned by `LiveViewNative.plugins/0`
   """
   def available_formats() do
-    case Application.fetch_env(:live_view_native, :plugins) do
-      {:ok, plugins} ->
-        Enum.map(plugins, &(&1.format))
-      :error ->
-        IO.warn("No LiveView Native plugins registered")
-
-        []
-    end
+    plugins()
+    |> Map.values()
+    |> Enum.map(&(&1.format))
   end
 end

test/live_view_native_test.exs

@@ -0,0 +1,41 @@
+defmodule LiveViewNative.Test do
+  use ExUnit.Case
+
+  alias LiveViewNativeTest.{GameBoy, Switch}
+
+  test "fetch_plugin/1" do
+    {:ok, plugin} = LiveViewNative.fetch_plugin(:gameboy)
+    assert plugin.format == :gameboy
+
+    {:ok, plugin} = LiveViewNative.fetch_plugin(:switch)
+    assert plugin.format == :switch
+
+    assert LiveViewNative.fetch_plugin(:other) == :error
+  end
+
+  test "fetch_plugin!/1" do
+    plugin = LiveViewNative.fetch_plugin!(:gameboy)
+    assert plugin.format == :gameboy
+
+    plugin = LiveViewNative.fetch_plugin!(:switch)
+    assert plugin.format == :switch
+
+    assert_raise KeyError, fn ->
+      LiveViewNative.fetch_plugin!(:other)
+    end
+  end
+
+  test "plugins/0" do
+    plugins = LiveViewNative.plugins()
+
+    assert %GameBoy{} = plugins["gameboy"]
+    assert %Switch{} = plugins["switch"]
+  end
+
+  test "available_formats/0" do
+    formats = LiveViewNative.available_formats()
+
+    assert Enum.member?(formats, :gameboy)
+    assert Enum.member?(formats, :switch)
+  end
+end