test files renamed with test_ prefix

error tests added

Rakefile updated with new test file names

event tasks moved into :e namespace

test/obsws/test_attrs.rb

@@ -0,0 +1,17 @@
+require_relative "../minitest_helper"
+
+class AttrsTest < OBSWSTest
+  def test_get_version_attrs
+    resp = OBSWSTest.r_client.get_version
+    assert resp.attrs ==
+      %w[
+        available_requests
+        obs_version
+        obs_web_socket_version
+        platform
+        platform_description
+        rpc_version
+        supported_image_formats
+      ]
+  end
+end