Init git repo

test/matrix_server_web/views/error_view_test.exs

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+defmodule MatrixServerWeb.ErrorViewTest do
+  use MatrixServerWeb.ConnCase, async: true
+
+  # Bring render/3 and render_to_string/3 for testing custom views
+  import Phoenix.View
+
+  test "renders 404.json" do
+    assert render(MatrixServerWeb.ErrorView, "404.json", []) == %{errors: %{detail: "Not Found"}}
+  end
+
+  test "renders 500.json" do
+    assert render(MatrixServerWeb.ErrorView, "500.json", []) ==
+             %{errors: %{detail: "Internal Server Error"}}
+  end
+end