test: implement random test runner. (#489)

lib/spec/runners/random.ex

@@ -0,0 +1,37 @@
+defmodule RandomTestRunner do
+  @moduledoc """
+  Runner for random test cases. See: https://github.com/ethereum/consensus-specs/tree/dev/tests/formats/random
+  """
+
+  use ExUnit.CaseTemplate
+  use TestRunner
+
+  @disabled_cases [
+    "randomized_0",
+    # "randomized_1",
+    "randomized_2",
+    "randomized_3",
+    # "randomized_4",
+    "randomized_5",
+    "randomized_6",
+    "randomized_7",
+    # "randomized_8",
+    # "randomized_9",
+    "randomized_10",
+    # "randomized_11",
+    "randomized_12",
+    "randomized_13",
+    "randomized_14",
+    "randomized_15"
+  ]
+
+  @impl TestRunner
+  def skip?(%SpecTestCase{fork: "capella", case: testcase}) do
+    Enum.member?(@disabled_cases, testcase)
+  end
+
+  @impl TestRunner
+  def run_test_case(testcase) do
+    Helpers.ProcessBlocks.process_blocks(testcase)
+  end
+end