Add initial tests that run Jim's "checks"

tests/check_test.rb

@@ -0,0 +1,26 @@
+require_relative "test_helper"
+
+class CheckTest < Minitest::Test
+  def with_captured_stdout
+    original_stdout = $stdout
+    $stdout = StringIO.new
+    yield
+    $stdout.string
+  ensure
+    $stdout = original_stdout
+  end
+
+  def test_check_asserts
+    output = with_captured_stdout do
+      Rake::Task['check:asserts'].invoke
+    end
+    assert_match(/OK/, output)
+  end
+
+  def test_check_abouts
+    output = with_captured_stdout do
+      Rake::Task['check:abouts'].invoke
+    end
+    assert_match(/OK/, output)
+  end
+end