diff --git a/test/coverage/test_coverage.rb b/test/coverage/test_coverage.rb
new file mode 100644
index 0000000000..ace49d3282
--- /dev/null
+++ b/test/coverage/test_coverage.rb
@@ -0,0 +1,17 @@
+require "test/unit"
+require "coverage"
+
+class TestCoverage < Test::Unit::TestCase
+  def test_result_without_start
+    assert_raise(RuntimeError) {Coverage.result}
+  end
+  def test_result_with_nothing
+    Coverage.start
+    result = Coverage.result
+    assert_kind_of(Hash, result)
+    result.each do |key, val|
+      assert_kind_of(String, key)
+      assert_kind_of(Array, val)
+    end
+  end
+end