1 files changed, 19 insertions, 0 deletions
diff --git a/mrbgems/mruby-enum-ext/test/enum.rb b/mrbgems/mruby-enum-ext/test/enum.rb
index 5fc9759ad..aa56cdf84 100644
--- a/mrbgems/mruby-enum-ext/test/enum.rb
+++ b/mrbgems/mruby-enum-ext/test/enum.rb
@@ -23,3 +23,22 @@ assert("Enumerable#take_while") do
   assert_equal a.take_while {|i| i < 3 }, [1, 2]
 end
 
+assert("Enumerable#each_cons") do
+  a = []
+  (1..5).each_cons(3){|e| a << e}
+  assert_equal a, [[1, 2, 3], [2, 3, 4], [3, 4, 5]]
+end
+
+assert("Enumerable#each_slice") do
+  a = []
+  (1..10).each_slice(3){|e| a << e}
+  assert_equal  a, [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10]]
+end
+
+assert("Enumerable#group_by") do
+  r = (1..6).group_by {|i| i % 3 }
+  assert_equal r[0], [3, 6]
+  assert_equal r[1], [1, 4]
+  assert_equal r[2], [2, 5]
+end
+