1 files changed, 34 insertions, 0 deletions
diff --git a/mrbgems/mruby-hash-ext/test/hash.rb b/mrbgems/mruby-hash-ext/test/hash.rb
index 83a064811..4c7dbb217 100644
--- a/mrbgems/mruby-hash-ext/test/hash.rb
+++ b/mrbgems/mruby-hash-ext/test/hash.rb
@@ -39,3 +39,37 @@ assert('Hash#fetch') do
     assert_kind_of(StandardError, e);
   end
 end
+
+assert("Hash#delete_if") do
+  base = { 1 => 'one', 2 => false, true => 'true', 'cat' => 99 }
+  h1   = { 1 => 'one', 2 => false, true => 'true' }
+  h2   = { 2 => false, 'cat' => 99 }
+  h3   = { 2 => false }
+
+  h = base.dup
+  assert_equal(h, h.delete_if { false })
+  assert_equal({}, h.delete_if { true })
+
+  h = base.dup
+  assert_equal(h1, h.delete_if {|k,v| k.instance_of?(String) })
+  assert_equal(h1, h)
+
+  h = base.dup
+  assert_equal(h2, h.delete_if {|k,v| v.instance_of?(String) })
+  assert_equal(h2, h)
+
+  h = base.dup
+  assert_equal(h3, h.delete_if {|k,v| v })
+  assert_equal(h3, h)
+
+  h = base.dup
+  n = 0
+  h.delete_if {|*a|
+    n += 1
+    assert_equal(2, a.size)
+    assert_equal(base[a[0]], a[1])
+    h.shift
+    true
+  }
+  assert_equal(base.size, n)
+end