1 files changed, 44 insertions, 0 deletions
diff --git a/spec/ruby/core/hash/delete_if_spec.rb b/spec/ruby/core/hash/delete_if_spec.rb
new file mode 100644
index 0000000000..3090633d88
--- /dev/null
+++ b/spec/ruby/core/hash/delete_if_spec.rb
@@ -0,0 +1,44 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/iteration'
+require_relative '../enumerable/shared/enumeratorized'
+
+describe "Hash#delete_if" do
+  it "yields two arguments: key and value" do
+    all_args = []
+    { 1 => 2, 3 => 4 }.delete_if { |*args| all_args << args }
+    all_args.sort.should == [[1, 2], [3, 4]]
+  end
+
+  it "removes every entry for which block is true and returns self" do
+    h = { a: 1, b: 2, c: 3, d: 4 }
+    h.delete_if { |k,v| v % 2 == 1 }.should.equal?(h)
+    h.should == { b: 2, d: 4 }
+  end
+
+  it "removes all entries if the block is true" do
+    h = { a: 1, b: 2, c: 3 }
+    h.delete_if { |k,v| true }.should.equal?(h)
+    h.should == {}
+  end
+
+  it "processes entries with the same order as each()" do
+    h = { a: 1, b: 2, c: 3, d: 4 }
+
+    each_pairs = []
+    delete_pairs = []
+
+    h.each_pair { |k,v| each_pairs << [k, v] }
+    h.delete_if { |k,v| delete_pairs << [k,v] }
+
+    each_pairs.should == delete_pairs
+  end
+
+  it "raises a FrozenError if called on a frozen instance" do
+    -> { HashSpecs.frozen_hash.delete_if { false } }.should.raise(FrozenError)
+    -> { HashSpecs.empty_frozen_hash.delete_if { true } }.should.raise(FrozenError)
+  end
+
+  it_behaves_like :hash_iteration_no_block, :delete_if
+  it_behaves_like :enumeratorized_with_origin_size, :delete_if, { 1 => 2, 3 => 4, 5 => 6 }
+end