1 files changed, 44 insertions, 0 deletions
diff --git a/spec/ruby/core/hash/delete_spec.rb b/spec/ruby/core/hash/delete_spec.rb
new file mode 100644
index 0000000000..a45b8cd171
--- /dev/null
+++ b/spec/ruby/core/hash/delete_spec.rb
@@ -0,0 +1,44 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "Hash#delete" do
+  it "removes the entry and returns the deleted value" do
+    h = { a: 5, b: 2 }
+    h.delete(:b).should == 2
+    h.should == { a: 5 }
+  end
+
+  it "calls supplied block if the key is not found" do
+    { a: 1, b: 10, c: 100 }.delete(:d) { 5 }.should == 5
+    Hash.new(:default).delete(:d) { 5 }.should == 5
+    Hash.new { :defualt }.delete(:d) { 5 }.should == 5
+  end
+
+  it "returns nil if the key is not found when no block is given" do
+    { a: 1, b: 10, c: 100 }.delete(:d).should == nil
+    Hash.new(:default).delete(:d).should == nil
+    Hash.new { :defualt }.delete(:d).should == nil
+  end
+
+  # MRI explicitly implements this behavior
+  it "allows removing a key while iterating" do
+    h = { a: 1, b: 2 }
+    visited = []
+    h.each_pair { |k,v|
+      visited << k
+      h.delete(k)
+    }
+    visited.should == [:a, :b]
+    h.should == {}
+  end
+
+  it "accepts keys with private #hash method" do
+    key = HashSpecs::KeyWithPrivateHash.new
+    { key => 5 }.delete(key).should == 5
+  end
+
+  it "raises a RuntimeError if called on a frozen instance" do
+    lambda { HashSpecs.frozen_hash.delete("foo")  }.should raise_error(RuntimeError)
+    lambda { HashSpecs.empty_frozen_hash.delete("foo") }.should raise_error(RuntimeError)
+  end
+end