1 files changed, 76 insertions, 0 deletions
diff --git a/spec/ruby/core/hash/shared/update.rb b/spec/ruby/core/hash/shared/update.rb
new file mode 100644
index 0000000000..6dbad1d6d0
--- /dev/null
+++ b/spec/ruby/core/hash/shared/update.rb
@@ -0,0 +1,76 @@
+describe :hash_update, shared: true do
+  it "adds the entries from other, overwriting duplicate keys. Returns self" do
+    h = { _1: 'a', _2: '3' }
+    h.send(@method, _1: '9', _9: 2).should.equal?(h)
+    h.should == { _1: "9", _2: "3", _9: 2 }
+  end
+
+  it "sets any duplicate key to the value of block if passed a block" do
+    h1 = { a: 2, b: -1 }
+    h2 = { a: -2, c: 1 }
+    h1.send(@method, h2) { |k,x,y| 3.14 }.should.equal?(h1)
+    h1.should == { c: 1, b: -1, a: 3.14 }
+
+    h1.send(@method, h1) { nil }
+    h1.should == { a: nil, b: nil, c: nil }
+  end
+
+  it "tries to convert the passed argument to a hash using #to_hash" do
+    obj = mock('{1=>2}')
+    obj.should_receive(:to_hash).and_return({ 1 => 2 })
+    { 3 => 4 }.send(@method, obj).should == { 1 => 2, 3 => 4 }
+  end
+
+  it "does not call to_hash on hash subclasses" do
+    { 3 => 4 }.send(@method, HashSpecs::ToHashHash[1 => 2]).should == { 1 => 2, 3 => 4 }
+  end
+
+  it "processes entries with same order as merge()" do
+    h = { 1 => 2, 3 => 4, 5 => 6, "x" => nil, nil => 5, [] => [] }
+    merge_bang_pairs = []
+    merge_pairs = []
+    h.merge(h) { |*arg| merge_pairs << arg }
+    h.send(@method, h) { |*arg| merge_bang_pairs << arg }
+    merge_bang_pairs.should == merge_pairs
+  end
+
+  it "raises a FrozenError on a frozen instance that is modified" do
+    -> do
+      HashSpecs.frozen_hash.send(@method, 1 => 2)
+    end.should.raise(FrozenError)
+  end
+
+  it "checks frozen status before coercing an object with #to_hash" do
+    obj = mock("to_hash frozen")
+    # This is necessary because mock cleanup code cannot run on the frozen
+    # object.
+    def obj.to_hash() raise Exception, "should not receive #to_hash" end
+    obj.freeze
+
+    -> { HashSpecs.frozen_hash.send(@method, obj) }.should.raise(FrozenError)
+  end
+
+  # see redmine #1571
+  it "raises a FrozenError on a frozen instance that would not be modified" do
+    -> do
+      HashSpecs.frozen_hash.send(@method, HashSpecs.empty_frozen_hash)
+    end.should.raise(FrozenError)
+  end
+
+  it "does not raise an exception if changing the value of an existing key during iteration" do
+    hash = {1 => 2, 3 => 4, 5 => 6}
+    hash2 = {1 => :foo, 3 => :bar}
+    hash.each { hash.send(@method, hash2) }
+    hash.should == {1 => :foo, 3 => :bar, 5 => 6}
+  end
+
+  it "accepts multiple hashes" do
+    result = { a: 1 }.send(@method, { b: 2 }, { c: 3 }, { d: 4 })
+    result.should == { a: 1, b: 2, c: 3, d: 4 }
+  end
+
+  it "accepts zero arguments" do
+    hash = { a: 1 }
+    hash.send(@method).should.eql?(hash)
+  end
+end