3 files changed, 27 insertions, 1 deletions
diff --git a/spec/ruby/core/hash/constructor_spec.rb b/spec/ruby/core/hash/constructor_spec.rb
index d32117b5a1..14674a018b 100644
--- a/spec/ruby/core/hash/constructor_spec.rb
+++ b/spec/ruby/core/hash/constructor_spec.rb
@@ -54,7 +54,7 @@ describe "Hash.[]" do
   end
 
   ruby_version_is "2.7" do
-    it "ignores elements that are not arrays" do
+    it "raises for elements that are not arrays" do
       -> {
         Hash[[:a]].should == {}
       }.should raise_error(ArgumentError)
diff --git a/spec/ruby/core/hash/hash_spec.rb b/spec/ruby/core/hash/hash_spec.rb
index 7c26f02640..3649d4d8de 100644
--- a/spec/ruby/core/hash/hash_spec.rb
+++ b/spec/ruby/core/hash/hash_spec.rb
@@ -11,6 +11,14 @@ describe "Hash#hash" do
     { 0=>2, 11=>1 }.hash.should == { 11=>1, 0=>2 }.hash
   end
 
+  it "returns a value in which element values do not cancel each other out" do
+    { a: 2, b: 2 }.hash.should_not == { a: 7, b: 7 }.hash
+  end
+
+  it "returns a value in which element keys and values do not cancel each other out" do
+    { :a => :a }.hash.should_not == { :b => :b }.hash
+  end
+
   it "generates a hash for recursive hash structures" do
     h = {}
     h[:a] = h
diff --git a/spec/ruby/core/hash/merge_spec.rb b/spec/ruby/core/hash/merge_spec.rb
index e90beae87a..54abcb816d 100644
--- a/spec/ruby/core/hash/merge_spec.rb
+++ b/spec/ruby/core/hash/merge_spec.rb
@@ -63,6 +63,24 @@ describe "Hash#merge" do
     merge_pairs.should == each_pairs
   end
 
+  it "preserves the order of merged elements" do
+    h1 = { 1 => 2, 3 => 4, 5 => 6 }
+    h2 = { 1 => 7 }
+    merge_pairs = []
+    h1.merge(h2).each_pair { |k, v| merge_pairs << [k, v] }
+    merge_pairs.should == [[1,7], [3, 4], [5, 6]]
+  end
+
+  it "preserves the order of merged elements for large hashes" do
+    h1 = {}
+    h2 = {}
+    merge_pairs = []
+    expected_pairs = []
+    (1..100).each { |x| h1[x] = x; h2[101 - x] = x; expected_pairs << [x, 101 - x] }
+    h1.merge(h2).each_pair { |k, v| merge_pairs << [k, v] }
+    merge_pairs.should == expected_pairs
+  end
+
   ruby_version_is "2.6" do
     it "accepts multiple hashes" do
       result = { a: 1 }.merge({ b: 2 }, { c: 3 }, { d: 4 })