1 files changed, 23 insertions, 0 deletions
diff --git a/spec/ruby/core/hash/deconstruct_keys_spec.rb b/spec/ruby/core/hash/deconstruct_keys_spec.rb
new file mode 100644
index 0000000000..f6ff3a2818
--- /dev/null
+++ b/spec/ruby/core/hash/deconstruct_keys_spec.rb
@@ -0,0 +1,23 @@
+require_relative '../../spec_helper'
+
+describe "Hash#deconstruct_keys" do
+  it "returns self" do
+    hash = {a: 1, b: 2}
+
+    hash.deconstruct_keys([:a, :b]).should.equal? hash
+  end
+
+  it "requires one argument" do
+    -> {
+      {a: 1}.deconstruct_keys
+    }.should.raise(ArgumentError, /wrong number of arguments \(given 0, expected 1\)/)
+  end
+
+  it "ignores argument" do
+    hash = {a: 1, b: 2}
+
+    hash.deconstruct_keys([:a]).should == {a: 1, b: 2}
+    hash.deconstruct_keys(0   ).should == {a: 1, b: 2}
+    hash.deconstruct_keys(''  ).should == {a: 1, b: 2}
+  end
+end