Update to ruby/spec@83063a3

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62094 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

spec/ruby/core/thread/fetch_spec.rb

@@ -0,0 +1,38 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+ruby_version_is '2.5' do
+  describe 'Thread#fetch' do
+    describe 'with 2 arguments' do
+      it 'returns the value of the fiber-local variable if value has been assigned' do
+        th = Thread.new { Thread.current[:cat] = 'meow' }
+        th.join
+        th.fetch(:cat, true).should == 'meow'
+      end
+
+      it "returns the default value if fiber-local variable hasn't been assigned" do
+        th = Thread.new {}
+        th.join
+        th.fetch(:cat, true).should == true
+      end
+    end
+
+    describe 'with 1 argument' do
+      it 'raises a KeyError when the Thread does not have a fiber-local variable of the same name' do
+        th = Thread.new {}
+        th.join
+        -> { th.fetch(:cat) }.should raise_error(KeyError)
+      end
+
+      it 'returns the value of the fiber-local variable if value has been assigned' do
+        th = Thread.new { Thread.current[:cat] = 'meow' }
+        th.join
+        th.fetch(:cat).should == 'meow'
+      end
+    end
+
+    it 'raises an ArgumentError when not passed one or two arguments' do
+      -> { Thread.current.fetch() }.should raise_error(ArgumentError)
+      -> { Thread.current.fetch(1, 2, 3) }.should raise_error(ArgumentError)
+    end
+  end
+end