1 files changed, 43 insertions, 0 deletions
diff --git a/spec/ruby/core/enumerable/grep_v_spec.rb b/spec/ruby/core/enumerable/grep_v_spec.rb
new file mode 100644
index 0000000000..05c43a43ef
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+++ b/spec/ruby/core/enumerable/grep_v_spec.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+ruby_version_is "2.3" do
+  describe "Enumerable#grep_v" do
+    before :each do
+      @numerous = EnumerableSpecs::Numerous.new(*(0..9).to_a)
+      def (@odd_matcher = BasicObject.new).===(obj)
+        obj.odd?
+      end
+    end
+
+    describe "without block" do
+      it "returns an Array of matched elements" do
+        @numerous.grep_v(@odd_matcher).should == [0, 2, 4, 6, 8]
+      end
+
+      it "compares pattern with gathered array when yielded with multiple arguments" do
+        (unmatcher = Object.new).stub!(:===).and_return(false)
+        EnumerableSpecs::YieldsMixed2.new.grep_v(unmatcher).should == EnumerableSpecs::YieldsMixed2.gathered_yields
+      end
+
+      it "raises an ArgumentError when not given a pattern" do
+        -> { @numerous.grep_v }.should raise_error(ArgumentError)
+      end
+    end
+
+    describe "with block" do
+      it "returns an Array of matched elements that mapped by the block" do
+        @numerous.grep_v(@odd_matcher) { |n| n * 2 }.should == [0, 4, 8, 12, 16]
+      end
+
+      it "calls the block with gathered array when yielded with multiple arguments" do
+        (unmatcher = Object.new).stub!(:===).and_return(false)
+        EnumerableSpecs::YieldsMixed2.new.grep_v(unmatcher){ |e| e }.should == EnumerableSpecs::YieldsMixed2.gathered_yields
+      end
+
+      it "raises an ArgumentError when not given a pattern" do
+        -> { @numerous.grep_v { |e| e } }.should raise_error(ArgumentError)
+      end
+    end
+  end
+end