1 files changed, 86 insertions, 0 deletions
diff --git a/spec/rubyspec/core/enumerator/lazy/grep_v_spec.rb b/spec/rubyspec/core/enumerator/lazy/grep_v_spec.rb
new file mode 100644
index 0000000000..06dd42213c
--- /dev/null
+++ b/spec/rubyspec/core/enumerator/lazy/grep_v_spec.rb
@@ -0,0 +1,86 @@
+require File.expand_path('../../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+ruby_version_is "2.3" do
+  describe "Enumerator::Lazy#grep_v" do
+    before(:each) do
+      @yieldsmixed = EnumeratorLazySpecs::YieldsMixed.new.to_enum.lazy
+      @eventsmixed = EnumeratorLazySpecs::EventsMixed.new.to_enum.lazy
+      ScratchPad.record []
+    end
+
+    after(:each) do
+      ScratchPad.clear
+    end
+
+    it "requires an argument" do
+      Enumerator::Lazy.instance_method(:grep_v).arity.should == 1
+    end
+
+    it "returns a new instance of Enumerator::Lazy" do
+      ret = @yieldsmixed.grep_v(Object) {}
+      ret.should be_an_instance_of(Enumerator::Lazy)
+      ret.should_not equal(@yieldsmixed)
+
+      ret = @yieldsmixed.grep_v(Object)
+      ret.should be_an_instance_of(Enumerator::Lazy)
+      ret.should_not equal(@yieldsmixed)
+    end
+
+    it "sets #size to nil" do
+      Enumerator::Lazy.new(Object.new, 100) {}.grep_v(Object) {}.size.should == nil
+      Enumerator::Lazy.new(Object.new, 100) {}.grep_v(Object).size.should == nil
+    end
+
+    describe "when the returned lazy enumerator is evaluated by Enumerable#first" do
+      it "stops after specified times when not given a block" do
+        (0..Float::INFINITY).lazy.grep_v(3..5).first(3).should == [0, 1, 2]
+
+        @eventsmixed.grep_v(Symbol).first(1)
+        ScratchPad.recorded.should == [:before_yield]
+      end
+
+      it "stops after specified times when given a block" do
+        (0..Float::INFINITY).lazy.grep_v(4..8, &:succ).first(3).should == [1, 2, 3]
+
+        @eventsmixed.grep_v(Symbol) {}.first(1)
+        ScratchPad.recorded.should == [:before_yield]
+      end
+    end
+
+    it "calls the block with a gathered array when yield with multiple arguments" do
+      yields = []
+      @yieldsmixed.grep_v(Array) { |v| yields << v }.force
+      yields.should == EnumeratorLazySpecs::YieldsMixed.gathered_non_array_yields
+
+      @yieldsmixed.grep_v(Array).force.should == yields
+    end
+
+    describe "on a nested Lazy" do
+      it "sets #size to nil" do
+        Enumerator::Lazy.new(Object.new, 100) {}.grep_v(Object).grep_v(Object) {}.size.should == nil
+        Enumerator::Lazy.new(Object.new, 100) {}.grep_v(Object).grep_v(Object).size.should == nil
+      end
+
+      describe "when the returned lazy enumerator is evaluated by Enumerable#first" do
+       it "stops after specified times when not given a block" do
+          (0..Float::INFINITY).lazy.grep_v(3..5).grep_v(6..10).first(3).should == [0, 1, 2]
+
+          @eventsmixed.grep_v(Symbol).grep_v(String).first(1)
+          ScratchPad.recorded.should == [:before_yield]
+        end
+
+        it "stops after specified times when given a block" do
+          (0..Float::INFINITY).lazy
+            .grep_v(1..2) { |n| n > 3 ? n : false }
+            .grep_v(false) { |n| n.even? ? n : false }
+            .first(3)
+            .should == [4, false, 6]
+
+          @eventsmixed.grep_v(Symbol) {}.grep_v(String) {}.first(1)
+          ScratchPad.recorded.should == [:before_yield]
+        end
+      end
+    end
+  end
+end