Add specs for Enumerator::Lazy#grep_v

Author: ahmadsherif

core/enumerator/lazy/fixtures/classes.rb

@@ -12,6 +12,10 @@ def self.gathered_yields
       [nil, 0, [0, 1], [0, 1, 2], [0, 1, 2], nil, :default_arg, [], [], [0], [0, 1], [0, 1, 2]]
     end
 
+    def self.gathered_non_array_yields
+      [nil, 0, nil, :default_arg]
+    end
+
     def self.gathered_yields_with_args(arg, *args)
       [nil, 0, [0, 1], [0, 1, 2], [0, 1, 2], nil, arg, args, [], [0], [0, 1], [0, 1, 2]]
     end

core/enumerator/lazy/grep_v_spec.rb

@@ -0,0 +1,84 @@
+require File.expand_path('../../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+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_class::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_class::Lazy)
+    ret.should_not equal(@yieldsmixed)
+
+    ret = @yieldsmixed.grep_v(Object)
+    ret.should be_an_instance_of(enumerator_class::Lazy)
+    ret.should_not equal(@yieldsmixed)
+  end
+
+  it "sets nil to size" do
+    enumerator_class::Lazy.new(Object.new, 100) {}.grep_v(Object) {}.size.should == nil
+    enumerator_class::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 nil to size" do
+      enumerator_class::Lazy.new(Object.new, 100) {}.grep_v(Object).grep_v(Object) {}.size.should == nil
+      enumerator_class::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