1 files changed, 74 insertions, 0 deletions
diff --git a/spec/rubyspec/core/enumerator/lazy/zip_spec.rb b/spec/rubyspec/core/enumerator/lazy/zip_spec.rb
new file mode 100644
index 0000000000..9c728364ce
--- /dev/null
+++ b/spec/rubyspec/core/enumerator/lazy/zip_spec.rb
@@ -0,0 +1,74 @@
+# -*- encoding: us-ascii -*-
+
+require File.expand_path('../../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "Enumerator::Lazy#zip" 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 "returns a new instance of Enumerator::Lazy" do
+    ret = @yieldsmixed.zip []
+    ret.should be_an_instance_of(Enumerator::Lazy)
+    ret.should_not equal(@yieldsmixed)
+  end
+
+  it "keeps size" do
+    Enumerator::Lazy.new(Object.new, 100) {}.zip([], []).size.should == 100
+  end
+
+  describe "when the returned lazy enumerator is evaluated by Enumerable#first" do
+    it "stops after specified times" do
+      (0..Float::INFINITY).lazy.zip([4, 5], [8]).first(2).should == [[0, 4, 8], [1, 5, nil]]
+
+      @eventsmixed.zip([0, 1]).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.zip(EnumeratorLazySpecs::YieldsMixed.new.to_enum).force
+    yields.should == [EnumeratorLazySpecs::YieldsMixed.gathered_yields,
+                      EnumeratorLazySpecs::YieldsMixed.gathered_yields].transpose
+  end
+
+  it "returns a Lazy when no arguments given" do
+    @yieldsmixed.zip.should be_an_instance_of(Enumerator::Lazy)
+  end
+
+  it "raises a TypeError if arguments contain non-list object" do
+    lambda { @yieldsmixed.zip [], Object.new, [] }.should raise_error(TypeError)
+  end
+
+  describe "on a nested Lazy" do
+    it "keeps size" do
+      Enumerator::Lazy.new(Object.new, 100) {}.map {}.zip([], []).size.should == 100
+    end
+
+    it "behaves as Enumerable#zip when given a block" do
+      lazy_yields = []
+      lazy_ret = @yieldsmixed.zip(EnumeratorLazySpecs::YieldsMixed.new.to_enum) { |lists| lazy_yields << lists }
+      enum_yields = []
+      enum_ret = EnumeratorLazySpecs::YieldsMixed.new.to_enum.zip(EnumeratorLazySpecs::YieldsMixed.new.to_enum) { |lists| enum_yields << lists }
+
+      lazy_yields.should == enum_yields
+      lazy_ret.should == enum_ret
+    end
+
+    describe "when the returned lazy enumerator is evaluated by Enumerable#first" do
+      it "stops after specified times" do
+        (0..Float::INFINITY).lazy.map(&:succ).zip([4, 5], [8]).first(2).should == [[1, 4, 8], [2, 5, nil]]
+
+        @eventsmixed.zip([0, 1]).zip([0, 1]).first(1)
+        ScratchPad.recorded.should == [:before_yield]
+      end
+    end
+  end
+end