1 files changed, 66 insertions, 0 deletions
diff --git a/spec/ruby/core/enumerator/lazy/take_spec.rb b/spec/ruby/core/enumerator/lazy/take_spec.rb
new file mode 100644
index 0000000000..5ef732237d
--- /dev/null
+++ b/spec/ruby/core/enumerator/lazy/take_spec.rb
@@ -0,0 +1,66 @@
+# -*- encoding: us-ascii -*-
+
+require File.expand_path('../../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "Enumerator::Lazy#take" 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.take(1)
+    ret.should be_an_instance_of(Enumerator::Lazy)
+    ret.should_not equal(@yieldsmixed)
+  end
+
+  it "sets given count to size if the given count is less than old size" do
+    Enumerator::Lazy.new(Object.new, 100) {}.take(20).size.should == 20
+    Enumerator::Lazy.new(Object.new, 100) {}.take(200).size.should == 100
+  end
+
+  it "sets given count to size if the old size is Infinity" do
+    loop.lazy.take(20).size.should == 20
+  end
+
+  describe "when the returned lazy enumerator is evaluated by .force" do
+    it "stops after specified times" do
+      (0..Float::INFINITY).lazy.take(2).force.should == [0, 1]
+
+      @eventsmixed.take(1).force
+      ScratchPad.recorded.should == [:before_yield]
+    end
+
+    it "stops without iterations if the given argument is 0" do
+      @eventsmixed.take(0).force
+      ScratchPad.recorded.should == []
+    end
+  end
+
+  describe "on a nested Lazy" do
+    it "sets given count to size if the given count is less than old size" do
+      Enumerator::Lazy.new(Object.new, 100) {}.take(20).take(50).size.should == 20
+      Enumerator::Lazy.new(Object.new, 100) {}.take(50).take(20).size.should == 20
+    end
+
+    describe "when the returned lazy enumerator is evaluated by .force" do
+      it "stops after specified times" do
+        (0..Float::INFINITY).lazy.map(&:succ).take(2).force.should == [1, 2]
+
+        @eventsmixed.take(10).take(1).force
+        ScratchPad.recorded.should == [:before_yield]
+      end
+
+      it "stops without iterations if the given argument is 0" do
+        @eventsmixed.take(10).take(0).force
+        ScratchPad.recorded.should == []
+      end
+    end
+  end
+end