4 files changed, 238 insertions, 0 deletions
diff --git a/spec/ruby/core/enumerator/lazy/shared/collect.rb b/spec/ruby/core/enumerator/lazy/shared/collect.rb
new file mode 100644
index 0000000000..c892784bc2
--- /dev/null
+++ b/spec/ruby/core/enumerator/lazy/shared/collect.rb
@@ -0,0 +1,56 @@
+# -*- encoding: us-ascii -*-
+
+require File.expand_path('../../../../../spec_helper', __FILE__)
+require File.expand_path('../../fixtures/classes', __FILE__)
+
+describe :enumerator_lazy_collect, shared: true 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.send(@method) {}
+    ret.should be_an_instance_of(Enumerator::Lazy)
+    ret.should_not equal(@yieldsmixed)
+  end
+
+  it "keeps size" do
+    Enumerator::Lazy.new(Object.new, 100) {}.send(@method) {}.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.send(@method, &:succ).first(3).should == [1, 2, 3]
+
+      @eventsmixed.send(@method) {}.first(1)
+      ScratchPad.recorded.should == [:before_yield]
+    end
+  end
+
+  it "calls the block with initial values when yield with multiple arguments" do
+    yields = []
+    @yieldsmixed.send(@method) { |v| yields << v }.force
+    yields.should == EnumeratorLazySpecs::YieldsMixed.initial_yields
+  end
+
+  describe "on a nested Lazy" do
+    it "keeps size" do
+      Enumerator::Lazy.new(Object.new, 100) {}.send(@method) {}.send(@method) {}.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.send(@method, &:succ).send(@method, &:succ).first(3).should == [2, 3, 4]
+
+        @eventsmixed.send(@method) {}.send(@method) {}.first(1)
+        ScratchPad.recorded.should == [:before_yield]
+      end
+    end
+  end
+end
diff --git a/spec/ruby/core/enumerator/lazy/shared/collect_concat.rb b/spec/ruby/core/enumerator/lazy/shared/collect_concat.rb
new file mode 100644
index 0000000000..69bc10c1a4
--- /dev/null
+++ b/spec/ruby/core/enumerator/lazy/shared/collect_concat.rb
@@ -0,0 +1,72 @@
+# -*- encoding: us-ascii -*-
+
+require File.expand_path('../../../../../spec_helper', __FILE__)
+require File.expand_path('../../fixtures/classes', __FILE__)
+
+describe :enumerator_lazy_collect_concat, shared: true 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.send(@method) {}
+    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) {}.send(@method) { true }.size.should == nil
+  end
+
+  describe "when the returned lazy enumerator is evaluated by Enumerable#first" do
+    it "stops after specified times" do
+      (0..Float::INFINITY).lazy.send(@method) { |n| (n * 10).to_s }.first(6).should == %w[0 10 20 30 40 50]
+
+      @eventsmixed.send(@method) {}.first(1)
+      ScratchPad.recorded.should == [:before_yield]
+    end
+
+    it "flattens elements when the given block returned an array or responding to .each and .force" do
+      (0..Float::INFINITY).lazy.send(@method) { |n| (n * 10).to_s.chars }.first(6).should == %w[0 1 0 2 0 3]
+      (0..Float::INFINITY).lazy.send(@method) { |n| (n * 10).to_s.each_char }.first(6).all? { |o| o.instance_of? Enumerator }.should be_true
+      (0..Float::INFINITY).lazy.send(@method) { |n| (n * 10).to_s.each_char.lazy }.first(6).should == %w[0 1 0 2 0 3]
+    end
+  end
+
+  it "calls the block with initial values when yield with multiple arguments" do
+    yields = []
+    @yieldsmixed.send(@method) { |v| yields << v }.force
+    yields.should == EnumeratorLazySpecs::YieldsMixed.initial_yields
+  end
+
+  it "raises an ArgumentError when not given a block" do
+    lambda { @yieldsmixed.send(@method) }.should raise_error(ArgumentError)
+  end
+
+  describe "on a nested Lazy" do
+    it "sets #size to nil" do
+      Enumerator::Lazy.new(Object.new, 100) {}.take(50) {}.send(@method) {}.size.should == nil
+    end
+
+    describe "when the returned lazy enumerator is evaluated by Enumerable#first" do
+      it "stops after specified times" do
+        (0..Float::INFINITY).lazy.map {|n| n * 10 }.send(@method) { |n| n.to_s }.first(6).should == %w[0 10 20 30 40 50]
+
+        @eventsmixed.send(@method) {}.send(@method) {}.first(1)
+        ScratchPad.recorded.should == [:before_yield]
+      end
+
+      it "flattens elements when the given block returned an array or responding to .each and .force" do
+        (0..Float::INFINITY).lazy.map {|n| n * 10 }.send(@method) { |n| n.to_s.chars }.first(6).should == %w[0 1 0 2 0 3]
+        (0..Float::INFINITY).lazy.map {|n| n * 10 }.send(@method) { |n| n.to_s.each_char }.first(6).all? { |o| o.instance_of? Enumerator }.should be_true
+        (0..Float::INFINITY).lazy.map {|n| n * 10 }.send(@method) { |n| n.to_s.each_char.lazy }.first(6).should == %w[0 1 0 2 0 3]
+      end
+    end
+  end
+end
diff --git a/spec/ruby/core/enumerator/lazy/shared/select.rb b/spec/ruby/core/enumerator/lazy/shared/select.rb
new file mode 100644
index 0000000000..546256360e
--- /dev/null
+++ b/spec/ruby/core/enumerator/lazy/shared/select.rb
@@ -0,0 +1,60 @@
+# -*- encoding: us-ascii -*-
+
+require File.expand_path('../../../../../spec_helper', __FILE__)
+require File.expand_path('../../fixtures/classes', __FILE__)
+
+describe :enumerator_lazy_select, shared: true 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.send(@method) {}
+    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) {}.send(@method) { true }.size.should == nil
+  end
+
+  describe "when the returned lazy enumerator is evaluated by Enumerable#first" do
+    it "stops after specified times" do
+      (0..Float::INFINITY).lazy.send(@method, &:even?).first(3).should == [0, 2, 4]
+
+      @eventsmixed.send(@method) { true }.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.send(@method) { |v| yields << v }.force
+    yields.should == EnumeratorLazySpecs::YieldsMixed.gathered_yields
+  end
+
+  it "raises an ArgumentError when not given a block" do
+    lambda { @yieldsmixed.send(@method) }.should raise_error(ArgumentError)
+  end
+
+  describe "on a nested Lazy" do
+    it "sets #size to nil" do
+      Enumerator::Lazy.new(Object.new, 100) {}.take(50) {}.send(@method) { true }.size.should == nil
+    end
+
+    describe "when the returned lazy enumerator is evaluated by Enumerable#first" do
+      it "stops after specified times" do
+        (0..Float::INFINITY).lazy.send(@method) { |n| n > 5 }.send(@method, &:even?).first(3).should == [6, 8, 10]
+
+        @eventsmixed.send(@method) { true }.send(@method) { true }.first(1)
+        ScratchPad.recorded.should == [:before_yield]
+      end
+    end
+  end
+end
diff --git a/spec/ruby/core/enumerator/lazy/shared/to_enum.rb b/spec/ruby/core/enumerator/lazy/shared/to_enum.rb
new file mode 100644
index 0000000000..5e6935b45a
--- /dev/null
+++ b/spec/ruby/core/enumerator/lazy/shared/to_enum.rb
@@ -0,0 +1,50 @@
+# -*- encoding: us-ascii -*-
+
+require File.expand_path('../../../../../spec_helper', __FILE__)
+
+describe :enumerator_lazy_to_enum, shared: true do
+  before :each do
+    @infinite = (0..Float::INFINITY).lazy
+  end
+
+  it "requires multiple arguments" do
+    Enumerator::Lazy.instance_method(@method).arity.should < 0
+  end
+
+  it "returns a new instance of Enumerator::Lazy" do
+    ret = @infinite.send @method
+    ret.should be_an_instance_of(Enumerator::Lazy)
+    ret.should_not equal(@infinite)
+  end
+
+  it "sets #size to nil when not given a block" do
+    Enumerator::Lazy.new(Object.new, 100) {}.send(@method).size.should == nil
+  end
+
+  it "sets given block to size when given a block" do
+    Enumerator::Lazy.new(Object.new, 100) {}.send(@method) { 30 }.size.should == 30
+  end
+
+  it "generates a lazy enumerator from the given name" do
+    @infinite.send(@method, :with_index, 10).first(3).should == [[0, 10], [1, 11], [2, 12]]
+  end
+
+  it "passes given arguments to wrapped method" do
+    @infinite.send(@method, :each_slice, 2).map { |assoc| assoc.first * assoc.last }.first(4).should == [0, 6, 20, 42]
+  end
+
+  it "used by some parent's methods though returning Lazy" do
+    { each_with_index: [],
+      with_index: [],
+      cycle: [1],
+      each_with_object: [Object.new],
+      with_object: [Object.new],
+      each_slice: [2],
+      each_entry: [],
+      each_cons: [2]
+    }.each_pair do |method, args|
+      @infinite.method(method).owner.should_not equal(Enumerator::Lazy)
+      @infinite.send(method, *args).should be_an_instance_of(Enumerator::Lazy)
+    end
+  end
+end