1 files changed, 54 insertions, 0 deletions
diff --git a/spec/rubyspec/core/enumerable/slice_when_spec.rb b/spec/rubyspec/core/enumerable/slice_when_spec.rb
new file mode 100644
index 0000000000..593e623b1b
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+++ b/spec/rubyspec/core/enumerable/slice_when_spec.rb
@@ -0,0 +1,54 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "Enumerable#slice_when" do
+  before :each do
+    ary = [10, 9, 7, 6, 4, 3, 2, 1]
+    @enum = EnumerableSpecs::Numerous.new(*ary)
+    @result = @enum.slice_when { |i, j| i - 1 != j }
+    @enum_length = ary.length
+  end
+
+  context "when given a block" do
+    it "returns an enumerator" do
+      @result.should be_an_instance_of(Enumerator)
+    end
+
+    it "splits chunks between adjacent elements i and j where the block returns true" do
+      @result.to_a.should == [[10, 9], [7, 6], [4, 3, 2, 1]]
+    end
+
+    it "calls the block for length of the receiver enumerable minus one times" do
+      times_called = 0
+      @enum.slice_when do |i, j|
+        times_called += 1
+        i - 1 != j
+      end.to_a
+      times_called.should == (@enum_length - 1)
+    end
+
+    it "doesn't yield an empty array if the block matches the first or the last time" do
+      @enum.slice_when { true }.to_a.should == [[10], [9], [7], [6], [4], [3], [2], [1]]
+    end
+
+    it "doesn't yield an empty array on a small enumerable" do
+      EnumerableSpecs::Empty.new.slice_when { raise }.to_a.should == []
+      EnumerableSpecs::Numerous.new(42).slice_when { raise }.to_a.should == [[42]]
+    end
+  end
+
+  context "when not given a block" do
+    it "raises an ArgumentError" do
+      lambda { @enum.slice_when }.should raise_error(ArgumentError)
+    end
+  end
+
+  describe "when an iterator method yields more than one value" do
+    it "processes all yielded values" do
+      def foo
+        yield 1, 2
+      end
+      to_enum(:foo).slice_when { true }.to_a.should == [[[1, 2]]]
+    end
+  end
+end