1 files changed, 42 insertions, 0 deletions
diff --git a/spec/ruby/core/enumerable/chunk_while_spec.rb b/spec/ruby/core/enumerable/chunk_while_spec.rb
new file mode 100644
index 0000000000..286f717442
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+++ b/spec/ruby/core/enumerable/chunk_while_spec.rb
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+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "Enumerable#chunk_while" do
+  before :each do
+    ary = [10, 9, 7, 6, 4, 3, 2, 1]
+    @enum = EnumerableSpecs::Numerous.new(*ary)
+    @result = @enum.chunk_while { |i, j| i - 1 == j }
+    @enum_length = ary.length
+  end
+
+  context "when given a block" do
+    it "returns an enumerator" do
+      @result.should.instance_of?(Enumerator)
+    end
+
+    it "splits chunks between adjacent elements i and j where the block returns false" 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.chunk_while do |i, j|
+        times_called += 1
+        i - 1 == j
+      end.to_a
+      times_called.should == (@enum_length - 1)
+    end
+  end
+
+  context "when not given a block" do
+    it "raises an ArgumentError" do
+      -> { @enum.chunk_while }.should.raise(ArgumentError)
+    end
+  end
+
+  context "on a single-element array" do
+    it "ignores the block and returns an enumerator that yields [element]" do
+      [1].chunk_while {|x| x.even?}.to_a.should == [[1]]
+    end
+  end
+end