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diff --git a/spec/rubyspec/core/array/sort_by_spec.rb b/spec/rubyspec/core/array/sort_by_spec.rb
new file mode 100644
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+++ b/spec/rubyspec/core/array/sort_by_spec.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+require File.expand_path('../../enumerable/shared/enumeratorized', __FILE__)
+
+describe "Array#sort_by!" do
+  it "sorts array in place by passing each element to the given block" do
+    a = [-100, -2, 1, 200, 30000]
+    a.sort_by!{ |e| e.to_s.size }
+    a.should == [1, -2, 200, -100, 30000]
+  end
+
+  it "returns an Enumerator if not given a block" do
+    (1..10).to_a.sort_by!.should be_an_instance_of(Enumerator)
+  end
+
+  it "completes when supplied a block that always returns the same result" do
+    a = [2, 3, 5, 1, 4]
+    a.sort_by!{  1 }
+    a.should be_an_instance_of(Array)
+    a.sort_by!{  0 }
+    a.should be_an_instance_of(Array)
+    a.sort_by!{ -1 }
+    a.should be_an_instance_of(Array)
+  end
+
+  it "raises a RuntimeError on a frozen array" do
+    lambda { ArraySpecs.frozen_array.sort_by! {}}.should raise_error(RuntimeError)
+  end
+
+  it "raises a RuntimeError on an empty frozen array" do
+    lambda { ArraySpecs.empty_frozen_array.sort_by! {}}.should raise_error(RuntimeError)
+  end
+
+  it "returns the specified value when it would break in the given block" do
+    [1, 2, 3].sort_by!{ break :a }.should == :a
+  end
+
+  it "makes some modification even if finished sorting when it would break in the given block" do
+    partially_sorted = (1..5).map{|i|
+      ary = [5, 4, 3, 2, 1]
+      ary.sort_by!{|x,y| break if x==i; x<=>y}
+      ary
+    }
+    partially_sorted.any?{|ary| ary != [1, 2, 3, 4, 5]}.should be_true
+  end
+
+  it "changes nothing when called on a single element array" do
+    [1].sort_by!(&:to_s).should == [1]
+  end
+
+  it_behaves_like :enumeratorized_with_origin_size, :sort_by!, [1,2,3]
+end