1 files changed, 163 insertions, 0 deletions
diff --git a/spec/ruby/core/numeric/step_spec.rb b/spec/ruby/core/numeric/step_spec.rb
new file mode 100644
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+++ b/spec/ruby/core/numeric/step_spec.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+require File.expand_path('../shared/step', __FILE__)
+
+describe "Numeric#step" do
+
+  describe 'with positional args' do
+    it "raises an ArgumentError when step is 0" do
+      lambda { 1.step(5, 0) {} }.should raise_error(ArgumentError)
+    end
+
+    it "raises an ArgumentError when step is 0.0" do
+      lambda { 1.step(2, 0.0) {} }.should raise_error(ArgumentError)
+    end
+
+    before :all do
+      # This lambda definition limits to return the arguments it receives.
+      # It's needed to test numeric_step behaviour with positional arguments.
+      @step_args = ->(*args) { args }
+    end
+
+    it_behaves_like :numeric_step, :step
+
+    describe "when no block is given" do
+      it "returns an Enumerator when step is 0" do
+        1.step(5, 0).should be_an_instance_of(Enumerator)
+      end
+
+      it "returns an Enumerator when step is 0.0" do
+        1.step(2, 0.0).should be_an_instance_of(Enumerator)
+      end
+
+      describe "returned Enumerator" do
+        describe "size" do
+          it "raises an ArgumentError when step is 0" do
+            enum = 1.step(5, 0)
+            lambda { enum.size }.should raise_error(ArgumentError)
+          end
+
+          it "raises an ArgumentError when step is 0.0" do
+            enum = 1.step(2, 0.0)
+            lambda { enum.size }.should raise_error(ArgumentError)
+          end
+        end
+      end
+    end
+
+  end
+
+  describe 'with keyword arguments' do
+    it "doesn't raise an error when step is 0" do
+      lambda { 1.step(to: 5, by: 0) { break } }.should_not raise_error
+    end
+
+    it "doesn't raise an error when step is 0.0" do
+      lambda { 1.step(to: 2, by: 0.0) { break } }.should_not raise_error
+    end
+
+    it "should loop over self when step is 0 or 0.0" do
+      1.step(to: 2, by: 0.0).take(5).should eql [1.0, 1.0, 1.0, 1.0, 1.0]
+      1.step(to: 2, by: 0).take(5).should eql [1, 1, 1, 1, 1]
+      1.1.step(to: 2, by: 0).take(5).should eql [1.1, 1.1, 1.1, 1.1, 1.1]
+    end
+
+    describe "when no block is given" do
+      describe "returned Enumerator" do
+        describe "size" do
+          it "should return infinity_value when limit is nil" do
+            1.step(by: 42).size.should == infinity_value
+          end
+
+          it "should return infinity_value when step is 0" do
+            1.step(to: 5, by: 0).size.should == infinity_value
+          end
+
+          it "should return infinity_value when step is 0.0" do
+            1.step(to: 2, by: 0.0).size.should == infinity_value
+          end
+
+          it "should return infinity_value when ascending towards a limit of Float::INFINITY" do
+            1.step(to: Float::INFINITY, by: 42).size.should == infinity_value
+          end
+
+          it "should return infinity_value when decending towards a limit of -Float::INFINITY" do
+            1.step(to: -Float::INFINITY, by: -42).size.should == infinity_value
+          end
+
+          it "should return 1 when the both limit and step are Float::INFINITY" do
+            1.step(to: Float::INFINITY, by: Float::INFINITY).size.should == 1
+          end
+
+          it "should return 1 when the both limit and step are -Float::INFINITY" do
+            1.step(to: -Float::INFINITY, by: -Float::INFINITY).size.should == 1
+          end
+        end
+      end
+    end
+
+    before :all do
+      # This lambda transforms a positional step method args into
+      # keyword arguments.
+      # It's needed to test numeric_step behaviour with keyword arguments.
+      @step_args = ->(*args) do
+        kw_args = {to: args[0]}
+        kw_args[:by] = args[1] if args.size == 2
+        [kw_args]
+      end
+    end
+    it_behaves_like :numeric_step, :step
+  end
+
+  describe 'with mixed arguments' do
+    it "doesn't raise an error when step is 0" do
+      lambda { 1.step(5, by: 0) { break } }.should_not raise_error
+    end
+
+    it "doesn't raise an error when step is 0.0" do
+      lambda { 1.step(2, by: 0.0) { break } }.should_not raise_error
+    end
+
+    it "raises a ArgumentError when limit and to are defined" do
+      lambda { 1.step(5, 1, to: 5) { break } }.should raise_error(ArgumentError)
+    end
+
+    it "raises a ArgumentError when step and by are defined" do
+      lambda { 1.step(5, 1, by: 5) { break } }.should raise_error(ArgumentError)
+    end
+
+    it "should loop over self when step is 0 or 0.0" do
+      1.step(2, by: 0.0).take(5).should eql [1.0, 1.0, 1.0, 1.0, 1.0]
+      1.step(2, by: 0).take(5).should eql [1, 1, 1, 1, 1]
+      1.1.step(2, by: 0).take(5).should eql [1.1, 1.1, 1.1, 1.1, 1.1]
+    end
+
+    describe "when no block is given" do
+      describe "returned Enumerator" do
+        describe "size" do
+          it "should return infinity_value when step is 0" do
+            1.step(5, by: 0).size.should == infinity_value
+          end
+
+          it "should return infinity_value when step is 0.0" do
+            1.step(2, by: 0.0).size.should == infinity_value
+          end
+        end
+      end
+    end
+    before :all do
+      # This lambda definition transforms a positional step method args into
+      # a mix of positional and keyword arguments.
+      # It's needed to test numeric_step behaviour with positional mixed with
+      # keyword arguments.
+      @step_args = ->(*args) do
+        if args.size == 2
+          [args[0], {by: args[1]}]
+        else
+          args
+        end
+      end
+    end
+    it_behaves_like :numeric_step, :step
+  end
+end