1 files changed, 82 insertions, 0 deletions
diff --git a/spec/ruby/core/range/max_spec.rb b/spec/ruby/core/range/max_spec.rb
new file mode 100644
index 0000000000..66e40bce1a
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+++ b/spec/ruby/core/range/max_spec.rb
@@ -0,0 +1,82 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Range#max" do
+  it "returns the maximum value in the range when called with no arguments" do
+    (1..10).max.should == 10
+    (1...10).max.should == 9
+    (0...2**64).max.should == 18446744073709551615
+    ('f'..'l').max.should == 'l'
+    ('a'...'f').max.should == 'e'
+  end
+
+  it "returns the maximum value in the Float range when called with no arguments" do
+    (303.20..908.1111).max.should == 908.1111
+  end
+
+  it "raises TypeError when called on an exclusive range and a non Integer value" do
+    lambda { (303.20...908.1111).max }.should raise_error(TypeError)
+  end
+
+  it "returns nil when the endpoint is less than the start point" do
+    (100..10).max.should be_nil
+    ('z'..'l').max.should be_nil
+  end
+
+  it "returns nil when the endpoint equals the start point and the range is exclusive" do
+    (5...5).max.should be_nil
+  end
+
+  it "returns the endpoint when the endpoint equals the start point and the range is inclusive" do
+    (5..5).max.should equal(5)
+  end
+
+  it "returns nil when the endpoint is less than the start point in a Float range" do
+    (3003.20..908.1111).max.should be_nil
+  end
+
+  it "returns end point when the range is Time..Time(included end point)" do
+    time_start = Time.now
+    time_end = Time.now + 1.0
+    (time_start..time_end).max.should equal(time_end)
+  end
+
+  it "raises TypeError when called on a Time...Time(excluded end point)" do
+    time_start = Time.now
+    time_end = Time.now + 1.0
+    lambda { (time_start...time_end).max  }.should raise_error(TypeError)
+  end
+end
+
+describe "Range#max given a block" do
+  it "passes each pair of values in the range to the block" do
+    acc = []
+    (1..10).max {|a,b| acc << [a,b]; a }
+    acc.flatten!
+    (1..10).each do |value|
+      acc.include?(value).should be_true
+    end
+  end
+
+  it "passes each pair of elements to the block in reversed order" do
+    acc = []
+    (1..5).max {|a,b| acc << [a,b]; a }
+    acc.should == [[2,1],[3,2], [4,3], [5, 4]]
+  end
+
+  it "calls #> and #< on the return value of the block" do
+    obj = mock('obj')
+    obj.should_receive(:>).exactly(2).times
+    obj.should_receive(:<).exactly(2).times
+    (1..3).max {|a,b| obj }
+  end
+
+  it "returns the element the block determines to be the maximum" do
+    (1..3).max {|a,b| -3 }.should == 1
+  end
+
+  it "returns nil when the endpoint is less than the start point" do
+    (100..10).max {|x,y| x <=> y}.should be_nil
+    ('z'..'l').max {|x,y| x <=> y}.should be_nil
+    (5...5).max {|x,y| x <=> y}.should be_nil
+  end
+end