1 files changed, 115 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
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+++ b/spec/ruby/core/range/max_spec.rb
@@ -0,0 +1,115 @@
+require_relative '../../spec_helper'
+
+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
+    -> { (303.20...908.1111).max }.should.raise(TypeError)
+  end
+
+  it "returns nil when the endpoint is less than the start point" do
+    (100..10).max.should == nil
+    ('z'..'l').max.should == nil
+  end
+
+  it "returns nil when the endpoint equals the start point and the range is exclusive" do
+    (5...5).max.should == 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 == 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
+    -> { (time_start...time_end).max  }.should.raise(TypeError)
+  end
+
+  it "raises RangeError when called on an endless range" do
+    -> { eval("(1..)").max }.should.raise(RangeError)
+  end
+
+  it "returns the end point for beginless ranges" do
+    (..1).max.should == 1
+    (..1.0).max.should == 1.0
+  end
+
+  ruby_version_is ""..."4.0" do
+    it "raises for an exclusive beginless Integer range" do
+      -> {
+        (...1).max
+      }.should.raise(TypeError, 'cannot exclude end value with non Integer begin value')
+    end
+  end
+
+  ruby_version_is "4.0" do
+    it "returns the end point for exclusive beginless Integer ranges" do
+      (...1).max.should == 0
+    end
+  end
+
+  it "raises for an exclusive beginless non Integer range" do
+    -> {
+      (...1.0).max
+    }.should.raise(TypeError, 'cannot exclude non Integer end value')
+  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 == 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 == nil
+    ('z'..'l').max {|x,y| x <=> y}.should == nil
+    (5...5).max {|x,y| x <=> y}.should == nil
+  end
+
+  it "raises RangeError when called with custom comparison method on an beginless range" do
+    -> { (..1).max {|a, b| a} }.should.raise(RangeError)
+  end
+end