Specs for Range#{count, each, equal_value, first, inspect, max, min, size}

Author: Lillian Zhang

spec/ruby/core/range/count_spec.rb

@@ -0,0 +1,20 @@
+require_relative '../../spec_helper'
+
+describe "Range#count" do
+  ruby_version_is "2.6" do
+    it "returns Infinity for endless ranges without arguments or blocks" do
+      inf = Float::INFINITY
+      eval("('a'...)").count.should == inf
+      eval("(7..)").count.should == inf
+    end
+  end
+
+  ruby_version_is "2.7" do
+    it "returns Infinity for beginless ranges without arguments or blocks" do
+      inf = Float::INFINITY
+      eval("(...'a')").count.should == inf
+      eval("(...nil)").count.should == inf
+      eval("(..10.0)").count.should == inf
+    end
+  end
+end

spec/ruby/core/range/each_spec.rb

@@ -54,6 +54,12 @@
     end
   end
 
+  ruby_version_is "2.7" do
+    it "raises a TypeError beginless ranges" do
+      -> { eval("(..2)").each { |x| x } }.should raise_error(TypeError)
+    end
+  end
+
   it "raises a TypeError if the first element does not respond to #succ" do
     -> { (0.5..2.4).each { |i| i } }.should raise_error(TypeError)
 

spec/ruby/core/range/equal_value_spec.rb

@@ -13,4 +13,10 @@
       eval("(1.0..)").should == eval("(1.0..)")
     end
   end
+
+  ruby_version_is "2.7" do
+    it "returns true if the endpoints are == for beginless ranges" do
+      eval("(...10)").should == eval("(...10)")
+    end
+  end
 end

spec/ruby/core/range/first_spec.rb

@@ -46,4 +46,10 @@
   it "raises a TypeError when passed a String" do
     -> { (2..3).first("1") }.should raise_error(TypeError)
   end
+
+  ruby_version_is "2.7" do
+    it "raises a RangeError when called on an beginless range" do
+      -> { eval("(..1)").first }.should raise_error(RangeError)
+    end
+  end
 end

spec/ruby/core/range/inspect_spec.rb

@@ -19,6 +19,18 @@
     end
   end
 
+  ruby_version_is '2.7' do
+    it "works for beginless ranges" do
+      eval("(..1)").inspect.should ==  "..1"
+      eval("(...0.1)").inspect.should ==  "...0.1"
+    end
+
+    it "works for nil ... nil ranges" do
+      eval("(..nil)").inspect.should ==  "nil..nil"
+      eval("(nil...)").inspect.should ==  "nil...nil"
+    end
+  end
+
   ruby_version_is ''...'2.7' do
     it "returns a tainted string if either end is tainted" do
       (("a".taint)..."c").inspect.tainted?.should be_true

spec/ruby/core/range/max_spec.rb

@@ -51,6 +51,14 @@
       -> { eval("(1..)").max }.should raise_error(RangeError)
     end
   end
+
+  ruby_version_is "2.7.2" do
+    it "returns the end point (or one less) for beginless ranges" do
+      eval("(...1)").max.should == 0
+      eval("(..1)").max.should == 1
+      eval("(..1.0)").max.should == 1.0
+    end
+  end
 end
 
 describe "Range#max given a block" do
@@ -85,4 +93,10 @@
     ('z'..'l').max {|x,y| x <=> y}.should be_nil
     (5...5).max {|x,y| x <=> y}.should be_nil
   end
+
+  ruby_version_is "2.7" do
+    it "raises RangeError when called with custom comparison method on an beginless range" do
+      -> { eval("(..1)").max {|a, b| a} }.should raise_error(RangeError)
+    end
+  end
 end

spec/ruby/core/range/min_spec.rb

@@ -38,6 +38,19 @@
     time_end = Time.now + 1.0
     (time_start...time_end).min.should equal(time_start)
   end
+
+  ruby_version_is "2.6" do
+    it "returns the start point for endless ranges" do
+      eval("(1..)").min.should == 1
+      eval("(1.0...)").min.should == 1.0
+    end
+  end
+
+  ruby_version_is "2.7" do
+    it "raises RangeError when called on an beginless range" do
+      -> { eval("(..1)").min }.should raise_error(RangeError)
+    end
+  end
 end
 
 describe "Range#min given a block" do
@@ -74,9 +87,8 @@
   end
 
   ruby_version_is "2.6" do
-    it "returns the start point for endless ranges" do
-      eval("(1..)").min.should == 1
-      eval("(1.0...)").min.should == 1.0
+    it "raises RangeError when called with custom comparison method on an endless range" do
+      -> { eval("(1..)").min {|a, b| a} }.should raise_error(RangeError)
     end
   end
 end

spec/ruby/core/range/size_spec.rb

@@ -25,10 +25,24 @@
   end
 
   ruby_version_is "2.6" do
-    it 'returns Float::INFINITY for endless ranges' do
+    it 'returns Float::INFINITY for endless ranges if the start is numeric' do
       eval("(1..)").size.should == Float::INFINITY
       eval("(0.5...)").size.should == Float::INFINITY
     end
+
+    it 'returns nil for endless ranges if the start is not numeric' do
+      eval("('z'..)").size.should == nil
+      eval("([]...)").size.should == nil
+    end
+  end
+
+  ruby_version_is "2.7" do
+    it 'returns Float::INFINITY for all beginless ranges' do
+      eval("(..1)").size.should == Float::INFINITY
+      eval("(...0.5)").size.should == Float::INFINITY
+      eval("(..nil)").size.should == Float::INFINITY
+      eval("(...'o')").size.should == Float::INFINITY
+    end
   end
 
   it "returns nil if first and last are not Numeric" do