Introduce endless range (a part of #5085)

Co-Authored-By: n4o847 <[email protected]>
Co-Authored-By: smallkirby <[email protected]>

1 files changed, 26 insertions, 3 deletions

diff --git a/mrbgems/mruby-range-ext/test/range.rb b/mrbgems/mruby-range-ext/test/range.rb
index 865e46d02..169ba7169 100644
--- a/mrbgems/mruby-range-ext/test/range.rb
+++ b/mrbgems/mruby-range-ext/test/range.rb
@@ -5,11 +5,16 @@ assert('Range#cover?') do
   assert_true ("a".."z").cover?("c")
   assert_true !("a".."z").cover?("5")
   assert_true ("a".."z").cover?("cc")
+  assert_true ("a"..).cover?("c")
+  assert_false ("a"..).cover?("5")
+  assert_true ("a"..).cover?("cc")
 end
 
 assert('Range#first') do
   assert_equal 10, (10..20).first
   assert_equal [10, 11, 12], (10..20).first(3)
+  assert_equal 10, (10..).first
+  assert_equal [10, 11, 12], (10..).first(3)
 
   skip unless Object.const_defined?(:Float)
   assert_equal [0, 1, 2], (0..Float::INFINITY).first(3)
@@ -18,6 +23,8 @@ end
 assert('Range#last') do
   assert_equal 20, (10..20).last
   assert_equal 20, (10...20).last
+  assert_raise(RangeError) { (10..).last }
+  assert_raise(RangeError) { (10...).last }
   assert_equal [18, 19, 20], (10..20).last(3)
   assert_equal [17, 18, 19], (10...20).last(3)
 end
@@ -26,6 +33,9 @@ assert('Range#size') do
   assert_equal 42, (1..42).size
   assert_equal 41, (1...42).size
   assert_nil ('a'..'z').size
+  assert_nil ('a'..).size
+  
+  assert_nil (1..).size unless Object.const_defined?(:Float)
 
   skip unless Object.const_defined?(:Float)
   assert_equal 6, (1...6.3).size
@@ -33,6 +43,10 @@ assert('Range#size') do
   assert_equal 5, (1.1...6).size
   assert_equal 15, (1.0..15.9).size
   assert_equal Float::INFINITY, (0..Float::INFINITY).size
+
+  assert_equal Float::INFINITY, (1..).size
+  assert_equal Float::INFINITY, (1...).size
+  assert_equal Float::INFINITY, (1.0..).size
 end
 
 assert('Range#max') do
@@ -50,6 +64,10 @@ assert('Range#max') do
   # returns the endpoint when the endpoint equals the start point and the range is inclusive
   assert_equal 5, (5..5).max
 
+  # raises RangeError when called on an endless range
+  assert_raise(RangeError) { (10..).max }
+  assert_raise(RangeError) { (10...).max }
+
   skip unless Object.const_defined?(:Float)
 
   # returns the maximum value in the Float range when called with no arguments
@@ -94,26 +112,31 @@ assert('Range#min') do
   # returns the minimum value in the range when called with no arguments
   assert_equal 1, (1..10).min
   assert_equal 1, (1...10).min
+  assert_equal 1, (1..).min
 
   # returns nil when the start point is greater than the endpoint
   assert_equal nil, (100..10).min
 
   # returns nil when the endpoint equals the start point and the range is exclusive
-  assert_equal nil, (5...5).max
+  assert_equal nil, (5...5).min
 
   # returns the endpoint when the endpoint equals the start point and the range is inclusive
-  assert_equal 5, (5..5).max
+  assert_equal 5, (5..5).min
 
   skip unless Object.const_defined?(:Float)
 
   # returns the minimum value in the Float range when called with no arguments
   assert_equal 303.20, (303.20..908.1111).min
+  assert_equal 1, (1.0..).min
 
   # returns nil when the start point is greater than the endpoint in a Float range
-  assert_equal nil, (3003.20..908.1111).max
+  assert_equal nil, (3003.20..908.1111).min
 end
 
 assert('Range#min given a block') do
+  # raise when called with a block in endless range
+  assert_raise(RangeError) { (1..).min{} }
+
   # passes each pair of values in the range to the block
   acc = []
   (1..10).min do |a, b|