Update tests

Author: Uditgulati

test/nmatrix_test.rb

@@ -55,8 +55,8 @@ def test_accessor_set
  end
 
  def test_slicing
- assert_equal @m[0, 0.., 0..], @s
- assert_equal @m[0, 0.., 0..], @s_int
+ assert_equal @m[0, 0..1, 0..1], @s
+ assert_equal @m[0, 0..1, 0..1], @s_int
  end
 
 end