lib/io/test_push_back_reader.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # This file is free software, which comes along with NIT. This software is
   4 # distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
   5 # without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
   6 # PARTICULAR PURPOSE. You can modify it is you want, provided this header
   7 # is kept unaltered, and a notification of the changes is added.
   8 # You are allowed to redistribute it and sell it, alone or is a part of
   9 # another product.
  10
  11 # Test suites for module `push_back_reader`
  12 module test_push_back_reader is test_suite
  13
  14 import test_suite
  15 import io::push_back_reader
  16
  17 class TestPushBackDecorator
  18         super TestSuite
  19
  20         private fun sample: PushBackDecorator do
  21                 return new PushBackDecorator(new StringIStream("""
  22 abcd
  23
  24 efg
  25 """))
  26         end
  27
  28         fun test_read_char do
  29                 var subject = sample
  30
  31                 assert 'a' == subject.read_char.ascii
  32         end
  33
  34         fun test_read_char_eof do
  35                 var subject = new PushBackDecorator(new StringIStream(""))
  36
  37                 assert -1 == subject.read_char
  38         end
  39
  40         fun test_unread_read_char do
  41                 var subject = sample
  42
  43                 subject.unread_char('z')
  44                 assert 'z' == subject.read_char.ascii
  45                 assert 'a' == subject.read_char.ascii
  46         end
  47
  48         fun test_read_partial do
  49                 var subject = sample
  50
  51                 assert "abcd" == subject.read(4)
  52         end
  53
  54         fun test_read_too_much do
  55                 var subject = sample
  56                 var exp = """
  57 abcd
  58
  59 efg
  60 """
  61                 assert exp == subject.read(100)
  62         end
  63
  64         fun test_unread_read do
  65                 var subject = sample
  66
  67                 subject.unread("a")
  68                 assert "aab" == subject.read(3)
  69         end
  70
  71         fun test_unread_read_mixed do
  72                 var subject = sample
  73
  74                 subject.unread("a")
  75                 assert "aab" == subject.read(3)
  76         end
  77
  78         fun test_read_all do
  79                 var subject = sample
  80                 var exp = """
  81 abcd
  82
  83 efg
  84 """
  85                 assert exp == subject.read_all
  86         end
  87
  88         fun test_unread_read_all do
  89                 var subject = sample
  90                 var exp = """
  91 fooabcd
  92
  93 efg
  94 """
  95                 subject.unread("foo")
  96                 assert exp == subject.read_all
  97         end
  98
  99         fun test_read_line do
 100                 var subject = sample
 101
 102                 assert "abcd" == subject.read_line
 103                 assert "" == subject.read_line
 104         end
 105
 106         fun test_unread_read_line do
 107                 var subject = sample
 108
 109                 subject.unread("a\nb")
 110                 assert "a" == subject.read_line
 111                 assert "babcd" == subject.read_line
 112         end
 113
 114         fun test_eof do
 115                 var subject = sample
 116
 117                 assert not subject.eof
 118                 subject.read_all
 119                 assert subject.eof
 120         end
 121
 122         fun test_eof_empty do
 123                 var subject = new PushBackDecorator(new StringIStream(""))
 124
 125                 assert subject.eof
 126         end
 127
 128         fun test_close do
 129                 var subject = sample
 130
 131                 subject.close
 132                 assert subject.eof
 133         end
 134
 135         fun test_unread_close do
 136                 var subject = sample
 137
 138                 subject.unread("foo")
 139                 subject.close
 140                 assert subject.eof
 141         end
 142
 143         fun test_unread_char_order do
 144                 var subject = sample
 145
 146                 subject.unread_char('z')
 147                 subject.unread_char('y')
 148                 assert "yzab" == subject.read(4)
 149         end
 150
 151         fun test_unread_order do
 152                 var subject = sample
 153
 154                 subject.unread("bar")
 155                 subject.unread("foo")
 156                 assert "foobarab" == subject.read(8)
 157         end
 158 end