如何使用 Test::Unit::TestCase Perl CPAN 模块？
我有以下文件：
#!/usr/bin/perl
use Test::Unit::TestCase;
$self->assert(1)
当我运行 test.pl 时，我得到以下信息：
Can't call method "assert" on an undefined value at ./parse.pl line 3.
我运行了 sudo perl -MCPAN -e 'install Test::Unit' 和模块似乎安装正确（特别是因为我在 use 语句上没有收到错误），但我不知道如何实际使用该模块。
I have the following file:
#!/usr/bin/perl
use Test::Unit::TestCase;
$self->assert(1)
and when I run test.pl I get the following:
Can't call method "assert" on an undefined value at ./parse.pl line 3.
I ran sudo perl -MCPAN -e 'install Test::Unit' and the module seemed to be installed correctly (especially since I get no error on the use statement), but I don't know how to actually use the module.
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您是否尝试从文档复制代码示例？ （请参阅命令行上的
perldoc Test::Unit::TestCase。）收到警告的第一个问题是
$self尚未初始化。第二个问题是您没有使用 strict，这会给您一个更清晰的警告。第三个问题是您没有从模块继承。文档中的代码示例将解决第一个问题和第三个问题，第二个问题应该成为一种习惯。Did you try copying the code sample from the documentation? (see
perldoc Test::Unit::TestCaseon the command line.)Your first problem that you are getting warnings about is that
$selfhas not been initialized. A second problem is that you are not using strict, which would have given you a clearer warning. A third problem is that you are not inheriting from the module. The code sample in the documentation will solve the first and third problems, and the second is something that should become a habit.