I've recently installed laravel and have written some tests in /tests directory but when I use phpunit at cmd in the same folder that phpunit.xml exists, it says 'phpunit' is not recognized as an internal or external command,operable program or batch file.. I'm using windows 7. what should I do?
The solution for me:
php vendor/phpunit/phpunit/phpunit
This, of course, assumes you've set up a php environment variable in Windows
As Unnawut said, it doesn't work because vendor/phpunit/phpunit/phpunit is not a native Windows executable. You need a .bat or .cmd file that will basically call 'php phpunit'. There should be one in vendor/bin, but to make life easy, try this - create a file phpunit.bat (or .cmd) at the root of your site, containing this:
@ECHO OFF
SET BIN_TARGET=%~dp0/vendor/phpunit/phpunit/phpunit
php "%BIN_TARGET%" %*
Now you can call phpunit from the command line at the root of the site.
If you are a window user and you are having this issue, do this:
You need to tell Window where to find PHPUnit command, you can first of all verify that this file exists in your Laravel project under /vendor/bin

Finally you need to append the full path to /vendor/bin in your window PATH variable,
To do this: 1. Right-click on 'Computer' then click properties

Advanced system settings

Advanced click Environmental Variables

PATH then set PATH variable by appendingthe full path to your laravel-project/vendor/bin; Notice the ; at the end.
NB: Other variables might already exists in the PATH, so ensure you don't overwrite them by appending your own at the very end
Ok on all the dialog boxes 
alias phpunit="vendor/bin/phpunit"
                        I added this command in command line instead of just "phpunit"
vendor\bin\phpunit
That worked for me.
Install phpunit globally:
composer global require phpunit/phpunit
Afterwards you will be able to run phpunit ( even on Windows ):
phpunit
                        The phpunit executable is not in your project root folder, that's why it can't find it.
Now I assume that you already have phpunit in your composer.json file, something like this:
"require-dev": {
    "phpunit/phpunit": "3.7.*"
}
When installed by composer, the package will be installed to vendor/vendor_name/package_name. So to run it at your project root, type this command:
vendor/phpunit/phpunit/phpunit
                        Borrowing from @Chris' excellent answer:
Even better, you can make vendor/phpunit/phpunit/phpunit an environment variable, say "phpunit" and whenever you want to run the test in any laravel project you just call php %phpunit%.

This working for me
In double quotes this command in console windows
"vendor/bin/phpunit"
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