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About testing Predis

ATTENTION: Do not ever ever run this test suite against instances of Redis running in production environments or containing data you are interested in! If you still want to test this library on a production server without hitting the database, please read ahead about how to disable integration tests.

Predis ships a comprehensive test suite that uses PHPUnit to cover every aspect of the library. The suite is organized into several unit groups with the PHPUnit @group annotation which makes it possible to run only selected groups of tests. The main groups are:

  • disconnected: generic tests verifying the correct behaviour of the library without requiring an active connection to Redis.
  • connected: integration tests that require an active connection to Redis
  • commands: tests for the implementation of Redis commands.
  • slow: tests that might slow down the execution of the test suite (either connected or disconnected).

A list of all the available groups in the suite can be obtained by running:

$ phpunit --list-groups

Groups of tests can be disabled or enabled via the XML configuration file or the standard command line test runner. Please note that due to a bug in PHPUnit, older versions ignore the --group option when the group is excluded in the XML configuration file. More details about this issue are available on PHPUnit's bug tracker.

Certain groups of tests requiring native extensions, such as ext-curl or ext-phpiredis, are disabled by default in the configuration file. To enable these groups of tests you should remove them from the exclusion list in phpunit.xml.

Combining groups for inclusion or exclusion with the command-line runner

$ phpunit --group disconnected --exclude-group commands,slow

Integration tests

The suite performs integration tests against a running instance of Redis (>= 2.4.0) to verify the correct behavior of the implementation of each command and certain abstractions implemented in the library that depend on them. These tests are identified by the connected group.

Integration tests for commands that are not supported by the running instance of Redis are marked as skipped automatically.

If you do not have a Redis instance up and running or available for testing, you can completely disable integration tests by excluding the connected group:

$ phpunit --exclude-group connected

Slow tests

Certain tests can slow down the execution of the suite. These tests can be disabled by excluding the slow group:

$ phpunit --exclude-group slow

Testing Redis commands

We also provide an helper script in the bin directory that can be used to automatically generate a file with the skeleton of a test case to test a Redis command by specifying the name of the class in the Predis\Command\Redis namespace (only classes in this namespace are considered valid). For example to generate a test case for SET (represented by the Predis\Command\Redis\SET class):

$ ./bin/create-command-test --class=SET --realm=string

Each command must have a realm specified by the --realm command line argument using a value that matches its group, as defined by the Redis documentation. Valid realms are:

  • string
  • list
  • set
  • sorted_set
  • hash
  • geo
  • stream
  • hyperloglog
  • keys
  • scripting
  • pubsub
  • transaction
  • cluster
  • server
  • connection

When unsure about which value to use for --realm for a specific command, you can just infer it by searching in commands.json for the group attribute of the corrisponding command as use its value.