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# Infection
Infection is a PHP mutation testing framework based on Abstract Syntax Tree.
***Composer***
```
composer require --dev infection/infection
```
***Config***
It lives under the `infection` namespace and has following configurable parameters:
```yaml
# grumphp.yml
grumphp:
tasks:
infection:
threads: ~
test_framework: ~
only_covered: false
show_mutations: false
verbose: false
configuration: ~
min_msi: ~
min_covered_msi: ~
mutators: []
ignore_patterns: []
triggered_by: [php]
```
**threads**
*Default: null*
If you want to run tests for mutated code in parallel, set this to something bigger than 1.
It will dramatically speed up the mutation process.
Please note that if your tests somehow depends on each other or use a database, this option can lead
to failing tests which give many false-positives results.
**test_framework**
*Default: null*
This is the name of a test framework to use. Currently, Infection supports `PhpUnit` and `PhpSpec`.
**only_covered**
*Default: false*
Run the mutation testing only for covered by tests files.
**show_mutations**
*Default: false*
Show escaped (and non-covered in verbose mode) mutations to the console.
**verbose**
*Default: false*
In verbose mode, non-covered escaped mutations will be shown in the console as well.
**configuration**
*Default: null*
The path or name to the infection configuration file.
**min_msi**
*Default: null*
This is a minimum threshold of Mutation Score Indicator (MSI) in percentage.
**min_covered_msi**
*Default: null*
This is a minimum threshold of Covered Code Mutation Score Indicator (MSI) in percentage.
**mutators**
*Default: []*
This is a list separated options to specify a particular set of mutators that needs to be executed.
**ignore_patterns**
*Default: []*
This is a list of patterns that will be ignored by Infection.
With this option you can skip files like tests. Leave this option blank to run analysis for all
'triggered by' files.
**triggered_by**
*Default: [php]*
This option will specify which file extensions will trigger the infection task.
By default, infection will be triggered by altering a php file.
You can overwrite this option to whatever file you want to use!