diff --git a/README.md b/README.md
index 5be961f69..00cfe8de6 100644
--- a/README.md
+++ b/README.md
@@ -45,6 +45,7 @@ To make GrumPHP even more awesome, it will suggest installing some extra package
 - codegyre/robo : ~0.7
 - doctrine/orm: ~2.5
 - friendsofphp/php-cs-fixer : ~1|~2
+- infection/infection: ^0.5
 - maglnet/composer-require-checker : ~0.1
 - malukenho/kawaii-gherkin : ~0.1
 - phing/phing : ~2.0
@@ -111,6 +112,7 @@ parameters:
         git_commit_message: ~
         grunt: ~
         gulp: ~
+        infection: ~
         jsonlint: ~
         kahlan: ~
         make: ~
diff --git a/composer.json b/composer.json
index f3efe7918..2ea66e094 100644
--- a/composer.json
+++ b/composer.json
@@ -42,6 +42,7 @@
         "doctrine/orm": "Lets GrumPHP validate your Doctrine mapping files.",
         "etsy/phan": "Lets GrumPHP unleash a static analyzer on your code",
         "friendsofphp/php-cs-fixer": "Lets GrumPHP automatically fix your codestyle.",
+        "infection/infection": "Lets GrumPHP evaluate the quality your unit tests",
         "jakub-onderka/php-parallel-lint": "Lets GrumPHP quickly lint your entire code base.",
         "maglnet/composer-require-checker": "Lets GrumPHP analyze composer dependencies.",
         "malukenho/kawaii-gherkin": "Lets GrumPHP lint your Gherkin files.",
diff --git a/doc/tasks.md b/doc/tasks.md
index 13bcb769e..e7e8c5a60 100644
--- a/doc/tasks.md
+++ b/doc/tasks.md
@@ -25,6 +25,7 @@ parameters:
         git_commit_message: ~
         grunt: ~
         gulp: ~
+        infection: ~
         jsonlint: ~
         kahlan: ~
         make: ~
@@ -73,6 +74,7 @@ Every task has it's own default configuration. It is possible to overwrite the p
 - [Git commit message](tasks/git_commit_message.md)
 - [Grunt](tasks/grunt.md)
 - [Gulp](tasks/gulp.md)
+- [Infection](tasks/infection.md)
 - [JsonLint](tasks/jsonlint.md)
 - [Kahlan](tasks/kahlan.md)
 - [Make](tasks/make.md)
diff --git a/doc/tasks/infection.md b/doc/tasks/infection.md
new file mode 100644
index 000000000..697322e1e
--- /dev/null
+++ b/doc/tasks/infection.md
@@ -0,0 +1,96 @@
+# 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
+parameters:
+    tasks:
+        infection:
+            configuration: ~
+            threads: ~
+            test_framework: ~
+            only_covered: false
+            configuration: ~
+            min_msi: ~
+            min_covered_msi: ~
+            mutators: []
+            triggered_by: [php]
+```
+
+**configuration**
+
+*Default: null*
+
+By defaut the `infection.json.dist` wil be used.
+You can specify an alternate location for this file by changing this option.
+
+
+**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.
+
+
+**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. 
+
+
+**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!
diff --git a/resources/config/tasks.yml b/resources/config/tasks.yml
index 2de204d18..9d8d87d0c 100644
--- a/resources/config/tasks.yml
+++ b/resources/config/tasks.yml
@@ -156,6 +156,16 @@ services:
             - '@formatter.raw_process'
         tags:
             - {name: grumphp.task, config: gulp}
+
+    task.infection:
+        class: GrumPHP\Task\Infection
+        arguments:
+          - '@config'
+          - '@process_builder'
+          - '@formatter.raw_process'
+        tags:
+          - {name: grumphp.task, config: infection}
+
     task.jsonlint:
         class: GrumPHP\Task\JsonLint
         arguments:
diff --git a/spec/Collection/ProcessArgumentsCollectionSpec.php b/spec/Collection/ProcessArgumentsCollectionSpec.php
index 708372f42..36033dea4 100644
--- a/spec/Collection/ProcessArgumentsCollectionSpec.php
+++ b/spec/Collection/ProcessArgumentsCollectionSpec.php
@@ -111,4 +111,15 @@ function it_should_be_able_to_add_comma_separated_files()
 
         $this->getValues()->shouldBe(['file1.txt,file2.txt']);
     }
+
+    function it_should_be_able_to_add_an_argument_with_comma_separated_files()
+    {
+        $files = new FilesCollection([
+            new SplFileInfo('file1.txt'),
+            new SplFileInfo('file2.txt')
+        ]);
+        $this->addArgumentWithCommaSeparatedFiles('--argument=%s', $files);
+
+        $this->getValues()->shouldBe(['--argument=file1.txt,file2.txt']);
+    }
 }
diff --git a/spec/Task/InfectionSpec.php b/spec/Task/InfectionSpec.php
new file mode 100644
index 000000000..bd20e2844
--- /dev/null
+++ b/spec/Task/InfectionSpec.php
@@ -0,0 +1,111 @@
+<?php
+
+namespace spec\GrumPHP\Task;
+
+use GrumPHP\Collection\FilesCollection;
+use GrumPHP\Collection\ProcessArgumentsCollection;
+use GrumPHP\Configuration\GrumPHP;
+use GrumPHP\Formatter\ProcessFormatterInterface;
+use GrumPHP\Process\ProcessBuilder;
+use GrumPHP\Runner\TaskResult;
+use GrumPHP\Runner\TaskResultInterface;
+use GrumPHP\Task\Context\ContextInterface;
+use GrumPHP\Task\Context\GitPreCommitContext;
+use GrumPHP\Task\Context\RunContext;
+use GrumPHP\Task\Infection;
+use PhpSpec\ObjectBehavior;
+use Symfony\Component\Finder\SplFileInfo;
+use Symfony\Component\OptionsResolver\OptionsResolver;
+use Symfony\Component\Process\Process;
+
+class InfectionSpec extends ObjectBehavior
+{
+    function let(GrumPHP $grumPHP, ProcessBuilder $processBuilder, ProcessFormatterInterface $formatter)
+    {
+        $grumPHP->getTaskConfiguration('infection')->willReturn([]);
+        $this->beConstructedWith($grumPHP, $processBuilder, $formatter);
+    }
+
+    function it_is_initializable()
+    {
+        $this->shouldHaveType(Infection::class);
+    }
+
+    function it_should_have_a_name()
+    {
+        $this->getName()->shouldBe('infection');
+    }
+
+    function it_should_have_configurable_options()
+    {
+        $options = $this->getConfigurableOptions();
+        $options->shouldBeAnInstanceOf(OptionsResolver::class);
+        $options->getDefinedOptions()->shouldContain('threads');
+        $options->getDefinedOptions()->shouldContain('test_framework');
+        $options->getDefinedOptions()->shouldContain('only_covered');
+        $options->getDefinedOptions()->shouldContain('configuration');
+        $options->getDefinedOptions()->shouldContain('min_msi');
+        $options->getDefinedOptions()->shouldContain('min_covered_msi');
+        $options->getDefinedOptions()->shouldContain('mutators');
+        $options->getDefinedOptions()->shouldContain('triggered_by');
+    }
+
+    function it_should_run_in_git_pre_commit_context(GitPreCommitContext $context)
+    {
+        $this->canRunInContext($context)->shouldReturn(true);
+    }
+
+    function it_should_run_in_run_context(RunContext $context)
+    {
+        $this->canRunInContext($context)->shouldReturn(true);
+    }
+
+    function it_does_not_do_anything_if_there_are_no_files(ProcessBuilder $processBuilder, ContextInterface $context)
+    {
+        $processBuilder->buildProcess('infection')->shouldNotBeCalled();
+        $processBuilder->buildProcess()->shouldNotBeCalled();
+        $context->getFiles()->willReturn(new FilesCollection());
+
+        $result = $this->run($context);
+        $result->shouldBeAnInstanceOf(TaskResultInterface::class);
+        $result->getResultCode()->shouldBe(TaskResult::SKIPPED);
+    }
+
+    function it_runs_the_suite(ProcessBuilder $processBuilder, Process $process, ContextInterface $context)
+    {
+        $arguments = new ProcessArgumentsCollection();
+        $processBuilder->createArgumentsForCommand('infection')->willReturn($arguments);
+        $processBuilder->buildProcess($arguments)->willReturn($process);
+
+        $process->run()->shouldBeCalled();
+        $process->isSuccessful()->willReturn(true);
+        $process->getErrorOutput()->willReturn('');
+        $process->getOutput()->willReturn('');
+
+        $context->getFiles()->willReturn(new FilesCollection([
+            new SplFileInfo('test.php', '.', 'test.php')
+        ]));
+
+        $result = $this->run($context);
+        $result->shouldBeAnInstanceOf(TaskResultInterface::class);
+        $result->isPassed()->shouldBe(true);
+    }
+
+    function it_throws_exception_if_the_process_fails(ProcessBuilder $processBuilder, Process $process, ContextInterface $context)
+    {
+        $arguments = new ProcessArgumentsCollection();
+        $processBuilder->createArgumentsForCommand('infection')->willReturn($arguments);
+        $processBuilder->buildProcess($arguments)->willReturn($process);
+
+        $process->run()->shouldBeCalled();
+        $process->isSuccessful()->willReturn(false);
+
+        $context->getFiles()->willReturn(new FilesCollection([
+            new SplFileInfo('src/Collection/TaskResultCollection.php', 'src/Collection', 'TaskResultCollection.php'),
+        ]));
+
+        $result = $this->run($context);
+        $result->shouldBeAnInstanceOf(TaskResultInterface::class);
+        $result->isPassed()->shouldBe(false);
+    }
+}
diff --git a/src/Collection/ProcessArgumentsCollection.php b/src/Collection/ProcessArgumentsCollection.php
index 6519866f0..ffc664cb3 100644
--- a/src/Collection/ProcessArgumentsCollection.php
+++ b/src/Collection/ProcessArgumentsCollection.php
@@ -135,4 +135,19 @@ public function addCommaSeparatedFiles(FilesCollection $files)
 
         $this->add(implode(',', $paths));
     }
+
+    /**
+     * @param string $argument
+     * @param FilesCollection|\SplFileInfo[] $files
+     */
+    public function addArgumentWithCommaSeparatedFiles($argument, FilesCollection $files)
+    {
+        $paths = [];
+
+        foreach ($files as $file) {
+            $paths[] = $file->getPathname();
+        }
+
+        $this->add(sprintf($argument, implode(',', $paths)));
+    }
 }
diff --git a/src/Task/Infection.php b/src/Task/Infection.php
new file mode 100644
index 000000000..9c45cc88d
--- /dev/null
+++ b/src/Task/Infection.php
@@ -0,0 +1,97 @@
+<?php
+
+namespace GrumPHP\Task;
+
+use GrumPHP\Runner\TaskResult;
+use GrumPHP\Task\Context\ContextInterface;
+use GrumPHP\Task\Context\GitPreCommitContext;
+use GrumPHP\Task\Context\RunContext;
+use Symfony\Component\OptionsResolver\OptionsResolver;
+
+/**
+ * Infection task
+ */
+class Infection extends AbstractExternalTask
+{
+    /**
+     * @return string
+     */
+    public function getName()
+    {
+        return 'infection';
+    }
+
+    /**
+     * @return OptionsResolver
+     */
+    public function getConfigurableOptions()
+    {
+        $resolver = new OptionsResolver();
+
+        $resolver->setDefaults([
+            'threads' => null,
+            'test_framework' => null,
+            'only_covered' => false,
+            'configuration' => null,
+            'min_msi' => null,
+            'min_covered_msi' => null,
+            'mutators' => [],
+            'triggered_by' => ['php'],
+        ]);
+
+        $resolver->addAllowedTypes('threads', ['null', 'int']);
+        $resolver->addAllowedTypes('test_framework', ['null', 'string']);
+        $resolver->addAllowedTypes('only_covered', ['bool']);
+        $resolver->addAllowedTypes('configuration', ['null', 'string']);
+        $resolver->addAllowedTypes('min_msi', ['null', 'integer']);
+        $resolver->addAllowedTypes('min_covered_msi', ['null', 'integer']);
+        $resolver->addAllowedTypes('mutators', ['array']);
+        $resolver->addAllowedTypes('triggered_by', ['array']);
+
+        return $resolver;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function canRunInContext(ContextInterface $context)
+    {
+        return ($context instanceof GitPreCommitContext || $context instanceof RunContext);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function run(ContextInterface $context)
+    {
+        $config = $this->getConfiguration();
+        $files = $context->getFiles()->extensions($config['triggered_by']);
+
+        if (0 === count($files)) {
+            return TaskResult::createSkipped($this, $context);
+        }
+
+        $arguments = $this->processBuilder->createArgumentsForCommand('infection');
+        $arguments->add('--no-interaction');
+        $arguments->addOptionalArgument('--threads=%s', $config['threads']);
+        $arguments->addOptionalArgument('--test-framework=%s', $config['test_framework']);
+        $arguments->addOptionalArgument('--only-covered', $config['only_covered']);
+        $arguments->addOptionalArgument('--configuration=%s', $config['configuration']);
+        $arguments->addOptionalArgument('--min-msi=%s', $config['min_msi']);
+        $arguments->addOptionalArgument('--min-covered-msi=%s', $config['min_covered_msi']);
+        $arguments->addOptionalCommaSeparatedArgument('--mutators=%s', $config['mutators']);
+
+        if ($context instanceof GitPreCommitContext) {
+            $arguments->addArgumentWithCommaSeparatedFiles('--filter=%s', $files);
+        }
+
+        $process = $this->processBuilder->buildProcess($arguments);
+        $process->run();
+
+        if (!$process->isSuccessful()) {
+            return TaskResult::createFailed($this, $context, $this->formatter->format($process));
+        }
+
+        return TaskResult::createPassed($this, $context);
+    }
+}