diff --git a/.gitignore b/.gitignore
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-                "reference": "4d7a795d35b889bf80a0cc04e08d77cedfa917a9",
-                "shasum": ""
-            },
-            "require": {
-                "php": "^7.1"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "2.0-dev"
-                }
-            },
-            "autoload": {
-                "classmap": [
-                    "src/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de"
-                }
-            ],
-            "description": "Provides a list of PHP built-in functions that operate on resources",
-            "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
-            "time": "2018-10-04T04:07:39+00:00"
-        },
-        {
-            "name": "sebastian/version",
-            "version": "2.0.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/sebastianbergmann/version.git",
-                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/99732be0ddb3361e16ad77b68ba41efc8e979019",
-                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.6"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "2.0.x-dev"
-                }
-            },
-            "autoload": {
-                "classmap": [
-                    "src/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de",
-                    "role": "lead"
-                }
-            ],
-            "description": "Library that helps with managing the version number of Git-hosted PHP projects",
-            "homepage": "https://github.com/sebastianbergmann/version",
-            "time": "2016-10-03T07:35:21+00:00"
-        },
-        {
-            "name": "squizlabs/php_codesniffer",
-            "version": "3.4.2",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/squizlabs/PHP_CodeSniffer.git",
-                "reference": "b8a7362af1cc1aadb5bd36c3defc4dda2cf5f0a8"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/squizlabs/PHP_CodeSniffer/zipball/b8a7362af1cc1aadb5bd36c3defc4dda2cf5f0a8",
-                "reference": "b8a7362af1cc1aadb5bd36c3defc4dda2cf5f0a8",
-                "shasum": ""
-            },
-            "require": {
-                "ext-simplexml": "*",
-                "ext-tokenizer": "*",
-                "ext-xmlwriter": "*",
-                "php": ">=5.4.0"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "^4.0 || ^5.0 || ^6.0 || ^7.0"
-            },
-            "bin": [
-                "bin/phpcs",
-                "bin/phpcbf"
-            ],
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "3.x-dev"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Greg Sherwood",
-                    "role": "lead"
-                }
-            ],
-            "description": "PHP_CodeSniffer tokenizes PHP, JavaScript and CSS files and detects violations of a defined set of coding standards.",
-            "homepage": "https://github.com/squizlabs/PHP_CodeSniffer",
-            "keywords": [
-                "phpcs",
-                "standards"
-            ],
-            "time": "2019-04-10T23:49:02+00:00"
-        },
-        {
-            "name": "symfony/polyfill-ctype",
-            "version": "v1.11.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/symfony/polyfill-ctype.git",
-                "reference": "82ebae02209c21113908c229e9883c419720738a"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/82ebae02209c21113908c229e9883c419720738a",
-                "reference": "82ebae02209c21113908c229e9883c419720738a",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.3.3"
-            },
-            "suggest": {
-                "ext-ctype": "For best performance"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.11-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Symfony\\Polyfill\\Ctype\\": ""
-                },
-                "files": [
-                    "bootstrap.php"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
-                },
-                {
-                    "name": "Gert de Pagter",
-                    "email": "BackEndTea@gmail.com"
-                }
-            ],
-            "description": "Symfony polyfill for ctype functions",
-            "homepage": "https://symfony.com",
-            "keywords": [
-                "compatibility",
-                "ctype",
-                "polyfill",
-                "portable"
-            ],
-            "time": "2019-02-06T07:57:58+00:00"
-        },
-        {
-            "name": "theseer/tokenizer",
-            "version": "1.1.2",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/theseer/tokenizer.git",
-                "reference": "1c42705be2b6c1de5904f8afacef5895cab44bf8"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/1c42705be2b6c1de5904f8afacef5895cab44bf8",
-                "reference": "1c42705be2b6c1de5904f8afacef5895cab44bf8",
-                "shasum": ""
-            },
-            "require": {
-                "ext-dom": "*",
-                "ext-tokenizer": "*",
-                "ext-xmlwriter": "*",
-                "php": "^7.0"
-            },
-            "type": "library",
-            "autoload": {
-                "classmap": [
-                    "src/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Arne Blankerts",
-                    "email": "arne@blankerts.de",
-                    "role": "Developer"
-                }
-            ],
-            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
-            "time": "2019-04-04T09:56:43+00:00"
-        },
-        {
-            "name": "webmozart/assert",
-            "version": "1.4.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/webmozart/assert.git",
-                "reference": "83e253c8e0be5b0257b881e1827274667c5c17a9"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/83e253c8e0be5b0257b881e1827274667c5c17a9",
-                "reference": "83e253c8e0be5b0257b881e1827274667c5c17a9",
-                "shasum": ""
-            },
-            "require": {
-                "php": "^5.3.3 || ^7.0",
-                "symfony/polyfill-ctype": "^1.8"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "^4.6",
-                "sebastian/version": "^1.0.1"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.3-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Webmozart\\Assert\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Bernhard Schussek",
-                    "email": "bschussek@gmail.com"
-                }
-            ],
-            "description": "Assertions to validate method input/output with nice error messages.",
-            "keywords": [
-                "assert",
-                "check",
-                "validate"
-            ],
-            "time": "2018-12-25T11:19:39+00:00"
-        }
-    ],
-    "aliases": [],
-    "minimum-stability": "stable",
-    "stability-flags": {
-        "bugatino/phpcs-git-pre-commit": 20
-    },
-    "prefer-stable": false,
-    "prefer-lowest": false,
-    "platform": [],
-    "platform-dev": []
-}
diff --git a/phpunit.xml b/phpunit.xml
index 1961e38..b4d7c1e 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -5,7 +5,7 @@
 
     <testsuites>
         <testsuite name="all">
-            <directory suffix="Test.php" phpVersion="7.2" phpVersionOperator=">=">tests</directory>
+            <directory suffix="Test.php" phpVersion="7.2" phpVersionOperator=">=">test</directory>
         </testsuite>
     </testsuites>
 
@@ -15,4 +15,4 @@
         </whitelist>
     </filter>
 
-</phpunit>
\ No newline at end of file
+</phpunit>
diff --git a/src/StateMachine/Machine.php b/src/StateMachine/Machine.php
index 152e7a1..aa48a87 100644
--- a/src/StateMachine/Machine.php
+++ b/src/StateMachine/Machine.php
@@ -8,7 +8,7 @@
  * Implementation of a
  * [state machine](https://en.wikipedia.org/wiki/Finite-state_machine)
  */
-class Machine implements IStateMachine
+class Machine implements IStateMachine, \JsonSerializable
 {
     use Execution;
 
@@ -125,4 +125,26 @@ private function getNextStates($input)
 
         return $next_states;
     }
+
+    public function jsonSerialize()
+    {
+        return (object) ['currentStates' => $this->currentStates, 'halted' => $this->halted];
+    }
+
+    public static function hydrate(string $json, $machine)
+    {
+        $data = (array) json_decode($json);
+        $class = new \ReflectionClass(get_class($machine));
+        if (get_class($machine) != self::class) {
+            $class = $class->getParentClass();
+        }
+
+        foreach ($data as $property_name => $value) {
+            $property = $class->getProperty($property_name);
+            $property->setAccessible(true);
+            $property->setValue($machine, $value);
+        }
+
+        return $machine;
+    }
 }
diff --git a/src/StateMachine/MachineOfMachines.php b/src/StateMachine/MachineOfMachines.php
index a9b3d3c..698346b 100644
--- a/src/StateMachine/MachineOfMachines.php
+++ b/src/StateMachine/MachineOfMachines.php
@@ -33,53 +33,6 @@ public function processInput(string $input)
             $this->resetCurrentMachines();
             parent::processInput($input);
         }
-
-      /*$got_machine = false;
-        $machine_finished = false;
-
-        $machines = [];
-        $errors = [];
-
-        foreach ($this->currentStates as $key => $current_state) {
-            $machine = $this->getStateMachine($current_state);
-            if ($machine) {
-                $machines[] = $machine;
-                $got_machine = true;
-                try {
-                    $machine->processInput($input);
-                    $this->halted = $this->didWeHalt();
-                } catch (\Exception $e) {
-                    $errors[] = true;
-
-                    if ($machine->isCurrentlyAtAnEndState()) {
-                        $machine_finished = true;
-                    } else {
-                        if (count($this->currentStates) > 1) {
-                            unset($this->currentStates[$key]);
-                        }
-                    }
-                    $this->halted = $this->didWeHalt();
-                    $machine->reset();
-                }
-            }
-        }
-
-        if ($got_machine) {
-            if (count($machines) === count($errors)) {
-                if ($machine_finished) {
-                    $real_halted = $this->halted;
-                    parent::processInput($input);
-                    $this->halted = $real_halted;
-                } else {
-                    throw new \Exception("We had machines for state(s) " .
-                      implode(", ", $this->currentStates) . " but no machine finished");
-                }
-            }
-        } else {
-            $real_halted = $this->halted;
-            parent::processInput($input);
-            $this->halted = $real_halted;
-        }*/
     }
 
     private function machineHalted()
@@ -131,40 +84,6 @@ public function resetCurrentMachines()
         }
     }
 
-    /*public function isCurrentlyAtAnEndState(): bool
-    {
-        $is = parent::isCurrentlyAtAnEndState();
-        if ($is === false) {
-            return false;
-        } else {
-          // If we are at an end state, we need to check the state of the machine.
-            try {
-                $finished = false;
-                $machines = [];
-                foreach ($this->getCurrentStates() as $current_state) {
-                    $machine = $this->getStateMachine($current_state);
-                    if ($machine) {
-                        $machines[] = $machine;
-                    }
-                }
-
-                if (empty($machines)) {
-                    $finished = true;
-                } else {
-                    foreach ($machines as $machine) {
-                        if ($machine->isCurrentlyAtAnEndState()) {
-                            $finished = true;
-                        }
-                    }
-                }
-
-                return $finished;
-            } catch (\Exception $e) {
-                return true;
-            }
-        }
-    }*/
-
     public function getStateMachine($state): ?IStateMachine
     {
         if (isset($this->machines[$state])) {
@@ -203,4 +122,32 @@ protected function didWeHalt()
             return $halted;
         }
     }
+
+    public function jsonSerialize()
+    {
+        $smo = parent::jsonSerialize();
+        $smo->machines = $this->machines;
+        return $smo;
+    }
+
+    public static function hydrate(string $json, $machine)
+    {
+        $data = json_decode($json);
+        $machines = (array) $data->machines;
+        unset($data->machines);
+      /** @var  $machine MachineOfMachines */
+        $machine = Machine::hydrate(json_encode($data), $machine);
+
+        foreach ($machines as $state => $data) {
+            $inner_machine = $machine->getStateMachine($state);
+            if (get_class($inner_machine) == Machine::class) {
+                $inner_machine = Machine::hydrate(json_encode($data), $inner_machine);
+            } else {
+                $inner_machine = MachineOfMachines::hydrate(json_encode($data), $inner_machine);
+            }
+            $machine->addMachine($state, $inner_machine);
+        }
+
+        return $machine;
+    }
 }
diff --git a/tests/BuilderTest.php b/test/BuilderTest.php
similarity index 100%
rename from tests/BuilderTest.php
rename to test/BuilderTest.php
diff --git a/tests/MachineOfMachinesTest.php b/test/MachineOfMachinesTest.php
similarity index 93%
rename from tests/MachineOfMachinesTest.php
rename to test/MachineOfMachinesTest.php
index f0e175e..d5a89b3 100644
--- a/tests/MachineOfMachinesTest.php
+++ b/test/MachineOfMachinesTest.php
@@ -60,6 +60,19 @@ public function testSqlString()
         }
     }
 
+    public function testSerialization()
+    {
+        $machine = $this->getSqlMachine();
+        Feeder::feed('[SELECT * FROM abc][WHERE d', $machine);
+        $this->assertFalse($machine->isCurrentlyAtAnEndState());
+
+        $json = json_encode($machine);
+        $machine2 = MachineOfMachines::hydrate($json, $this->getSqlMachine());
+
+        Feeder::feed('ef = "hij"];', $machine2);
+        $this->assertTrue($machine2->isCurrentlyAtAnEndState());
+    }
+
     private function getSqlMachine()
     {
         $machine = new MachineOfMachines(['select_start']);
diff --git a/tests/NonDeterministicStateMachineTest.php b/test/NonDeterministicStateMachineTest.php
similarity index 100%
rename from tests/NonDeterministicStateMachineTest.php
rename to test/NonDeterministicStateMachineTest.php
diff --git a/tests/StateMachineTest.php b/test/StateMachineTest.php
similarity index 72%
rename from tests/StateMachineTest.php
rename to test/StateMachineTest.php
index 0ffd7f4..6769025 100644
--- a/tests/StateMachineTest.php
+++ b/test/StateMachineTest.php
@@ -47,6 +47,27 @@ public function testTurnstile()
         $sm->processInput("Push");
         $this->assertEquals("Locked", $sm->getCurrentStates()[0]);
     }
+
+    public function testSerialization()
+    {
+        $sm = $this->stateMachine;
+        $virgin = clone $sm;
+
+        $sm->processInput("Push");
+        $this->assertEquals("Locked", $sm->getCurrentStates()[0]);
+
+        $sm->processInput("Coin");
+        $this->assertEquals("Un-locked", $sm->getCurrentStates()[0]);
+
+        $json = json_encode($sm);
+        $sm2 = Machine::hydrate($json, $virgin);
+
+        $sm2->processInput("Coin");
+        $this->assertEquals("Un-locked", $sm2->getCurrentStates()[0]);
+
+        $sm2->processInput("Push");
+        $this->assertEquals("Locked", $sm2->getCurrentStates()[0]);
+    }
 }
 
 // @codingStandardsIgnoreStart