From be65b400cff2c5d4a385eb253eeced7bbcc7bc84 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=20G=C3=B3mez?= <rgomezcasas@gmail.com>
Date: Wed, 20 Dec 2023 12:52:45 +0100
Subject: [PATCH] feat: add steps (#379)

* feat: add steps

* feat: add steps

* feat: delete steps

* feat: delete steps on cascade
---
 etc/databases/mooc.sql                        | 94 +++++++++++++------
 .../Create/CreateVideoStepCommandHandler.php  | 14 +++
 .../Application/Create/VideoStepCreator.php   | 14 +++
 .../Steps/Domain/Exercise/ExerciseStep.php    | 22 +++++
 .../Domain/Exercise/ExerciseStepContent.php   |  9 ++
 src/Mooc/Steps/Domain/Quiz/QuizStep.php       | 27 ++++++
 .../Steps/Domain/Quiz/QuizStepQuestion.php    | 22 +++++
 src/Mooc/Steps/Domain/Step.php                | 16 ++++
 src/Mooc/Steps/Domain/StepDuration.php        |  9 ++
 src/Mooc/Steps/Domain/StepId.php              |  9 ++
 src/Mooc/Steps/Domain/StepRepository.php      | 14 +++
 src/Mooc/Steps/Domain/StepTitle.php           |  9 ++
 src/Mooc/Steps/Domain/Video/VideoStep.php     | 22 +++++
 src/Mooc/Steps/Domain/Video/VideoStepUrl.php  |  9 ++
 .../Doctrine/Exercise.ExerciseStep.orm.xml    | 10 ++
 .../Exercise.ExerciseStepContent.orm.xml      | 10 ++
 .../Doctrine/Quiz.QuizStep.orm.xml            | 10 ++
 .../Doctrine/QuizStepQuestionsType.php        | 40 ++++++++
 .../Persistence/Doctrine/Step.orm.xml         | 20 ++++
 .../Persistence/Doctrine/StepDuration.orm.xml | 10 ++
 .../Persistence/Doctrine/StepIdType.php       | 16 ++++
 .../Persistence/Doctrine/StepTitle.orm.xml    | 10 ++
 .../Doctrine/Video.VideoStep.orm.xml          | 10 ++
 .../Doctrine/Video.VideoStepUrl.orm.xml       | 10 ++
 .../Persistence/MySqlStepRepository.php       | 28 ++++++
 .../Exercise/ExerciseStepContentMother.php    | 16 ++++
 .../Domain/Exercise/ExerciseStepMother.php    | 31 ++++++
 .../Mooc/Steps/Domain/Quiz/QuizStepMother.php | 36 +++++++
 .../Domain/Quiz/QuizStepQuestionMother.php    | 20 ++++
 .../Mooc/Steps/Domain/StepDurationMother.php  | 16 ++++
 tests/Mooc/Steps/Domain/StepIdMother.php      | 16 ++++
 tests/Mooc/Steps/Domain/StepTitleMother.php   | 16 ++++
 .../Steps/Domain/Video/VideoStepMother.php    | 31 ++++++
 .../Steps/Domain/Video/VideoStepUrlMother.php | 16 ++++
 .../Persistence/MySqlStepRepositoryTest.php   | 55 +++++++++++
 .../StepsModuleInfrastructureTestCase.php     | 16 ++++
 36 files changed, 703 insertions(+), 30 deletions(-)
 create mode 100644 src/Mooc/Steps/Application/Create/CreateVideoStepCommandHandler.php
 create mode 100644 src/Mooc/Steps/Application/Create/VideoStepCreator.php
 create mode 100644 src/Mooc/Steps/Domain/Exercise/ExerciseStep.php
 create mode 100644 src/Mooc/Steps/Domain/Exercise/ExerciseStepContent.php
 create mode 100644 src/Mooc/Steps/Domain/Quiz/QuizStep.php
 create mode 100644 src/Mooc/Steps/Domain/Quiz/QuizStepQuestion.php
 create mode 100644 src/Mooc/Steps/Domain/Step.php
 create mode 100644 src/Mooc/Steps/Domain/StepDuration.php
 create mode 100644 src/Mooc/Steps/Domain/StepId.php
 create mode 100644 src/Mooc/Steps/Domain/StepRepository.php
 create mode 100644 src/Mooc/Steps/Domain/StepTitle.php
 create mode 100644 src/Mooc/Steps/Domain/Video/VideoStep.php
 create mode 100644 src/Mooc/Steps/Domain/Video/VideoStepUrl.php
 create mode 100644 src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Exercise.ExerciseStep.orm.xml
 create mode 100644 src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Exercise.ExerciseStepContent.orm.xml
 create mode 100644 src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Quiz.QuizStep.orm.xml
 create mode 100644 src/Mooc/Steps/Infrastructure/Persistence/Doctrine/QuizStepQuestionsType.php
 create mode 100644 src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Step.orm.xml
 create mode 100644 src/Mooc/Steps/Infrastructure/Persistence/Doctrine/StepDuration.orm.xml
 create mode 100644 src/Mooc/Steps/Infrastructure/Persistence/Doctrine/StepIdType.php
 create mode 100644 src/Mooc/Steps/Infrastructure/Persistence/Doctrine/StepTitle.orm.xml
 create mode 100644 src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Video.VideoStep.orm.xml
 create mode 100644 src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Video.VideoStepUrl.orm.xml
 create mode 100644 src/Mooc/Steps/Infrastructure/Persistence/MySqlStepRepository.php
 create mode 100644 tests/Mooc/Steps/Domain/Exercise/ExerciseStepContentMother.php
 create mode 100644 tests/Mooc/Steps/Domain/Exercise/ExerciseStepMother.php
 create mode 100644 tests/Mooc/Steps/Domain/Quiz/QuizStepMother.php
 create mode 100644 tests/Mooc/Steps/Domain/Quiz/QuizStepQuestionMother.php
 create mode 100644 tests/Mooc/Steps/Domain/StepDurationMother.php
 create mode 100644 tests/Mooc/Steps/Domain/StepIdMother.php
 create mode 100644 tests/Mooc/Steps/Domain/StepTitleMother.php
 create mode 100644 tests/Mooc/Steps/Domain/Video/VideoStepMother.php
 create mode 100644 tests/Mooc/Steps/Domain/Video/VideoStepUrlMother.php
 create mode 100644 tests/Mooc/Steps/Infrastructure/Persistence/MySqlStepRepositoryTest.php
 create mode 100644 tests/Mooc/Steps/StepsModuleInfrastructureTestCase.php

diff --git a/etc/databases/mooc.sql b/etc/databases/mooc.sql
index a999ef78..1a094f82 100644
--- a/etc/databases/mooc.sql
+++ b/etc/databases/mooc.sql
@@ -4,35 +4,35 @@
 
 -- Generic tables
 
-CREATE TABLE `mutations` (
-	`id` BIGINT AUTO_INCREMENT PRIMARY KEY,
-	`table_name` VARCHAR(255) NOT NULL,
-	`operation` ENUM ('INSERT', 'UPDATE', 'DELETE') NOT NULL,
-	`old_value` JSON NULL,
-	`new_value` JSON NULL,
-	`mutation_timestamp` TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+CREATE TABLE mutations (
+	id BIGINT AUTO_INCREMENT PRIMARY KEY,
+	table_name VARCHAR(255) NOT NULL,
+	operation ENUM ('INSERT', 'UPDATE', 'DELETE') NOT NULL,
+	old_value JSON NULL,
+	new_value JSON NULL,
+	mutation_timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP
 ) ENGINE = InnoDB
   DEFAULT CHARSET = utf8mb4
   COLLATE = utf8mb4_unicode_ci;
 
-CREATE TABLE `domain_events` (
-	`id` CHAR(36) NOT NULL,
-	`aggregate_id` CHAR(36) NOT NULL,
-	`name` VARCHAR(255) NOT NULL,
-	`body` JSON NOT NULL,
-	`occurred_on` TIMESTAMP NOT NULL,
-	PRIMARY KEY (`id`)
+CREATE TABLE domain_events (
+	id CHAR(36) NOT NULL,
+	aggregate_id CHAR(36) NOT NULL,
+	name VARCHAR(255) NOT NULL,
+	body JSON NOT NULL,
+	occurred_on TIMESTAMP NOT NULL,
+	PRIMARY KEY (id)
 ) ENGINE = InnoDB
   DEFAULT CHARSET = utf8mb4
   COLLATE = utf8mb4_unicode_ci;
 
 -- Aggregates tables
 
-CREATE TABLE `courses` (
-	`id` CHAR(36) NOT NULL,
-	`name` VARCHAR(255) NOT NULL,
-	`duration` VARCHAR(255) NOT NULL,
-	PRIMARY KEY (`id`)
+CREATE TABLE courses (
+	id CHAR(36) NOT NULL,
+	name VARCHAR(255) NOT NULL,
+	duration VARCHAR(255) NOT NULL,
+	PRIMARY KEY (id)
 ) ENGINE = InnoDB
   DEFAULT CHARSET = utf8mb4
   COLLATE = utf8mb4_unicode_ci;
@@ -68,28 +68,62 @@ BEGIN
 	VALUES ('courses', 'DELETE', JSON_OBJECT('id', old.id, 'name', old.name, 'duration', old.duration), NOW());
 END;
 
-CREATE TABLE `courses_counter` (
-	`id` CHAR(36) NOT NULL,
-	`total` INT NOT NULL,
-	`existing_courses` JSON NOT NULL,
-	PRIMARY KEY (`id`)
+CREATE TABLE courses_counter (
+	id CHAR(36) NOT NULL,
+	total INT NOT NULL,
+	existing_courses JSON NOT NULL,
+	PRIMARY KEY (id)
 ) ENGINE = InnoDB
   DEFAULT CHARSET = utf8mb4
   COLLATE = utf8mb4_unicode_ci;
 
-INSERT INTO `courses_counter`
+INSERT INTO courses_counter (id, total, existing_courses)
 VALUES ("cdf26d7d-3deb-4e8c-9f73-4ac085a8d6f3", 0, "[]");
 
+CREATE TABLE steps (
+	id CHAR(36) NOT NULL,
+	title VARCHAR(255) NOT NULL,
+	duration INT NOT NULL,
+	type VARCHAR(255) NOT NULL,
+	PRIMARY KEY (id)
+) ENGINE = InnoDB
+  DEFAULT CHARSET = utf8mb4
+  COLLATE = utf8mb4_unicode_ci;
+
+CREATE TABLE steps_video (
+	id CHAR(36) NOT NULL,
+	url VARCHAR(255) NOT NULL,
+	FOREIGN KEY (id) REFERENCES steps(id) ON DELETE CASCADE
+) ENGINE = InnoDB
+  DEFAULT CHARSET = utf8mb4
+  COLLATE = utf8mb4_unicode_ci;
+
+CREATE TABLE steps_exercise (
+	id CHAR(36) NOT NULL,
+	content VARCHAR(255) NOT NULL,
+	FOREIGN KEY (id) REFERENCES steps(id) ON DELETE CASCADE
+) ENGINE = InnoDB
+  DEFAULT CHARSET = utf8mb4
+  COLLATE = utf8mb4_unicode_ci;
+
+CREATE TABLE steps_quiz (
+	id CHAR(36) NOT NULL,
+	questions TEXT NOT NULL,
+	FOREIGN KEY (id) REFERENCES steps(id) ON DELETE CASCADE
+) ENGINE = InnoDB
+  DEFAULT CHARSET = utf8mb4
+  COLLATE = utf8mb4_unicode_ci;
+
 
 /* -------------------------
       BACKOFFICE CONTEXT
 ---------------------------- */
 
-CREATE TABLE `backoffice_courses` (
-	`id` CHAR(36) NOT NULL,
-	`name` VARCHAR(255) NOT NULL,
-	`duration` VARCHAR(255) NOT NULL,
-	PRIMARY KEY (`id`)
+CREATE TABLE backoffice_courses (
+	id CHAR(36) NOT NULL,
+	name VARCHAR(255) NOT NULL,
+	duration VARCHAR(255) NOT NULL,
+	PRIMARY KEY (id)
 ) ENGINE = InnoDB
   DEFAULT CHARSET = utf8mb4
   COLLATE = utf8mb4_unicode_ci;
diff --git a/src/Mooc/Steps/Application/Create/CreateVideoStepCommandHandler.php b/src/Mooc/Steps/Application/Create/CreateVideoStepCommandHandler.php
new file mode 100644
index 00000000..34c30189
--- /dev/null
+++ b/src/Mooc/Steps/Application/Create/CreateVideoStepCommandHandler.php
@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Mooc\Steps\Application\Create;
+
+use CodelyTv\Shared\Domain\Bus\Command\CommandHandler;
+
+final readonly class CreateVideoStepCommandHandler implements CommandHandler
+{
+	public function __construct(private VideoStepCreator $creator) {}
+
+	public function __invoke(): void {}
+}
diff --git a/src/Mooc/Steps/Application/Create/VideoStepCreator.php b/src/Mooc/Steps/Application/Create/VideoStepCreator.php
new file mode 100644
index 00000000..00a95230
--- /dev/null
+++ b/src/Mooc/Steps/Application/Create/VideoStepCreator.php
@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Mooc\Steps\Application\Create;
+
+use CodelyTv\Mooc\Steps\Domain\StepRepository;
+
+final readonly class VideoStepCreator
+{
+	public function __construct(private StepRepository $repository) {}
+
+	public function __invoke(): void {}
+}
diff --git a/src/Mooc/Steps/Domain/Exercise/ExerciseStep.php b/src/Mooc/Steps/Domain/Exercise/ExerciseStep.php
new file mode 100644
index 00000000..21136ea1
--- /dev/null
+++ b/src/Mooc/Steps/Domain/Exercise/ExerciseStep.php
@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Mooc\Steps\Domain\Exercise;
+
+use CodelyTv\Mooc\Steps\Domain\Step;
+use CodelyTv\Mooc\Steps\Domain\StepDuration;
+use CodelyTv\Mooc\Steps\Domain\StepId;
+use CodelyTv\Mooc\Steps\Domain\StepTitle;
+
+final class ExerciseStep extends Step
+{
+	public function __construct(
+		StepId $id,
+		StepTitle $title,
+		StepDuration $duration,
+		private readonly ExerciseStepContent $content
+	) {
+		parent::__construct($id, $title, $duration);
+	}
+}
diff --git a/src/Mooc/Steps/Domain/Exercise/ExerciseStepContent.php b/src/Mooc/Steps/Domain/Exercise/ExerciseStepContent.php
new file mode 100644
index 00000000..4657206e
--- /dev/null
+++ b/src/Mooc/Steps/Domain/Exercise/ExerciseStepContent.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Mooc\Steps\Domain\Exercise;
+
+use CodelyTv\Shared\Domain\ValueObject\StringValueObject;
+
+final class ExerciseStepContent extends StringValueObject {}
diff --git a/src/Mooc/Steps/Domain/Quiz/QuizStep.php b/src/Mooc/Steps/Domain/Quiz/QuizStep.php
new file mode 100644
index 00000000..123caa71
--- /dev/null
+++ b/src/Mooc/Steps/Domain/Quiz/QuizStep.php
@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Mooc\Steps\Domain\Quiz;
+
+use CodelyTv\Mooc\Steps\Domain\Step;
+use CodelyTv\Mooc\Steps\Domain\StepDuration;
+use CodelyTv\Mooc\Steps\Domain\StepId;
+use CodelyTv\Mooc\Steps\Domain\StepTitle;
+
+final class QuizStep extends Step
+{
+	/** @var QuizStepQuestion[] */
+	private array $questions;
+
+	public function __construct(
+		StepId $id,
+		StepTitle $title,
+		StepDuration $duration,
+		QuizStepQuestion ...$questions
+	) {
+		parent::__construct($id, $title, $duration);
+
+		$this->questions = $questions;
+	}
+}
diff --git a/src/Mooc/Steps/Domain/Quiz/QuizStepQuestion.php b/src/Mooc/Steps/Domain/Quiz/QuizStepQuestion.php
new file mode 100644
index 00000000..15717259
--- /dev/null
+++ b/src/Mooc/Steps/Domain/Quiz/QuizStepQuestion.php
@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Mooc\Steps\Domain\Quiz;
+
+final readonly class QuizStepQuestion
+{
+	public function __construct(private string $question, private array $answers) {}
+
+	public static function fromString(string $value): self
+	{
+		[$question, $answers] = explode('----', $value);
+
+		return new self($question, explode('****', $answers));
+	}
+
+	public function toString(): string
+	{
+		return $this->question . '----' . implode('****', $this->answers);
+	}
+}
diff --git a/src/Mooc/Steps/Domain/Step.php b/src/Mooc/Steps/Domain/Step.php
new file mode 100644
index 00000000..b59277cd
--- /dev/null
+++ b/src/Mooc/Steps/Domain/Step.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Mooc\Steps\Domain;
+
+use CodelyTv\Shared\Domain\Aggregate\AggregateRoot;
+
+abstract class Step extends AggregateRoot
+{
+	public function __construct(
+		public readonly StepId $id,
+		private readonly StepTitle $title,
+		private readonly StepDuration $duration
+	) {}
+}
diff --git a/src/Mooc/Steps/Domain/StepDuration.php b/src/Mooc/Steps/Domain/StepDuration.php
new file mode 100644
index 00000000..e3091e19
--- /dev/null
+++ b/src/Mooc/Steps/Domain/StepDuration.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Mooc\Steps\Domain;
+
+use CodelyTv\Shared\Domain\ValueObject\IntValueObject;
+
+final class StepDuration extends IntValueObject {}
diff --git a/src/Mooc/Steps/Domain/StepId.php b/src/Mooc/Steps/Domain/StepId.php
new file mode 100644
index 00000000..34eb580e
--- /dev/null
+++ b/src/Mooc/Steps/Domain/StepId.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Mooc\Steps\Domain;
+
+use CodelyTv\Shared\Domain\ValueObject\Uuid;
+
+final class StepId extends Uuid {}
diff --git a/src/Mooc/Steps/Domain/StepRepository.php b/src/Mooc/Steps/Domain/StepRepository.php
new file mode 100644
index 00000000..031958b4
--- /dev/null
+++ b/src/Mooc/Steps/Domain/StepRepository.php
@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Mooc\Steps\Domain;
+
+interface StepRepository
+{
+	public function save(Step $step): void;
+
+	public function search(StepId $id): ?Step;
+
+	public function delete(Step $step): void;
+}
diff --git a/src/Mooc/Steps/Domain/StepTitle.php b/src/Mooc/Steps/Domain/StepTitle.php
new file mode 100644
index 00000000..deaf1b67
--- /dev/null
+++ b/src/Mooc/Steps/Domain/StepTitle.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Mooc\Steps\Domain;
+
+use CodelyTv\Shared\Domain\ValueObject\StringValueObject;
+
+final class StepTitle extends StringValueObject {}
diff --git a/src/Mooc/Steps/Domain/Video/VideoStep.php b/src/Mooc/Steps/Domain/Video/VideoStep.php
new file mode 100644
index 00000000..82c36c34
--- /dev/null
+++ b/src/Mooc/Steps/Domain/Video/VideoStep.php
@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Mooc\Steps\Domain\Video;
+
+use CodelyTv\Mooc\Steps\Domain\Step;
+use CodelyTv\Mooc\Steps\Domain\StepDuration;
+use CodelyTv\Mooc\Steps\Domain\StepId;
+use CodelyTv\Mooc\Steps\Domain\StepTitle;
+
+final class VideoStep extends Step
+{
+	public function __construct(
+		StepId $id,
+		StepTitle $title,
+		StepDuration $duration,
+		private readonly VideoStepUrl $url
+	) {
+		parent::__construct($id, $title, $duration);
+	}
+}
diff --git a/src/Mooc/Steps/Domain/Video/VideoStepUrl.php b/src/Mooc/Steps/Domain/Video/VideoStepUrl.php
new file mode 100644
index 00000000..17a4d81f
--- /dev/null
+++ b/src/Mooc/Steps/Domain/Video/VideoStepUrl.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Mooc\Steps\Domain\Video;
+
+use CodelyTv\Shared\Domain\ValueObject\StringValueObject;
+
+final class VideoStepUrl extends StringValueObject {}
diff --git a/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Exercise.ExerciseStep.orm.xml b/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Exercise.ExerciseStep.orm.xml
new file mode 100644
index 00000000..9cde5fd8
--- /dev/null
+++ b/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Exercise.ExerciseStep.orm.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doctrine-mapping xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                  xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping"
+                  xsi:schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping
+                          https://www.doctrine-project.org/schemas/orm/doctrine-mapping.xsd">
+
+    <entity name="CodelyTv\Mooc\Steps\Domain\Exercise\ExerciseStep" table="steps_exercise">
+        <embedded name="content" class="CodelyTv\Mooc\Steps\Domain\Exercise\ExerciseStepContent" use-column-prefix="false" />
+    </entity>
+</doctrine-mapping>
diff --git a/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Exercise.ExerciseStepContent.orm.xml b/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Exercise.ExerciseStepContent.orm.xml
new file mode 100644
index 00000000..09e493da
--- /dev/null
+++ b/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Exercise.ExerciseStepContent.orm.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doctrine-mapping xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                  xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping"
+                  xsi:schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping
+                          https://www.doctrine-project.org/schemas/orm/doctrine-mapping.xsd">
+
+    <embeddable name="CodelyTv\Mooc\Steps\Domain\Exercise\ExerciseStepContent">
+        <field name="value" type="string" column="content" />
+    </embeddable>
+</doctrine-mapping>
diff --git a/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Quiz.QuizStep.orm.xml b/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Quiz.QuizStep.orm.xml
new file mode 100644
index 00000000..4b116a56
--- /dev/null
+++ b/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Quiz.QuizStep.orm.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doctrine-mapping xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                  xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping"
+                  xsi:schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping
+                          https://www.doctrine-project.org/schemas/orm/doctrine-mapping.xsd">
+
+    <entity name="CodelyTv\Mooc\Steps\Domain\Quiz\QuizStep" table="steps_quiz">
+        <field name="questions" type="quiz_step_questions" column="questions" />
+    </entity>
+</doctrine-mapping>
diff --git a/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/QuizStepQuestionsType.php b/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/QuizStepQuestionsType.php
new file mode 100644
index 00000000..677fee74
--- /dev/null
+++ b/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/QuizStepQuestionsType.php
@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Mooc\Steps\Infrastructure\Persistence\Doctrine;
+
+use CodelyTv\Mooc\Steps\Domain\Quiz\QuizStepQuestion;
+use CodelyTv\Shared\Infrastructure\Doctrine\Dbal\DoctrineCustomType;
+use Doctrine\DBAL\Platforms\AbstractPlatform;
+use Doctrine\DBAL\Types\JsonType;
+
+use function Lambdish\Phunctional\map;
+
+final class QuizStepQuestionsType extends JsonType implements DoctrineCustomType
+{
+	public static function customTypeName(): string
+	{
+		return 'quiz_step_questions';
+	}
+
+	public function getName(): string
+	{
+		return self::customTypeName();
+	}
+
+	public function convertToDatabaseValue($value, AbstractPlatform $platform): ?string
+	{
+		return parent::convertToDatabaseValue(
+			map(fn (QuizStepQuestion $question): string => $question->toString(), $value),
+			$platform
+		);
+	}
+
+	public function convertToPHPValue($value, AbstractPlatform $platform): array
+	{
+		$scalars = parent::convertToPHPValue($value, $platform);
+
+		return map(fn (string $value): QuizStepQuestion => QuizStepQuestion::fromString($value), $scalars);
+	}
+}
diff --git a/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Step.orm.xml b/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Step.orm.xml
new file mode 100644
index 00000000..229add0c
--- /dev/null
+++ b/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Step.orm.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doctrine-mapping xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                  xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping"
+                  xsi:schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping
+                          https://www.doctrine-project.org/schemas/orm/doctrine-mapping.xsd">
+
+    <entity name="CodelyTv\Mooc\Steps\Domain\Step" table="steps" inheritance-type="JOINED">
+        <discriminator-column name="type" type="string" />
+        <discriminator-map>
+            <discriminator-mapping value="exercise" class="CodelyTv\Mooc\Steps\Domain\Exercise\ExerciseStep" />
+            <discriminator-mapping value="quiz" class="CodelyTv\Mooc\Steps\Domain\Quiz\QuizStep" />
+            <discriminator-mapping value="video" class="CodelyTv\Mooc\Steps\Domain\Video\VideoStep" />
+        </discriminator-map>
+
+        <id name="id" type="step_id" column="id" length="36" />
+
+        <embedded name="title" class="CodelyTv\Mooc\Steps\Domain\StepTitle" use-column-prefix="false" />
+        <embedded name="duration" class="CodelyTv\Mooc\Steps\Domain\StepDuration" use-column-prefix="false" />
+    </entity>
+</doctrine-mapping>
diff --git a/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/StepDuration.orm.xml b/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/StepDuration.orm.xml
new file mode 100644
index 00000000..c1307953
--- /dev/null
+++ b/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/StepDuration.orm.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doctrine-mapping xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                  xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping"
+                  xsi:schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping
+                          https://www.doctrine-project.org/schemas/orm/doctrine-mapping.xsd">
+
+    <embeddable name="CodelyTv\Mooc\Steps\Domain\StepDuration">
+        <field name="value" type="integer" column="duration" />
+    </embeddable>
+</doctrine-mapping>
diff --git a/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/StepIdType.php b/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/StepIdType.php
new file mode 100644
index 00000000..47b97966
--- /dev/null
+++ b/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/StepIdType.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Mooc\Steps\Infrastructure\Persistence\Doctrine;
+
+use CodelyTv\Mooc\Steps\Domain\StepId;
+use CodelyTv\Shared\Infrastructure\Persistence\Doctrine\UuidType;
+
+final class StepIdType extends UuidType
+{
+	protected function typeClassName(): string
+	{
+		return StepId::class;
+	}
+}
diff --git a/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/StepTitle.orm.xml b/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/StepTitle.orm.xml
new file mode 100644
index 00000000..a1019329
--- /dev/null
+++ b/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/StepTitle.orm.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doctrine-mapping xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                  xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping"
+                  xsi:schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping
+                          https://www.doctrine-project.org/schemas/orm/doctrine-mapping.xsd">
+
+    <embeddable name="CodelyTv\Mooc\Steps\Domain\StepTitle">
+        <field name="value" type="string" column="title" />
+    </embeddable>
+</doctrine-mapping>
diff --git a/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Video.VideoStep.orm.xml b/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Video.VideoStep.orm.xml
new file mode 100644
index 00000000..5302800f
--- /dev/null
+++ b/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Video.VideoStep.orm.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doctrine-mapping xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                  xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping"
+                  xsi:schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping
+                          https://www.doctrine-project.org/schemas/orm/doctrine-mapping.xsd">
+
+    <entity name="CodelyTv\Mooc\Steps\Domain\Video\VideoStep" table="steps_video">
+        <embedded name="url" class="CodelyTv\Mooc\Steps\Domain\Video\VideoStepUrl" use-column-prefix="false" />
+    </entity>
+</doctrine-mapping>
diff --git a/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Video.VideoStepUrl.orm.xml b/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Video.VideoStepUrl.orm.xml
new file mode 100644
index 00000000..a4141ba8
--- /dev/null
+++ b/src/Mooc/Steps/Infrastructure/Persistence/Doctrine/Video.VideoStepUrl.orm.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doctrine-mapping xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                  xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping"
+                  xsi:schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping
+                          https://www.doctrine-project.org/schemas/orm/doctrine-mapping.xsd">
+
+    <embeddable name="CodelyTv\Mooc\Steps\Domain\Video\VideoStepUrl">
+        <field name="value" type="string" column="url" />
+    </embeddable>
+</doctrine-mapping>
diff --git a/src/Mooc/Steps/Infrastructure/Persistence/MySqlStepRepository.php b/src/Mooc/Steps/Infrastructure/Persistence/MySqlStepRepository.php
new file mode 100644
index 00000000..45a1151d
--- /dev/null
+++ b/src/Mooc/Steps/Infrastructure/Persistence/MySqlStepRepository.php
@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Mooc\Steps\Infrastructure\Persistence;
+
+use CodelyTv\Mooc\Steps\Domain\Step;
+use CodelyTv\Mooc\Steps\Domain\StepId;
+use CodelyTv\Mooc\Steps\Domain\StepRepository;
+use CodelyTv\Shared\Infrastructure\Persistence\Doctrine\DoctrineRepository;
+
+final class MySqlStepRepository extends DoctrineRepository implements StepRepository
+{
+	public function save(Step $step): void
+	{
+		$this->persist($step);
+	}
+
+	public function search(StepId $id): ?Step
+	{
+		return $this->repository(Step::class)->find($id);
+	}
+
+	public function delete(Step $step): void
+	{
+		$this->remove($step);
+	}
+}
diff --git a/tests/Mooc/Steps/Domain/Exercise/ExerciseStepContentMother.php b/tests/Mooc/Steps/Domain/Exercise/ExerciseStepContentMother.php
new file mode 100644
index 00000000..eac56c22
--- /dev/null
+++ b/tests/Mooc/Steps/Domain/Exercise/ExerciseStepContentMother.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Tests\Mooc\Steps\Domain\Exercise;
+
+use CodelyTv\Mooc\Steps\Domain\Exercise\ExerciseStepContent;
+use CodelyTv\Tests\Shared\Domain\WordMother;
+
+final class ExerciseStepContentMother
+{
+	public static function create(?string $value = null): ExerciseStepContent
+	{
+		return new ExerciseStepContent($value ?? WordMother::create());
+	}
+}
diff --git a/tests/Mooc/Steps/Domain/Exercise/ExerciseStepMother.php b/tests/Mooc/Steps/Domain/Exercise/ExerciseStepMother.php
new file mode 100644
index 00000000..b62bc843
--- /dev/null
+++ b/tests/Mooc/Steps/Domain/Exercise/ExerciseStepMother.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Tests\Mooc\Steps\Domain\Exercise;
+
+use CodelyTv\Mooc\Steps\Domain\Exercise\ExerciseStep;
+use CodelyTv\Mooc\Steps\Domain\Exercise\ExerciseStepContent;
+use CodelyTv\Mooc\Steps\Domain\StepDuration;
+use CodelyTv\Mooc\Steps\Domain\StepId;
+use CodelyTv\Mooc\Steps\Domain\StepTitle;
+use CodelyTv\Tests\Mooc\Steps\Domain\StepDurationMother;
+use CodelyTv\Tests\Mooc\Steps\Domain\StepIdMother;
+use CodelyTv\Tests\Mooc\Steps\Domain\StepTitleMother;
+
+final class ExerciseStepMother
+{
+	public static function create(
+		?StepId $id = null,
+		?StepTitle $title = null,
+		?StepDuration $duration = null,
+		?ExerciseStepContent $content = null
+	): ExerciseStep {
+		return new ExerciseStep(
+			$id ?? StepIdMother::create(),
+			$title ?? StepTitleMother::create(),
+			$duration ?? StepDurationMother::create(),
+			$content ?? ExerciseStepContentMother::create()
+		);
+	}
+}
diff --git a/tests/Mooc/Steps/Domain/Quiz/QuizStepMother.php b/tests/Mooc/Steps/Domain/Quiz/QuizStepMother.php
new file mode 100644
index 00000000..70813730
--- /dev/null
+++ b/tests/Mooc/Steps/Domain/Quiz/QuizStepMother.php
@@ -0,0 +1,36 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Tests\Mooc\Steps\Domain\Quiz;
+
+use CodelyTv\Mooc\Steps\Domain\Quiz\QuizStep;
+use CodelyTv\Mooc\Steps\Domain\Quiz\QuizStepQuestion;
+use CodelyTv\Mooc\Steps\Domain\StepDuration;
+use CodelyTv\Mooc\Steps\Domain\StepId;
+use CodelyTv\Mooc\Steps\Domain\StepTitle;
+use CodelyTv\Tests\Mooc\Steps\Domain\StepDurationMother;
+use CodelyTv\Tests\Mooc\Steps\Domain\StepIdMother;
+use CodelyTv\Tests\Mooc\Steps\Domain\StepTitleMother;
+use CodelyTv\Tests\Shared\Domain\Repeater;
+
+final class QuizStepMother
+{
+	public static function create(
+		?StepId $id = null,
+		?StepTitle $title = null,
+		?StepDuration $duration = null,
+		QuizStepQuestion ...$questions
+	): QuizStep {
+		$stepQuestions = count($questions) === 0 ? Repeater::random(
+			fn (): QuizStepQuestion => QuizStepQuestionMother::create()
+		) : $questions;
+
+		return new QuizStep(
+			$id ?? StepIdMother::create(),
+			$title ?? StepTitleMother::create(),
+			$duration ?? StepDurationMother::create(),
+			...$stepQuestions
+		);
+	}
+}
diff --git a/tests/Mooc/Steps/Domain/Quiz/QuizStepQuestionMother.php b/tests/Mooc/Steps/Domain/Quiz/QuizStepQuestionMother.php
new file mode 100644
index 00000000..04fcd800
--- /dev/null
+++ b/tests/Mooc/Steps/Domain/Quiz/QuizStepQuestionMother.php
@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Tests\Mooc\Steps\Domain\Quiz;
+
+use CodelyTv\Mooc\Steps\Domain\Quiz\QuizStepQuestion;
+use CodelyTv\Tests\Shared\Domain\Repeater;
+use CodelyTv\Tests\Shared\Domain\WordMother;
+
+final class QuizStepQuestionMother
+{
+	public static function create(?string $question = null, array $answers = []): QuizStepQuestion
+	{
+		return new QuizStepQuestion(
+			$question ?? WordMother::create(),
+			count($answers) !== 0 ? $answers : Repeater::random(fn (): string => WordMother::create())
+		);
+	}
+}
diff --git a/tests/Mooc/Steps/Domain/StepDurationMother.php b/tests/Mooc/Steps/Domain/StepDurationMother.php
new file mode 100644
index 00000000..73ce6842
--- /dev/null
+++ b/tests/Mooc/Steps/Domain/StepDurationMother.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Tests\Mooc\Steps\Domain;
+
+use CodelyTv\Mooc\Steps\Domain\StepDuration;
+use CodelyTv\Tests\Shared\Domain\IntegerMother;
+
+final class StepDurationMother
+{
+	public static function create(?int $value = null): StepDuration
+	{
+		return new StepDuration($value ?? IntegerMother::between(1, 1000));
+	}
+}
diff --git a/tests/Mooc/Steps/Domain/StepIdMother.php b/tests/Mooc/Steps/Domain/StepIdMother.php
new file mode 100644
index 00000000..ec8575f3
--- /dev/null
+++ b/tests/Mooc/Steps/Domain/StepIdMother.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Tests\Mooc\Steps\Domain;
+
+use CodelyTv\Mooc\Steps\Domain\StepId;
+use CodelyTv\Tests\Shared\Domain\UuidMother;
+
+final class StepIdMother
+{
+	public static function create(?string $value = null): StepId
+	{
+		return new StepId($value ?? UuidMother::create());
+	}
+}
diff --git a/tests/Mooc/Steps/Domain/StepTitleMother.php b/tests/Mooc/Steps/Domain/StepTitleMother.php
new file mode 100644
index 00000000..9f6d53c8
--- /dev/null
+++ b/tests/Mooc/Steps/Domain/StepTitleMother.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Tests\Mooc\Steps\Domain;
+
+use CodelyTv\Mooc\Steps\Domain\StepTitle;
+use CodelyTv\Tests\Shared\Domain\WordMother;
+
+final class StepTitleMother
+{
+	public static function create(?string $value = null): StepTitle
+	{
+		return new StepTitle($value ?? WordMother::create());
+	}
+}
diff --git a/tests/Mooc/Steps/Domain/Video/VideoStepMother.php b/tests/Mooc/Steps/Domain/Video/VideoStepMother.php
new file mode 100644
index 00000000..2f252b33
--- /dev/null
+++ b/tests/Mooc/Steps/Domain/Video/VideoStepMother.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Tests\Mooc\Steps\Domain\Video;
+
+use CodelyTv\Mooc\Steps\Domain\StepDuration;
+use CodelyTv\Mooc\Steps\Domain\StepId;
+use CodelyTv\Mooc\Steps\Domain\StepTitle;
+use CodelyTv\Mooc\Steps\Domain\Video\VideoStep;
+use CodelyTv\Mooc\Steps\Domain\Video\VideoStepUrl;
+use CodelyTv\Tests\Mooc\Steps\Domain\StepDurationMother;
+use CodelyTv\Tests\Mooc\Steps\Domain\StepIdMother;
+use CodelyTv\Tests\Mooc\Steps\Domain\StepTitleMother;
+
+final class VideoStepMother
+{
+	public static function create(
+		?StepId $id = null,
+		?StepTitle $title = null,
+		?StepDuration $duration = null,
+		?VideoStepUrl $url = null
+	): VideoStep {
+		return new VideoStep(
+			$id ?? StepIdMother::create(),
+			$title ?? StepTitleMother::create(),
+			$duration ?? StepDurationMother::create(),
+			$url ?? VideoStepUrlMother::create()
+		);
+	}
+}
diff --git a/tests/Mooc/Steps/Domain/Video/VideoStepUrlMother.php b/tests/Mooc/Steps/Domain/Video/VideoStepUrlMother.php
new file mode 100644
index 00000000..65a58e71
--- /dev/null
+++ b/tests/Mooc/Steps/Domain/Video/VideoStepUrlMother.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Tests\Mooc\Steps\Domain\Video;
+
+use CodelyTv\Mooc\Steps\Domain\Video\VideoStepUrl;
+use CodelyTv\Tests\Shared\Domain\WordMother;
+
+final class VideoStepUrlMother
+{
+	public static function create(?string $value = null): VideoStepUrl
+	{
+		return new VideoStepUrl($value ?? WordMother::create());
+	}
+}
diff --git a/tests/Mooc/Steps/Infrastructure/Persistence/MySqlStepRepositoryTest.php b/tests/Mooc/Steps/Infrastructure/Persistence/MySqlStepRepositoryTest.php
new file mode 100644
index 00000000..f0a12d7d
--- /dev/null
+++ b/tests/Mooc/Steps/Infrastructure/Persistence/MySqlStepRepositoryTest.php
@@ -0,0 +1,55 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Tests\Mooc\Steps\Infrastructure\Persistence;
+
+use CodelyTv\Mooc\Steps\Domain\Step;
+use CodelyTv\Tests\Mooc\Steps\Domain\Exercise\ExerciseStepMother;
+use CodelyTv\Tests\Mooc\Steps\Domain\Quiz\QuizStepMother;
+use CodelyTv\Tests\Mooc\Steps\Domain\Video\VideoStepMother;
+use CodelyTv\Tests\Mooc\Steps\StepsModuleInfrastructureTestCase;
+
+final class MySqlStepRepositoryTest extends StepsModuleInfrastructureTestCase
+{
+	/**
+	 * @test
+	 * @dataProvider steps
+	 */
+	public function it_should_save_an_step(Step $step): void
+	{
+		$this->repository()->save($step);
+	}
+
+	/**
+	 * @test
+	 * @dataProvider steps
+	 */
+	public function it_should_search_an_existing_step(Step $step): void
+	{
+		$this->repository()->save($step);
+
+		$this->assertEquals($step, $this->repository()->search($step->id));
+	}
+
+	/**
+	 * @test
+	 * @dataProvider steps
+	 */
+	public function it_should_delete_an_existing_step(Step $step): void
+	{
+		$this->repository()->save($step);
+		$this->repository()->delete($step);
+
+		$this->assertNull($this->repository()->search($step->id));
+	}
+
+	public function steps(): array
+	{
+		return [
+			'video' => [VideoStepMother::create()],
+			'exercise' => [ExerciseStepMother::create()],
+			'quiz' => [QuizStepMother::create()],
+		];
+	}
+}
diff --git a/tests/Mooc/Steps/StepsModuleInfrastructureTestCase.php b/tests/Mooc/Steps/StepsModuleInfrastructureTestCase.php
new file mode 100644
index 00000000..8d0eb52c
--- /dev/null
+++ b/tests/Mooc/Steps/StepsModuleInfrastructureTestCase.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\Tests\Mooc\Steps;
+
+use CodelyTv\Mooc\Steps\Domain\StepRepository;
+use CodelyTv\Tests\Mooc\Shared\Infrastructure\PhpUnit\MoocContextInfrastructureTestCase;
+
+abstract class StepsModuleInfrastructureTestCase extends MoocContextInfrastructureTestCase
+{
+	protected function repository(): StepRepository
+	{
+		return $this->service(StepRepository::class);
+	}
+}