diff --git a/.github/actions/run-tests/README.md b/.github/actions/run-tests/README.md
index 96a8a18a2..404c6f8a2 100644
--- a/.github/actions/run-tests/README.md
+++ b/.github/actions/run-tests/README.md
@@ -32,7 +32,7 @@ The folder will be populated later during the build. There will be a few 100MB n
 
 In order to run the tests, a docker image accoring to your settings needs to be generated. This is done by calling
 ```
-docker-compose built dut
+docker-compose build dut
 ```
 
 This process will take some time as a few dependencies need to be compiled into the image. Just wait for it to succeed.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ceaadbe7f..e41ea0196 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,6 +25,8 @@
   [#375](https://github.com/nextcloud/cookbook/pull/375/) @seyfeb
 - Service to handle schema.org JSON data in strings easier
   [#383](https://github.com/nextcloud/cookbook/pull/383/) @christianlupus
+- Unit tests for JSON object service
+  [#387](https://github.com/nextcloud/cookbook/pull/387) @TobiasMie
 
 ### Changed
 - Switch of project ownership to neextcloud organization in GitHub
diff --git a/lib/Service/JsonService.php b/lib/Service/JsonService.php
index 6da6cffad..8ec50a7b5 100644
--- a/lib/Service/JsonService.php
+++ b/lib/Service/JsonService.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace OCA\Cookbook;
+namespace OCA\Cookbook\Service;
 
 /**
  * A collection of useful functions to handle schema.org JSON data
diff --git a/tests/Unit/Service/JsonServiceTest.php b/tests/Unit/Service/JsonServiceTest.php
new file mode 100644
index 000000000..efd37a26f
--- /dev/null
+++ b/tests/Unit/Service/JsonServiceTest.php
@@ -0,0 +1,87 @@
+<?php
+
+namespace OCA\Cookbook;
+
+use PHPUnit\Framework\TestCase;
+use OCA\Cookbook\Service\JsonService;
+
+class JsonServiceTest extends TestCase{
+    
+    /**
+     * @var JsonService
+     */
+    private $service;
+
+	public function setUp(): void{
+		$this->service = new JsonService();
+	}
+
+	public function testIsSchemaObject(){
+		// Objects must be encoded as arrays in JSON
+		$testData = "notAnArray";
+		$result = $this->service->isSchemaObject($testData);
+		self::assertFalse($result, 'The object must be an array');
+
+		// Objects must have a property @type
+		$testData = [
+			"@context" => "https://schema.org/",
+			"name" => "Schema.org Ontology",
+			"subjectOf" => [
+				"@type" => "Book",
+				"name" => "The Complete History of Schema.org"
+			]
+		];
+		$result = $this->service->isSchemaObject($testData);
+		self::assertFalse($result, 'The object must have the property @type');
+
+		// No typecheck will be requested
+		$testData = [
+			"@context" => "https://schema.org/",
+			"@type" => "Thing",
+			"name" => "Schema.org Ontology",
+			"subjectOf" => [
+				"@type" => "Book",
+				"name" => "The Complete History of Schema.org"
+			]
+		];
+		$result = $this->service->isSchemaObject($testData);
+		self::assertTrue($result);
+		$result = $this->service->isSchemaObject($testData, '');
+		self::assertTrue($result);
+
+		// Check if type matches
+		$testData = [
+			"@context" => "https://schema.org/",
+			"@type" => "Thing",
+			"name" => "Schema.org Ontology",
+			"subjectOf" => [
+				"@type" => "Book",
+				"name" => "The Complete History of Schema.org"
+			]
+		];
+		$result = $this->service->isSchemaObject($testData, 'Thing');
+		self::assertTrue($result, 'The type match but it returned false');
+		$result = $this->service->isSchemaObject($testData, 'Foo');
+		self::assertFalse($result, 'The type does not match bat it returned true');
+	}
+
+	public function testHasProperty(){
+		// The method isSchemaObject() is tested in another test and assumed as working properly
+		$testData = [
+			"@context" => "https://schema.org/",
+			"@type" => "Thing",
+			"name" => "Schema.org Ontology",
+			"subjectOf" => [
+				"@type" => "Book",
+				"name" => "The Complete History of Schema.org"
+			]
+		];
+		$result = $this->service->hasProperty($testData, 'name');
+		self::assertTrue($result, 'Property name was not found.');
+		$result = $this->service->hasProperty($testData, 'Bar');
+		self::assertFalse($result, 'Property Bar was falsely found.');
+		
+		$result = $this->service->hasProperty(['foo' => 'bar'], 'foo');
+		self::assertFalse($result, 'Property of a non-object must not be returned.');
+	}
+}