@covers annotations required

.php-cs-fixer.dist.php

@@ -13,6 +13,7 @@ return $config->setRules([
     'single_line_throw' => false,
     'unary_operator_spaces' => false,
     'visibility_required' => false,
+    'php_unit_test_class_requires_covers' => true,
 ])
     ->setFinder($finder)
 ;

test/JsonMachineTest/Exception/SyntaxErrorExceptionTest.php

@@ -5,6 +5,9 @@ namespace JsonMachineTest\Exception;
 use JsonMachine\Exception\SyntaxErrorException;
 use PHPUnit\Framework\TestCase;
 
+/**
+ * @covers \JsonMachine\Exception\SyntaxErrorException
+ */
 class SyntaxErrorExceptionTest extends TestCase
 {
     public function testMessageContainsDataFromConstructor()

test/JsonMachineTest/JsonDecoder/DecodingErrorTest.php

@@ -5,9 +5,11 @@ namespace JsonMachineTest\JsonDecoder;
 use JsonMachine\JsonDecoder\DecodingError;
 use PHPUnit\Framework\TestCase;
 
+/**
+ * @covers \JsonMachine\JsonDecoder\DecodingError
+ */
 class DecodingErrorTest extends TestCase
 {
-
     public function testGetMalformedJson()
     {
         $decodingError = new DecodingError('"json\"', null);

test/JsonMachineTest/JsonDecoder/InvalidResultTest.php

@@ -5,6 +5,9 @@ namespace JsonMachineTest\JsonDecoder;
 use JsonMachine\JsonDecoder\InvalidResult;
 use PHPUnit\Framework\TestCase;
 
+/**
+ * @covers \JsonMachine\JsonDecoder\InvalidResult
+ */
 class InvalidResultTest extends TestCase
 {
     public function testGetErrorMessage()

test/JsonMachineTest/JsonDecoder/ValidResultTest.php

@@ -5,9 +5,11 @@ namespace JsonMachineTest\JsonDecoder;
 use JsonMachine\JsonDecoder\ValidResult;
 use PHPUnit\Framework\TestCase;
 
+/**
+ * @covers \JsonMachine\JsonDecoder\ValidResult
+ */
 class ValidResultTest extends TestCase
 {
-
     public function testGetValue()
     {
         $result = new ValidResult('Value X');