Add information about method return type changes

src/PHPSemVerChecker/Analyzer/ClassAnalyzer.php

@@ -67,7 +67,7 @@ public function analyze(Registry $registryBefore, Registry $registryAfter)
 			if ($classBefore != $classAfter) {
 				// Check for case change of class name.
 				// If we entered this section then the normalized names (lowercase) were equal.
-				if ($classBefore->name !== $classAfter->name) {
+				if ($classBefore->name->toString() !== $classAfter->name->toString()) {
 					$report->add(
 						$this->context,
 						new ClassCaseChanged(

src/PHPSemVerChecker/Analyzer/ClassMethodAnalyzer.php

@@ -18,6 +18,9 @@
 use PHPSemVerChecker\Operation\ClassMethodParameterTypingAdded;
 use PHPSemVerChecker\Operation\ClassMethodParameterTypingRemoved;
 use PHPSemVerChecker\Operation\ClassMethodRemoved;
+use PHPSemVerChecker\Operation\ClassMethodReturnTypeAdded;
+use PHPSemVerChecker\Operation\ClassMethodReturnTypeChanged;
+use PHPSemVerChecker\Operation\ClassMethodReturnTypeRemoved;
 use PHPSemVerChecker\Report\Report;
 
 class ClassMethodAnalyzer
@@ -109,6 +112,29 @@ public function analyze(Stmt $contextBefore, Stmt $contextAfter)
 					);
 				}
 
+				if ($methodBefore->returnType !== $methodAfter->returnType) {
+					$class = ClassMethodCaseChanged::class;
+					if ($methodBefore->returnType === null) {
+						$class = ClassMethodReturnTypeAdded::class;
+					} elseif ($methodAfter->returnType === null) {
+						$class = ClassMethodReturnTypeRemoved::class;
+					} elseif ($methodAfter->returnType->name !== $methodBefore->returnType->name) {
+						$class = ClassMethodReturnTypeChanged::class;
+					}
+					$report->add(
+						$this->context,
+						new $class(
+							$this->context,
+							$this->fileBefore,
+							$contextAfter,
+							$methodBefore,
+							$this->fileAfter,
+							$contextAfter,
+							$methodAfter
+						)
+					);
+				}
+
 				$signatureResult = Signature::analyze($methodBefore->getParams(), $methodAfter->getParams());
 
 				$changes = [

src/PHPSemVerChecker/Analyzer/InterfaceAnalyzer.php

@@ -67,7 +67,7 @@ public function analyze(Registry $registryBefore, Registry $registryAfter)
 			if ($interfaceBefore != $interfaceAfter) {
 				// Check if the name of the interface has changed case.
 				// If we entered this section then the normalized names (lowercase) were equal.
-				if ($interfaceBefore->name !== $interfaceAfter->name) {
+				if ($interfaceBefore->name->toString() !== $interfaceAfter->name->toString()) {
 					$report->add(
 						'interface',
 						new InterfaceCaseChanged(

src/PHPSemVerChecker/Analyzer/TraitAnalyzer.php

@@ -65,7 +65,7 @@ public function analyze(Registry $registryBefore, Registry $registryAfter)
 			if ($traitBefore != $traitAfter) {
 				// Check for name case change.
 				// If we entered this section then the normalized names (lowercase) were equal.
-				if ($traitBefore->name !== $traitAfter->name) {
+				if ($traitBefore->name->toString() !== $traitAfter->name->toString()) {
 					$report->add(
 						$this->context,
 						new TraitCaseChanged(

src/PHPSemVerChecker/Configuration/LevelMapping.php

@@ -135,6 +135,12 @@ class LevelMapping
 		'V158' => Level::PATCH,
 		'V159' => Level::PATCH,
 		'V160' => Level::PATCH,
+		'V161' => Level::PATCH,
+		'V162' => Level::PATCH,
+		'V163' => Level::PATCH,
+		'V164' => Level::PATCH,
+		'V165' => Level::PATCH,
+		'V166' => Level::PATCH,
 	];
 
 	/**

src/PHPSemVerChecker/Operation/ClassMethodReturnTypeAdded.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace PHPSemVerChecker\Operation;
+
+class ClassMethodReturnTypeAdded extends ClassMethodOperationDelta
+{
+	/**
+	 * @var array
+	 */
+	protected $code = [
+		'class'     => ['V161'],
+		'interface' => ['V162'],
+		'trait'     => ['V163'],
+	];
+	/**
+	 * @var string
+	 */
+	protected $reason = 'Method return type added.';
+}

src/PHPSemVerChecker/Operation/ClassMethodReturnTypeChanged.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace PHPSemVerChecker\Operation;
+
+class ClassMethodReturnTypeChanged extends ClassMethodOperationDelta
+{
+	/**
+	 * @var array
+	 */
+	protected $code = [
+		'class'     => ['V164'],
+		'interface' => ['V165'],
+		'trait'     => ['V166'],
+	];
+	/**
+	 * @var string
+	 */
+	protected $reason = 'Method return type changed.';
+}

src/PHPSemVerChecker/Operation/ClassMethodReturnTypeRemoved.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace PHPSemVerChecker\Operation;
+
+class ClassMethodReturnTypeRemoved extends ClassMethodOperationDelta
+{
+	/**
+	 * @var array
+	 */
+	protected $code = [
+		'class'     => ['V164'],
+		'interface' => ['V165'],
+		'trait'     => ['V166'],
+	];
+	/**
+	 * @var string
+	 */
+	protected $reason = 'Method return type removed.';
+}