From cc8ddbe513adf9c360c203bf769fc9700289c5ae Mon Sep 17 00:00:00 2001
From: Sebastian Bergmann <sb@sebastian-bergmann.de>
Date: Sun, 24 Nov 2019 10:29:40 +0100
Subject: [PATCH] Closes #3955

---
 ChangeLog-8.5.md           |  1 +
 src/Framework/TestCase.php | 12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/ChangeLog-8.5.md b/ChangeLog-8.5.md
index ae482ad5d7b..00d5bafacb9 100644
--- a/ChangeLog-8.5.md
+++ b/ChangeLog-8.5.md
@@ -12,6 +12,7 @@ All notable changes of the PHPUnit 8.5 release series are documented in this fil
 ### Changed
 
 * Implemented [#3950](https://github.com/sebastianbergmann/phpunit/issues/3950): Deprecate optional parameters of `assertFileEquals()` etc.
+* Implemented [#3955](https://github.com/sebastianbergmann/phpunit/issues/3955): Deprecate support for doubling multiple interfaces
 
 [8.5.0]: https://github.com/sebastianbergmann/phpunit/compare/8.4...master
 
diff --git a/src/Framework/TestCase.php b/src/Framework/TestCase.php
index 9ecda527901..d1aaeb2814d 100644
--- a/src/Framework/TestCase.php
+++ b/src/Framework/TestCase.php
@@ -772,6 +772,10 @@ public function run(TestResult $result = null): TestResult
      */
     public function getMockBuilder($className): MockBuilder
     {
+        if (!\is_string($className)) {
+            $this->addWarning('Passing an array of interface names to getMockBuilder() for creating a test double that implements multiple interfaces is deprecated and will no longer be supported in PHPUnit 9.');
+        }
+
         $this->recordDoubledType($className);
 
         return new MockBuilder($this, $className);
@@ -1571,6 +1575,10 @@ protected function createStub(string $originalClassName): Stub
      */
     protected function createMock($originalClassName): MockObject
     {
+        if (!\is_string($originalClassName)) {
+            $this->addWarning('Passing an array of interface names to createMock() for creating a test double that implements multiple interfaces is deprecated and will no longer be supported in PHPUnit 9.');
+        }
+
         return $this->getMockBuilder($originalClassName)
                     ->disableOriginalConstructor()
                     ->disableOriginalClone()
@@ -1611,6 +1619,10 @@ protected function createConfiguredMock($originalClassName, array $configuration
      */
     protected function createPartialMock($originalClassName, array $methods): MockObject
     {
+        if (!\is_string($originalClassName)) {
+            $this->addWarning('Passing an array of interface names to createPartialMock() for creating a test double that implements multiple interfaces is deprecated and will no longer be supported in PHPUnit 9.');
+        }
+
         $class_names = \is_array($originalClassName) ? $originalClassName : [$originalClassName];
 
         foreach ($class_names as $class_name) {