Updated exception message and added a testcase to check the message.

classes/mutex/SpinlockMutex.php

@@ -80,8 +80,8 @@ protected function unlock()
         $elapsed = microtime(true) - $this->acquired;
         if ($elapsed >= $this->timeout) {
             $message = sprintf(
-                "The code executed for %.2f seconds. But the timeout is %d " .
-                "seconds. The last %.2f seconds were executed outside the lock.",
+                "The code executed for %.2F seconds. But the timeout is %d " .
+                "seconds. The last %.2F seconds were executed outside the lock.",
                 $elapsed,
                 $this->timeout,
                 $elapsed - $this->timeout

tests/mutex/SpinlockMutexTest.php

@@ -2,9 +2,10 @@
 
 namespace malkusch\lock\mutex;
 
+use malkusch\lock\exception\ExecutionOutsideLockException;
 use malkusch\lock\exception\LockAcquireException;
-use phpmock\phpunit\PHPMock;
 use phpmock\environment\SleepEnvironmentBuilder;
+use phpmock\phpunit\PHPMock;
 
 /**
  * Tests for SpinlockMutex.
@@ -68,14 +69,19 @@ public function testAcquireTimesOut()
      * Tests executing code which exceeds the timeout fails.
      *
      * @test
-     * @expectedException malkusch\lock\exception\ExecutionOutsideLockException
      */
     public function testExecuteTooLong()
     {
         $mutex = $this->getMockForAbstractClass(SpinlockMutex::class, ["test", 1]);
         $mutex->expects($this->any())->method("acquire")->willReturn(true);
         $mutex->expects($this->any())->method("release")->willReturn(true);
 
+        $this->expectException(ExecutionOutsideLockException::class);
+        $this->expectExceptionMessageRegExp(
+            '/The code executed for \d+\.\d+ seconds. But the timeout is 1 ' .
+            'seconds. The last \d+\.\d+ seconds were executed outside the lock./'
+        );
+
         $mutex->synchronized(function () {
             sleep(1);
         });