Improve typing in tests and src

Author: Ayesh

src/Stopwatch.php

@@ -5,11 +5,11 @@
 
 class Stopwatch {
 
-  private $accrued = 0;
+  private float $accrued = 0;
 
-  private $timestamp;
+  private float $timestamp;
 
-  private $running = false;
+  private bool $running = false;
 
   public function __construct() {
     $this->start();

src/Timer.php

@@ -35,7 +35,7 @@ class Timer {
    *
    * @var Stopwatch[]
    */
-  static private $timers = [];
+  static private array $timers = [];
 
   /**
    * Start or resume the timer.
@@ -136,7 +136,7 @@ private static function secondsToTimeString(float $time): string {
    *
    * @throws LogicException If the attempted timer has not started already.
    */
-  public static function stop($key = 'default'): void {
+  public static function stop(string $key = 'default'): void {
     if (!isset(self::$timers[$key])) {
       throw new LogicException('Stopping timer when the given key timer was not initialized.');
     }

tests/StopwatchTest.php

@@ -21,7 +21,7 @@ public function testTimerStoppedValueRetention(): void {
     $this->assertSame($time_1, $time_2);
   }
 
-  public function testTimerContiniuous(): void {
+  public function testTimerContinious(): void {
     $stopwatch = new Stopwatch();
     $time_1    = $stopwatch->read();
     $this->assertIsFloat($time_1);

tests/TimerTest2.php

@@ -11,21 +11,21 @@
  */
 class TimerTest2 extends TestCase {
 
-  public function testTimerDefaultRunning() {
+  public function testTimerDefaultRunning(): void {
     Timer::start();
     sleep(20);
     $this->assertSame('20000', Timer::read());
   }
 
-  public function testNamedTimerRunning() {
+  public function testNamedTimerRunning(): void {
     $name = __FUNCTION__;
     Timer::start($name);
     $time_1 = Timer::read($name);
     $time_2 = Timer::read($name);
     $this->assertSame($time_1, $time_2);
   }
 
-  public function testUnknownTimerThrowsException() {
+  public function testUnknownTimerThrowsException(): void {
     Timer::start(__FUNCTION__);
     Timer::reset(__FUNCTION__);
     $this->expectException(\LogicException::class);