qa: fix failures due to rebasing

- Convert mock system from prophecy to PHPUnit mocks.
- Add return values where possible.
- Explicitly cast before calling a function.

Signed-off-by: Matthew Weier O'Phinney <matthew@weierophinney.net>

src/SwooleEmitter.php

@@ -85,7 +85,7 @@ private function emitBody(ResponseInterface $response): void
         }
 
         if (! $body->isReadable()) {
-            $this->swooleResponse->end($body);
+            $this->swooleResponse->end((string) $body);
             return;
         }
 

test/SwooleEmitterTest.php

@@ -159,10 +159,10 @@ public function testEmitWithBigContentBody(): void
         $this->assertTrue($this->emitter->emit($response));
     }
 
-    public function testEmitCallbackStream()
+    public function testEmitCallbackStream(): void
     {
         $content  = 'content';
-        $callable = function () use ($content) {
+        $callable = function () use ($content): string {
             return $content;
         };
 
@@ -171,16 +171,19 @@ public function testEmitCallbackStream()
             ->withStatus(200)
             ->withAddedHeader('Content-Type', 'text/plain');
 
-        $this->assertTrue($this->emitter->emit($response));
-
         $this->swooleResponse
-            ->status(200)
-            ->shouldHaveBeenCalled();
+            ->expects($this->once())
+            ->method('status')
+            ->with(200);
         $this->swooleResponse
-            ->header('Content-Type', 'text/plain')
-            ->shouldHaveBeenCalled();
+            ->expects($this->once())
+            ->method('header')
+            ->with('Content-Type', 'text/plain');
         $this->swooleResponse
-            ->end($content)
-            ->shouldHaveBeenCalled();
+            ->expects($this->once())
+            ->method('end')
+            ->with($content);
+
+        $this->assertTrue($this->emitter->emit($response));
     }
 }