Add tests for caching packages based on version, reference/revision

Author: adduc

fixtures/composer.json

@@ -0,0 +1,6 @@
+{
+    "require": {
+        "example/example-version": "1.0.7",
+        "example/example-reference": "dev-master"
+    }
+}

fixtures/composer.lock

@@ -0,0 +1 @@
+<?php

fixtures/vendor/example/example-reference/test.php

@@ -0,0 +1,3 @@
+<?php
+
+

fixtures/vendor/example/example-version/test.php

@@ -53,19 +53,27 @@ public function testIndexingWithDirectFileAccess()
         $promise = new Promise;
         $input = new MockProtocolStream;
         $output = new MockProtocolStream;
-        $output->on('message', function (Message $msg) use ($promise) {
+        $cacheVersionCalled = false;
+        $cacheReferenceCalled = false;
+        $output->on('message', function (Message $msg) use ($promise, &$cacheVersionCalled, &$cacheReferenceCalled) {
             if ($msg->body->method === 'window/logMessage' && $promise->state === Promise::PENDING) {
                 if ($msg->body->params->type === MessageType::ERROR) {
                     $promise->reject(new Exception($msg->body->params->message));
                 } else if (preg_match('/All [0-9]+ PHP files parsed/', $msg->body->params->message)) {
                     $promise->fulfill();
+                } else if (preg_match('#(Storing|Restored) example/example-version:.* (in|from) cache#', $msg->body->params->message)) {
+                    $cacheVersionCalled = true;
+                } else if (preg_match('#(Storing|Restored) example/example-reference:.* (in|from) cache#', $msg->body->params->message)) {
+                    $cacheReferenceCalled = true;
                 }
             }
         });
         $server = new LanguageServer($input, $output);
         $capabilities = new ClientCapabilities;
         $server->initialize($capabilities, realpath(__DIR__ . '/../fixtures'), getmypid());
         $promise->wait();
+        $this->assertTrue($cacheVersionCalled);
+        $this->assertTrue($cacheReferenceCalled);
     }
 
     public function testIndexingWithFilesAndContentRequests()