Add integration tests of invalid REST parameters.

tests/integration/README.md

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+The integration test framework is designed to be used to run tests against
+an installed and working XDMoD instance.
+
+Run the tests with ./runtests.sh

tests/integration/bootstrap.php

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+<?php
+
+$dir = __DIR__;
+
+// Autoloader for test classes.
+spl_autoload_register(
+    function ($className) use ($dir) {
+        // Replace the IntegrationTests namespace prefix with the path to the
+        // integration tests lib directory.
+        $classPath = preg_replace(
+            '/IntegrationTests\\\\?/',
+            "$dir/lib/",
+            $className
+        );
+        // Replace namespace separators with directory separators.
+        $classPath = str_replace('\\', '/', $classPath) . '.php';
+        if (is_readable($classPath)) {
+            return require_once $classPath;
+        }
+        // Replace the IntegrationTests namespace prefix with the path to
+        // the main integration tests lib directory.
+        $classPath = preg_replace(
+            '/IntegrationTests\\\\?/',
+            "$dir/../../../xdmod/tests/integration/lib/",
+            $className
+        );
+        // Replace namespace separators with directory separators.
+        $classPath = str_replace('\\', '/', $classPath) . '.php';
+        if (is_readable($classPath)) {
+            return require_once $classPath;
+        }
+        // Autoload the AppKernels module classes
+        $classPath = (
+            "$dir/../../classes/"
+            . str_replace('\\', '/', $className)
+            . '.php'
+        );
+        if (is_readable($classPath)) {
+            return require_once $classPath;
+        }
+        return false;
+    }
+);
+
+// Autoloader for XDMoD classes.
+require_once __DIR__ . '/../../../xdmod/configuration/linker.php';