Add AbstractTestContainer class

Author: tvdijen

composer.json

@@ -12,7 +12,8 @@
     ],
     "autoload": {
         "psr-4": {
-            "SimpleSAML\\TestUtils\\": "lib/"
+            "SimpleSAML\\TestUtils\\": "lib/",
+            "SimpleSAML\\TestUtils\\": "src/"
         }
     },
     "autoload-dev": {

src/AbstractTestContainer.php

@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SimpleSAML\TestUtils;
+
+/**
+ * Class \SimpleSAML\TestUtils\AbstractTestContainer
+ */
+abstract class AbstractTestContainer
+{
+}

src/TestContainerSingleton.php

@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SimpleSAML\TestUtils;
+
+use SimpleSAML\XML\Assert\Assert;
+
+/**
+ * Class \SimpleSAML\TestUtils\TestContainerSingleton
+ */
+final class TestContainerSingleton
+{
+    protected static AbstractTestContainer $testContainer;
+
+
+    /** Set a container to use. */
+    public static function setContainer(AbstractTestContainer $testContainer): void
+    {
+        self::$testContainer = $testContainer;
+    }
+
+
+    public static function getContainer(): AbstractTestContainer
+    {
+        Assert::notNull(self::$testContainer, 'No container set.');
+        return self::$testContainer;
+    }
+}