Support string to array conversion

Author: paulinevos

generator/mql-specifications

@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MongoDB\Tests\Builder\Expression;
+
+use MongoDB\Builder\Expression;
+use MongoDB\Builder\Pipeline;
+use MongoDB\Builder\Stage;
+use MongoDB\Tests\Builder\PipelineTestCase;
+
+/**
+ * Test $toArray expression
+ */
+class ToArrayOperatorTest extends PipelineTestCase
+{
+    public function testConvertBinDataToArray(): void
+    {
+        $pipeline = new Pipeline(
+            Stage::project(
+                _id: 0,
+                original: Expression::binDataFieldPath('v'),
+                asArray: Expression::toArray(
+                    Expression::binDataFieldPath('v'),
+                ),
+            ),
+        );
+
+        $this->assertSamePipeline(Pipelines::ToArrayConvertBinDataToArray, $pipeline);
+    }
+
+    public function testConvertStringToArray(): void
+    {
+        $pipeline = new Pipeline(
+            Stage::project(
+                _id: 0,
+                numbers: Expression::toArray('[1, 2, 3]'),
+                documents: Expression::toArray('[{"a": 1}, {"b": 2}]'),
+            ),
+        );
+
+        $this->assertSamePipeline(Pipelines::ToArrayConvertStringToArray, $pipeline);
+    }
+}