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diff --git a/web/modules/contrib/drupalmoduleupgrader/tests/src/Unit/Plugin/DMU/Converter/Functions/VariableDelTest.php b/web/modules/contrib/drupalmoduleupgrader/tests/src/Unit/Plugin/DMU/Converter/Functions/VariableDelTest.php
new file mode 100644
index 000000000..248376ab1
--- /dev/null
+++ b/web/modules/contrib/drupalmoduleupgrader/tests/src/Unit/Plugin/DMU/Converter/Functions/VariableDelTest.php
@@ -0,0 +1,61 @@
+<?php
+
+namespace Drupal\Tests\drupalmoduleupgrader\Unit\Plugin\DMU\Converter\Functions;
+
+use Pharborist\Filter;
+use Pharborist\Parser;
+
+/**
+ * @group DMU.Converter.Functions
+ * @covers \Drupal\drupalmoduleupgrader\Plugin\DMU\Converter\Functions\VariableDel
+ */
+class VariableDelTest extends FunctionCallModifierTestBase {
+
+  public function testNonStringKey() {
+    $original = <<<'END'
+<?php
+variable_del($my_var);
+END;
+    $expected = <<<'END'
+<?php
+// @FIXME
+// The correct configuration object could not be determined. You'll need to
+// rewrite this call manually.
+variable_del($my_var);
+END;
+
+    $snippet = Parser::parseSource($original);
+    $function_call = $snippet->find(Filter::isFunctionCall('variable_del'))->get(0);
+    $rewritten = $this->plugin->rewrite($function_call, $this->target);
+    $this->assertNull($rewritten);
+    $this->assertSame($expected, $snippet->getText());
+  }
+
+  public function testForeignStringKey() {
+    $original = <<<'END'
+<?php
+variable_del('bar_wambooli');
+END;
+    $expected = <<<'END'
+<?php
+// @FIXME
+// This looks like another module's variable. You'll need to rewrite this call
+// to ensure that it uses the correct configuration object.
+variable_del('bar_wambooli');
+END;
+
+    $snippet = Parser::parseSource($original);
+    $function_call = $snippet->find(Filter::isFunctionCall('variable_del'))->get(0);
+    $rewritten = $this->plugin->rewrite($function_call, $this->target);
+    $this->assertNull($rewritten);
+    $this->assertSame($expected, $snippet->getText());
+  }
+
+  public function testStringKey() {
+    $function_call = Parser::parseExpression('variable_del("foo_wambooli")');
+    $rewritten = $this->plugin->rewrite($function_call, $this->target);
+    $this->assertInstanceOf('\Pharborist\Objects\ObjectMethodCallNode', $rewritten);
+    $this->assertEquals('\Drupal::config(\'foo.settings\')->clear("foo_wambooli")->save()', $rewritten->getText());
+  }
+
+}