MNT Add test for backtrace class checking method.

tests/php/Dev/BacktraceTest.php

@@ -2,8 +2,13 @@
 
 namespace SilverStripe\Dev\Tests;
 
+use ReflectionMethod;
+use SilverStripe\Core\BaseKernel;
+use SilverStripe\Core\CoreKernel;
+use SilverStripe\Core\Kernel;
 use SilverStripe\Dev\Backtrace;
 use SilverStripe\Dev\SapphireTest;
+use SilverStripe\ORM\DataObject;
 
 class BacktraceTest extends SapphireTest
 {
@@ -109,4 +114,56 @@ class BacktraceTest extends SapphireTest
         $this->assertEquals('<filtered>', $filtered[1]['args']['password']);
         $this->assertEquals('myval', $filtered[2]['args']['myarg']);
     }
+
+    public function matchesFilterableClassProvider(): array
+    {
+        return [
+            [
+                'anything',
+                '*',
+                true,
+                'Wildcard counts as a match',
+            ],
+            [
+                DataObject::class,
+                BaseKernel::class,
+                false,
+                'No match',
+            ],
+            [
+                DataObject::class,
+                DataObject::class,
+                true,
+                'Exact match',
+            ],
+            [
+                CoreKernel::class,
+                BaseKernel::class,
+                true,
+                'Subclass counts as a match',
+            ],
+            [
+                BaseKernel::class,
+                CoreKernel::class,
+                false,
+                'Superclass does not count as a match',
+            ],
+            [
+                CoreKernel::class,
+                Kernel::class,
+                true,
+                'Implements interface counts as a match',
+            ],
+        ];
+    }
+
+    /**
+     * @dataProvider matchesFilterableClassProvider
+     */
+    public function testMatchesFilterableClass(string $className, string $filterableClass, bool $expected, string $message): void
+    {
+        $reflectionMethod = new ReflectionMethod(Backtrace::class . '::matchesFilterableClass');
+        $reflectionMethod->setAccessible(true);
+        $this->assertSame($expected, $reflectionMethod->invoke(null, $className, $filterableClass), $message);
+    }
 }