Test for data provider declaring class

tests/TextUI/dataprovider-pair.phpt

@@ -0,0 +1,17 @@
+--TEST--
+phpunit ../_files/DataProviderPair
+--FILE--
+<?php
+$_SERVER['argv'][1] = '--no-configuration';
+$_SERVER['argv'][2] = __DIR__ . '/../_files/DataProviderPair';
+
+require __DIR__ . '/../bootstrap.php';
+PHPUnit_TextUI_Command::main();
+--EXPECTF--
+PHPUnit %s by Sebastian Bergmann and contributors.
+
+..                                                                  2 / 2 (100%)
+
+Time: %s, Memory: %s
+
+OK (2 tests, 2 assertions)

tests/_files/DataProviderPair/FirstTest.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Foo;
+
+use PHPUnit\Framework\TestCase;
+
+class FirstTest extends TestCase
+{
+    /**
+     * @dataProvider provide
+     */
+    public function testFirst($x)
+    {
+        $this->assertTrue(true);
+    }
+
+    public function provide()
+    {
+        SecondTest::DUMMY;
+
+        return [[true]];
+    }
+}

tests/_files/DataProviderPair/SecondTest.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Foo;
+
+use PHPUnit\Framework\TestCase;
+
+class SecondTest extends TestCase
+{
+    const DUMMY = 'dummy';
+
+    public function testSecond()
+    {
+        $this->assertTrue(true);
+    }
+}