added tests for null comparison operators

Author: transistive

tests/Unit/IsNotNullTest.php

@@ -0,0 +1,45 @@
+<?php
+
+/*
+ * Cypher DSL
+ * Copyright (C) 2021  Wikibase Solutions
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+namespace WikibaseSolutions\CypherDSL\Tests\Unit;
+
+use PHPUnit\Framework\TestCase;
+use WikibaseSolutions\CypherDSL\IsNotNull;
+use WikibaseSolutions\CypherDSL\Types\PropertyTypes\BooleanType;
+
+/**
+ * @covers \WikibaseSolutions\CypherDSL\Not
+ */
+class IsNotNullTest extends TestCase
+{
+    use TestHelper;
+
+    public function testToQuery(): void
+    {
+        $not = new IsNotNull($this->getQueryConvertableMock(BooleanType::class, "true"));
+
+        $this->assertSame("(true IS NOT NULL)", $not->toQuery());
+
+        $not = new IsNotNull($not);
+
+        $this->assertSame("((true IS NOT NULL) IS NOT NULL)", $not->toQuery());
+    }
+}

tests/Unit/IsNullTest.php

@@ -0,0 +1,45 @@
+<?php
+
+/*
+ * Cypher DSL
+ * Copyright (C) 2021  Wikibase Solutions
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+namespace WikibaseSolutions\CypherDSL\Tests\Unit;
+
+use PHPUnit\Framework\TestCase;
+use WikibaseSolutions\CypherDSL\IsNull;
+use WikibaseSolutions\CypherDSL\Types\PropertyTypes\BooleanType;
+
+/**
+ * @covers \WikibaseSolutions\CypherDSL\Not
+ */
+class IsNullTest extends TestCase
+{
+    use TestHelper;
+
+    public function testToQuery(): void
+    {
+        $not = new IsNull($this->getQueryConvertableMock(BooleanType::class, "true"));
+
+        $this->assertSame("(true IS NULL)", $not->toQuery());
+
+        $not = new IsNull($not);
+
+        $this->assertSame("((true IS NULL) IS NULL)", $not->toQuery());
+    }
+}