Add tests

tests/phpunit/class-integration-tablepress-test.php

@@ -0,0 +1,48 @@
+<?php
+
+use SebastianBergmann\RecursionContext\InvalidArgumentException;
+use PHPUnit\Framework\ExpectationFailedException;
+
+/**
+ * Test the main plugin class.
+ */
+class Integration_TablePress_Test extends WP_UnitTestCase {
+
+	/**
+	 * Can merge form data with table data.
+	 */
+	public function test_can_merge_new_fields() {
+		$integration = new Cf7_Extras_Integration_TablePress();
+
+		$table = [
+			'data' => [
+				[
+					'',
+					'header cell',
+				],
+				[
+					'first_name',
+					''
+				]
+			]
+		];
+
+		$form_data = [
+			'first_name' => 'John ',
+			'age' => '25',
+			'food_preferences' => [
+				'pizza',
+				'pasta',
+			],
+		];
+
+		$this->assertEquals(
+			[
+				[ '', 'header cell', 'first_name', 'age', 'food_preferences' ],
+				[ 'first_name', '', '', '', '' ],
+				[ '', '', 'John ', '25', 'pizza, pasta' ],
+			],
+			$integration->get_data_for_table( $table, $form_data )['data']
+		);
+	}
+}