Add tests files

tests/get-wp-version.php

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+<?php
+
+$ch = curl_init();
+curl_setopt( $ch, CURLOPT_URL, 'https://api.wordpress.org/core/version-check/1.7/' );
+
+// Set so curl_exec returns the result instead of outputting it.
+curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );
+
+// Get the response and close the channel.
+$response = curl_exec( $ch );
+curl_close( $ch );
+
+$versions = json_decode( $response );
+$versions = $versions->offers;
+
+// Sorting available WordPress offers by version number
+function offer_version_sort( $first, $second ) {
+	return version_compare( $first->version, $second->version, '<' );
+}
+
+uasort( $versions, 'offer_version_sort' );
+
+$version_stack = array();
+
+foreach( $versions as $offer ) {
+	list( $major, $minor ) = explode( '.',  $offer->version );
+
+	$base = $major . '.' . $minor;
+
+	if (
+		! isset( $version_stack[ $base ] )
+		|| version_compare( $offer->version, $version_stack[ $base ] ) ) {
+
+		// There is no version like this yet or there is a newer patch to this major version
+		$version_stack[ $base ] = $offer->version;
+	}
+
+	if ( count( $version_stack ) === 2 ) {
+		break;
+	}
+}
+
+$wp_versions = array_values( $version_stack );
+
+if ( empty( $argv[1] ) ) {
+	print $wp_versions[0] . "\n";
+} else if ( '--previous' === $argv[1] ) {
+	print $wp_versions[1] . "\n";
+} else {
+	die(
+		"Unknown argument: " . $argv[1] . "\n"
+		. "Use with no arguments to get the latest stable WordPress version, or use `--previous' to get the previous stable major release.\n"
+	);
+}

tests/prepare-wordpress.sh

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+#!/bin/bash
+
+# If this is an NPM environment test we don't need a developer WordPress checkout
+
+if [ "$WP_TRAVISCI" != "phpunit" ]; then
+	exit 0;
+fi
+
+# This prepares a developer checkout of WordPress for running the test suite on Travis
+
+mysql -u root -e "CREATE DATABASE wordpress_tests;"
+
+CURRENT_DIR=$(pwd)
+
+for WP_SLUG in 'master' 'latest' 'previous'; do
+	echo "Preparing $WP_SLUG WordPress...";
+
+	cd $CURRENT_DIR/..
+
+	case $WP_SLUG in
+	master)
+		git clone --depth=1 --branch master git://develop.git.wordpress.org/ /tmp/wordpress-master
+		;;
+	latest)
+		git clone --depth=1 --branch `php ./$PLUGIN_SLUG/tests/get-wp-version.php` git://develop.git.wordpress.org/ /tmp/wordpress-latest
+		;;
+	previous)
+		git clone --depth=1 --branch `php ./$PLUGIN_SLUG/tests/get-wp-version.php --previous` git://develop.git.wordpress.org/ /tmp/wordpress-previous
+		;;
+	esac
+
+	cp -r $PLUGIN_SLUG "/tmp/wordpress-$WP_SLUG/src/wp-content/plugins/$PLUGIN_SLUG"
+	cd /tmp/wordpress-$WP_SLUG
+
+	cp wp-tests-config-sample.php wp-tests-config.php
+	sed -i "s/youremptytestdbnamehere/wordpress_tests/" wp-tests-config.php
+	sed -i "s/yourusernamehere/root/" wp-tests-config.php
+	sed -i "s/yourpasswordhere//" wp-tests-config.php
+
+	echo "Done!";
+done
+
+exit 0;