Add support for PHPUnit 6.x, remove 4.x

PHP 5.5 and PHPUnit 4 are both unsupported now.

Author: danmichaelo

.travis.yml

@@ -1,9 +1,9 @@
 language: php
 
 php:
-  - 5.5
   - 5.6
   - 7.0
+  - 7.1
 
 before_script:
  - composer install --dev -o -n

composer.json

@@ -11,12 +11,12 @@
         }
     ],
     "require": {
-        "php": ">=5.5",
+        "php": ">=5.6",
         "ck/File_MARC_Reference": "^1.0",
         "pear/file_marc": "^1.1"
     },
     "require-dev": {
-        "phpunit/phpunit": "^4.8 | ^5.5"
+        "phpunit/phpunit": "^5.7 | ^6.0"
     },
     "autoload": {
         "psr-4": {

tests/CollectionTest.php

@@ -2,10 +2,10 @@
 
 namespace Scriptotek\Marc\Record;
 
-use PHPUnit_Framework_TestCase;
+use PHPUnit\Framework\TestCase;
 use Scriptotek\Marc\Collection;
 
-class CollectionTest extends PHPUnit_Framework_TestCase
+class CollectionTest extends TestCase
 {
     public function testEmptyCollection()
     {

tests/FieldsTest.php

@@ -1,8 +1,9 @@
 <?php
 
+use PHPUnit\Framework\TestCase;
 use Scriptotek\Marc\Record;
 
-class IsbnFieldTest extends \PHPUnit_Framework_TestCase
+class IsbnFieldTest extends TestCase
 {
     public function testIsbn()
     {

tests/QueryResultTest.php

@@ -1,9 +1,10 @@
 <?php
 
+use PHPUnit\Framework\TestCase;
 use Scriptotek\Marc\Record;
 use Scriptotek\Marc\QueryResult;
 
-class QueryResultTest extends \PHPUnit_Framework_TestCase
+class QueryResultTest extends TestCase
 {
     protected $record;
 

tests/RecordTest.php

@@ -1,9 +1,10 @@
 <?php
 
+use PHPUnit\Framework\TestCase;
 use Scriptotek\Marc\Marc21;
 use Scriptotek\Marc\Record;
 
-class RecordTest extends \PHPUnit_Framework_TestCase
+class RecordTest extends TestCase
 {
     public function testExampleWithNs()
     {

tests/SubjectFieldTest.php

@@ -1,10 +1,11 @@
 <?php
 
+use PHPUnit\Framework\TestCase;
 use Scriptotek\Marc\Collection;
 use Scriptotek\Marc\Fields\Subject;
 use Scriptotek\Marc\Fields\UncontrolledSubject;
 
-class SubjectFieldTest extends \PHPUnit_Framework_TestCase
+class SubjectFieldTest extends TestCase
 {
     protected function getNthrecord($n)
     {

tests/TitleFieldTest.php

@@ -1,8 +1,9 @@
 <?php
 
+use PHPUnit\Framework\TestCase;
 use Scriptotek\Marc\Fields\Title;
 
-class TitleFieldTest extends \PHPUnit_Framework_TestCase
+class TitleFieldTest extends TestCase
 {
     /*
         In records formulated according to ISBD principles, subfield $b contains