Prepare project to work only with PHP8

.php_cs

@@ -2,7 +2,7 @@
 $finder = PhpCsFixer\Finder::create()
     ->exclude('vendor')
     ->in(__DIR__);
-return PhpCsFixer\Config::create()
+return (new PhpCsFixer\Config())
     ->setUsingCache(true)
     ->setRules([
         '@PSR2' => true,
@@ -14,7 +14,7 @@ return PhpCsFixer\Config::create()
         'indentation_type' => true,
         'blank_line_after_namespace' => true,
         'line_ending' => true,
-        'lowercase_constants' => true,
+        //'lowercase_constants' => true,
         'lowercase_keywords' => true,
         'no_closing_tag' => true,
         'single_line_after_imports' => true,
@@ -23,16 +23,16 @@ return PhpCsFixer\Config::create()
         'whitespace_after_comma_in_array' => true,
         'blank_line_after_opening_tag' => true,
         'no_empty_statement' => true,
-        'no_extra_consecutive_blank_lines' => true,
+        // 'no_extra_consecutive_blank_lines' => true,
         'function_typehint_space' => true,
         'no_leading_namespace_whitespace' => true,
         'no_blank_lines_after_class_opening' => true,
         'no_blank_lines_after_phpdoc' => true,
         'phpdoc_scalar' => true,
         'phpdoc_types' => true,
         'no_leading_import_slash' => true,
-        'no_extra_consecutive_blank_lines' => ['use'],
-        'blank_line_before_return' => true,
+        // 'no_extra_consecutive_blank_lines' => ['use'],
+        //'blank_line_before_return' => true,
         'self_accessor' => false,
         'no_short_bool_cast' => true,
         'no_trailing_comma_in_singleline_array' => true,
@@ -48,5 +48,6 @@ return PhpCsFixer\Config::create()
         'array_syntax' => ['syntax' => 'short'],
         'declare_strict_types' => true,
         'phpdoc_align' => true,
+        'php_unit_no_expectation_annotation' => true,
     ])
     ->setFinder($finder);

.travis.yml

@@ -3,12 +3,13 @@ language: php
 dist: trusty
 
 php:
- - 7.2
  - 7.3
+ - 7.4
+ - nightly
 
 matrix:
  include:
-  - php: 7.2
+  - php: 7.4
     env: COVERAGE=yes
 
 cache:
@@ -17,6 +18,7 @@ cache:
 
 before_script:
  - composer self-update
+ - composer install --ignore-platform-reqs
  - if [[ $COVERAGE == yes ]]; then curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter; fi
  - if [[ $COVERAGE == yes ]]; then chmod +x ./cc-test-reporter; fi
  - if [[ $COVERAGE == yes ]]; then ./cc-test-reporter before-build; fi

composer.json

@@ -2,13 +2,13 @@
   "name": "widmogrod/php-functional",
   "description": "Functors, Applicative and Monads are fascinating concept. Purpose of this library is to explore them in OOP PHP world.",
   "require": {
-    "php": "^7.1|^8.0",
+    "php": "^7.3|^8.0",
     "functional-php/fantasy-land": "^1"
   },
   "require-dev": {
-    "phpunit/phpunit": "^6",
-    "friendsofphp/php-cs-fixer": "^2",
-    "giorgiosironi/eris": "^0.9"
+    "phpunit/phpunit": "^9",
+    "friendsofphp/php-cs-fixer": "^3.0.x-dev",
+    "giorgiosironi/eris": "^0.11"
   },
   "license": "MIT",
   "authors": [
@@ -17,7 +17,7 @@
       "email": "widmogrod@gmail.com"
     }
   ],
-  "prefer-stable": true,
+  "prefer-stable": false,
   "scripts": {
     "test": "phpunit --no-coverage",
     "testc": "phpunit --coverage-clover ./clover.xml",