Add Laravel 6 support

Author: dmitry-ivanov

.travis.yml

@@ -1,7 +1,6 @@
 language: php
 
 php:
-  - 7.1
   - 7.2
   - 7.3
 

composer.json

@@ -12,14 +12,14 @@
         "email": "dmitry.g.ivanov@gmail.com"
     }],
     "require": {
-        "php": "^7.1.3",
-        "illuminate/support": "5.8.*",
-        "illuminate/database": "5.8.*",
-        "mockery/mockery": "^1.0"
+        "php": "^7.2",
+        "illuminate/support": "^6.0",
+        "illuminate/database": "^6.0",
+        "mockery/mockery": "^1.2"
     },
     "require-dev": {
-        "phpunit/phpunit": "^7.5|^8.0",
-        "orchestra/testbench": "3.8.*"
+        "phpunit/phpunit": "^8.3",
+        "orchestra/testbench": "^4.0"
     },
     "autoload": {
         "psr-4": {

src/Asserts/EloquentAsserts.php

@@ -113,7 +113,7 @@ protected function assertEloquentHasCreateManyFor($class, $relation, $createMany
         $hasManyRelation = (new $class)->{$relation}();
         $this->assertInstanceOf(HasMany::class, $hasManyRelation);
 
-        $createManyMethod = !empty($createManyMethod) ? $createManyMethod : 'createMany' . title_case($relation);
+        $createManyMethod = !empty($createManyMethod) ? $createManyMethod : 'createMany' . Str::title($relation);
         $this->assertMethodExists($class, $createManyMethod);
 
         $childModel = $hasManyRelation->getRelated();