Run tests in Laravel 5.0, 5.1, and 5.2

Provide a little more compatibility with Eloquent 5.0, verify unit tests
run and pass when Eloquents 5.0 and 5.1 are loaded, and attempt to test
5.0, 5.1, and 5.2 in Travis.

.travis.yml

@@ -6,5 +6,14 @@ php:
   - "7.0"
   - hhvm
 
+env:
+  - LARAVEL_VERSION="5.0.*"
+  - LARAVEL_VERSION="5.1.*"
+  - LARAVEL_VERSION="5.2.*"
+
 before_script:
   - composer install --dev
+  - composer remove --update-with-dependencies illuminate/database illuminate/support
+  - composer remove --dev --update-with-dependencies illuminate/events
+  - composer require illuminate/database:${LARAVEL_VERSION} illuminate/support:${LARAVEL_VERSION}
+  - composer require --dev illuminate/events:${LARAVEL_VERSION}

src/HasPreferences.php

@@ -70,8 +70,8 @@ public function setPreference($preference, $value)
         // Serialize date and JSON-like preference values.
         if ($this->isPreferenceDateCastable($preference)) {
             $value = $this->fromDateTime($value);
-        } elseif ($this->isPreferenceJsonCastable($preference) && method_exists($this, 'asJson')) {
-            $value = $this->asJson($value);
+        } elseif ($this->isPreferenceJsonCastable($preference)) {
+            $value = method_exists($this, 'asJson') ? $this->asJson($value) : json_encode($value);
         }
 
         /** @var Preference $savedPreference */

tests/HasPreferenceTest.php

@@ -207,7 +207,8 @@ public function provideInternalTypesInputsAndOutputs()
     {
         $date = Carbon::now();
 
-        return [
+        // Eloquent 5.0 and 5.1 compatible casts.
+        $provide = [
             'int cast to int' => ['int-preference', 1234, 'int', 1234],
             'string cast to int' => ['int-preference', '1234', 'int', 1234],
             'integer' => ['integer-preference', 1234, 'int', 1234],
@@ -220,9 +221,15 @@ public function provideInternalTypesInputsAndOutputs()
             'int true cast to bool' => ['bool-preference', 1, 'bool', true],
             'array cast to array' => ['array-preference', [1, 2], 'array', [1, 2]],
             'json cast to array' => ['json-preference', [1, 2], 'array', [1, 2]],
-            'timestamp' => ['timestamp-preference', $date, 'int', $date->timestamp],
             'unknown types don\'t get cast' => ['undefined-type-preference', '1234', 'string', '1234'],
         ];
+
+        // Eloquent 5.2 compatible casts.
+        if (method_exists(new Preference, 'asTimeStamp')) {
+            $provide['timestamp'] = ['timestamp-preference', $date, 'int', $date->timestamp];
+        }
+
+        return $provide;
     }
 
     /**
@@ -251,12 +258,19 @@ public function provideObjectTypesInputsAndOutputs()
         $collection = new Collection(['foo']);
         $date = Carbon::now();
 
-        return [
+        // Eloquent 5.0 compatible casts.
+        $provide = [
             'object' => ['object-preference', $object, 'stdClass', $object],
             'collection' => ['collection-preference', $collection, Collection::class, $collection],
-            'date' => ['date-preference', $date, Carbon::class, $date],
-            'datetime' => ['datetime-preference', $date, Carbon::class, $date],
         ];
+
+        // Eloquent 5.1 compatible casts.
+        if (method_exists(new Preference, 'asDateTime')) {
+            $provide['date'] = ['date-preference', $date, Carbon::class, $date];
+            $provide['datetime'] = ['datetime-preference', $date, Carbon::class, $date];
+        }
+
+        return $provide;
     }
 
     /**