improve tests coverage

Author: d8vjork

src/CompressionEncoding.php

@@ -50,10 +50,6 @@ public function isSupported(): ?string
 
         $attributes = $reflector->getAttributes(EncoderAsFunction::class);
 
-        if (count($attributes) === 0) {
-            return null;
-        }
-        
         /** @var \OpenSoutheners\LaravelResponseCompression\EncoderAsFunction $attribute */
         $attribute = $attributes[0]->newInstance();
 

tests/CompressionEncodingTest.php

@@ -1,21 +1,44 @@
 <?php
 
-namespace OpenSoutheners\LaravelResponseCompression\Tests;
-
-use OpenSoutheners\LaravelResponseCompression\CompressionEncoding;
-use PHPUnit\Framework\TestCase;
+namespace OpenSoutheners\LaravelResponseCompression
+{
+    function function_exists(string $name): bool {
+        if (getenv('FUNCTION_EXISTS_MOCK')) {
+            return false;
+        }
+        
+        return \function_exists($name);
+    }
+}
 
-class CompressionEncodingTest extends TestCase
+namespace OpenSoutheners\LaravelResponseCompression\Tests
 {
-    public function testCompressionEncodingListSupportedReturnsArray()
+    use OpenSoutheners\LaravelResponseCompression\CompressionEncoding;
+    use PHPUnit\Framework\TestCase;
+    
+    class CompressionEncodingTest extends TestCase
     {
-        $supportedList = CompressionEncoding::listSupported();
+        public function testCompressionEncodingListSupportedReturnsArray()
+        {
+            $supportedList = CompressionEncoding::listSupported();
+            
+            $this->assertIsArray($supportedList);
+            $this->assertArrayHasKey(CompressionEncoding::Deflate->value, $supportedList);
+            $this->assertEmpty(array_diff(
+                array_map(fn ($case) => $case->value, CompressionEncoding::cases()),
+                array_keys($supportedList),
+            ));
+        }
 
-        $this->assertIsArray($supportedList);
-        $this->assertArrayHasKey(CompressionEncoding::Deflate->value, $supportedList);
-        $this->assertEmpty(array_diff(
-            array_map(fn ($case) => $case->value, CompressionEncoding::cases()),
-            array_keys($supportedList),
-        ));
+        public function testCompressionEncodingIsSupportedGetsNullWhenNonPresent()
+        {
+            putenv('FUNCTION_EXISTS_MOCK=1');
+
+            $supported = CompressionEncoding::Lz4->isSupported();
+            
+            putenv('FUNCTION_EXISTS_MOCK=');
+            
+            $this->assertNull($supported);
+        }
     }
 }