Merge pull request #34 from DeepDiver1975/fix/33

fix: exporting an unknown group no longer results in ErrorException

.gitignore

@@ -3,3 +3,4 @@ composer.phar
 composer.lock
 .DS_Store
 database.sqlite
+.phpunit.result.cache

src/Exporter.php

@@ -144,7 +144,7 @@ public static function run(string $group = 'metrics')
             static::$registeredMetrics[$metricClass] = $metric;
         }
 
-        return static::$registries[$group];
+        return static::$registries[$group] ?? new CollectorRegistry(new InMemory);
     }
 
     /**

tests/MetricTest.php

@@ -9,7 +9,7 @@
 
 class MetricTest extends TestCase
 {
-    public function test_registering_metric()
+    public function test_registering_metric(): void
     {
         Exporter::metrics([TestMetric::class]);
         Exporter::metrics([TestMetric::class]);
@@ -38,7 +38,7 @@ public function test_registering_metric()
             ->assertDontSee('laravel_test_metric');
     }
 
-    public function test_metrics_modification_without_update()
+    public function test_metrics_modification_without_update(): void
     {
         Exporter::metrics([OutsideMetric::class]);
 
@@ -57,7 +57,7 @@ public function test_metrics_modification_without_update()
         );
     }
 
-    public function test_response_with_plain_text()
+    public function test_response_with_plain_text(): void
     {
         Exporter::metrics([OutsideMetric::class]);
 
@@ -78,7 +78,7 @@ public function test_response_with_plain_text()
         );
     }
 
-    public function test_response_with_plain_text_on_different_group()
+    public function test_response_with_plain_text_on_different_group(): void
     {
         Exporter::metrics([OutsideMetric::class]);
 
@@ -103,4 +103,10 @@ public function test_response_with_plain_text_on_different_group()
             Exporter::exportAsPlainText('metrics2')
         );
     }
+
+    public function test_unknown_group(): void
+    {
+        $registry = Exporter::run('you-dont-know-me');
+        self::assertNotNull($registry);
+    }
 }