Beheer: voeg extra testcase toe voor servers die missen

linter/testcases/servers-empty/expected-output.txt

@@ -0,0 +1,5 @@
+
+/testcases/servers-empty/openapi.json
+ 13:15  error  oas3-api-servers  OpenAPI "servers" must be present and non-empty array.  servers
+
+✖ 1 problem (1 error, 0 warnings, 0 infos, 0 hints)

linter/testcases/servers-empty/openapi.json

@@ -0,0 +1,76 @@
+{
+    "openapi": "3.0.3",
+    "info": {
+        "title": "Baseline",
+        "description": "Deze OpenAPI specification bevat het minimale om aan alle regels te voldoen.",
+        "contact": {
+            "name": "Beheerder",
+            "url": "https://www.example.com",
+            "email": "mail@example.com"
+        },
+        "version": "1.0.0"
+    },
+    "servers": [],
+    "security": [
+        {
+            "default": []
+        }
+    ],
+    "tags": [
+        {
+            "name": "openapi"
+        }
+    ],
+    "paths": {
+        "/openapi.json": {
+            "get": {
+                "tags": [
+                    "openapi"
+                ],
+                "description": "OpenAPI document",
+                "operationId": "getOpenapiJSON",
+                "parameters": [],
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "headers": {
+                            "API-Version": {
+                                "description": "De huidige versie van de applicatie",
+                                "style": "simple",
+                                "schema": {
+                                    "type": "string"
+                                }
+                            },
+                            "access-control-allow-origin": {
+                                "description": "Alle origins mogen bij deze resource",
+                                "schema": {
+                                    "type": "string"
+                                }
+                            }
+                        }
+                    }
+                },
+                "security": [
+                    {
+                        "default": []
+                    }
+                ]
+            }
+        }
+    },
+    "components": {
+        "schemas": {
+        },
+        "securitySchemes": {
+            "default": {
+                "type": "oauth2",
+                "flows": {
+                    "implicit": {
+                        "authorizationUrl": "https://test.com",
+                        "scopes": {}
+                    }
+                }
+            }
+        }
+    }
+}

linter/testcases/servers-missing/expected-output.txt

@@ -1,5 +1,5 @@
 
 /testcases/servers-missing/openapi.json
- 13:15  error  oas3-api-servers  OpenAPI "servers" must be present and non-empty array.  servers
+ 1:1  error  oas3-api-servers  OpenAPI "servers" must be present and non-empty array.
 
 ✖ 1 problem (1 error, 0 warnings, 0 infos, 0 hints)

linter/testcases/servers-missing/openapi.json

@@ -10,7 +10,6 @@
         },
         "version": "1.0.0"
     },
-    "servers": [],
     "security": [
         {
             "default": []