diff --git a/acceptance.bats b/acceptance.bats
index ca49c6f..a9d3bcd 100755
--- a/acceptance.bats
+++ b/acceptance.bats
@@ -36,7 +36,7 @@ resetCacheFolder() {
 }
 
 @test "Pass when parsing a valid Kubernetes config JSON file" {
-  run bin/kubeconform -kubernetes-version 1.17.1 -summary fixtures/valid.json
+  run bin/kubeconform -kubernetes-version 1.20.0 -summary fixtures/valid.json
   [ "$status" -eq 0 ]
   [ "$output" = "Summary: 1 resource found in 1 file - Valid: 1, Invalid: 0, Errors: 0, Skipped: 0" ]
 }
@@ -134,17 +134,17 @@ resetCacheFolder() {
 }
 
 @test "Fail when parsing a config with additional properties and strict set" {
-  run bin/kubeconform -strict -kubernetes-version 1.16.0 fixtures/extra_property.yaml
+  run bin/kubeconform -strict -kubernetes-version 1.20.0 fixtures/extra_property.yaml
   [ "$status" -eq 1 ]
 }
 
 @test "Fail when parsing a config with duplicate properties and strict set" {
-  run bin/kubeconform -strict -kubernetes-version 1.16.0 fixtures/duplicate_property.yaml
+  run bin/kubeconform -strict -kubernetes-version 1.20.0 fixtures/duplicate_property.yaml
   [ "$status" -eq 1 ]
 }
 
 @test "Pass when parsing a config with duplicate properties and strict NOT set" {
-  run bin/kubeconform -kubernetes-version 1.16.0 fixtures/duplicate_property.yaml
+  run bin/kubeconform -kubernetes-version 1.20.0 fixtures/duplicate_property.yaml
   [ "$status" -eq 0 ]
 }
 
diff --git a/fixtures/valid.json b/fixtures/valid.json
index deb3101..e7a5dcb 100644
--- a/fixtures/valid.json
+++ b/fixtures/valid.json
@@ -1,46 +1,34 @@
 {
-   "apiVersion": "apps/v1beta1",
-   "kind": "Deployment",
-   "metadata": {
-      "name": "nginx-deployment",
-      "namespace": "default"
-   },
-   "spec": {
-      "replicas": 2,
-      "template": {
-         "spec": {
-            "affinity": { },
-            "containers": [
-               {
-                  "args": [ ],
-                  "command": [ ],
-                  "env": [ ],
-                  "envFrom": [ ],
-                  "image": "nginx:1.7.9",
-                  "lifecycle": { },
-                  "livenessProbe": { },
-                  "name": "nginx",
-                  "ports": [
-                     {
-                        "containerPort": 80,
-                        "name": "http"
-                     }
-                  ],
-                  "readinessProbe": { },
-                  "resources": { },
-                  "securityContext": { },
-                  "volumeMounts": [ ]
-               }
-            ],
-            "hostMappings": [ ],
-            "imagePullSecrets": [ ],
-            "initContainers": [ ],
-            "nodeSelector": { },
-            "securityContext": { },
-            "tolerations": [ ],
-            "volumes": [ ]
-         }
+  "apiVersion": "v1",
+  "kind": "ReplicationController",
+  "metadata": {
+    "name": "bob"
+  },
+  "spec": {
+    "replicas": 2,
+    "selector": {
+      "app": "nginx"
+    },
+    "template": {
+      "metadata": {
+        "name": "nginx",
+        "labels": {
+          "app": "nginx"
+        }
+      },
+      "spec": {
+        "containers": [
+          {
+            "name": "nginx",
+            "image": "nginx",
+            "ports": [
+              {
+                "containerPort": 80
+              }
+            ]
+          }
+        ]
       }
-   },
-   "status": { }
+    }
+  }
 }
diff --git a/scripts/acceptance.bats b/scripts/acceptance.bats
index c210d45..4398c4e 100644
--- a/scripts/acceptance.bats
+++ b/scripts/acceptance.bats
@@ -72,3 +72,10 @@ setup() {
   run diff prometheus_v1.json ./fixtures/prometheus_v1-denyRootAdditionalProperties.json
   [ "$status" -eq 0 ]
 }
+
+@test "Should output an error if no file is passed" {
+  run ./openapi2jsonschema.py
+  [ "$status" -eq 1 ]
+  [ "${lines[0]}" == 'Missing FILE parameter.' ]
+  [ "${lines[1]}" == 'Usage: ./openapi2jsonschema.py [FILE]' ]
+}
diff --git a/scripts/openapi2jsonschema.py b/scripts/openapi2jsonschema.py
index 9d981b4..6cda017 100755
--- a/scripts/openapi2jsonschema.py
+++ b/scripts/openapi2jsonschema.py
@@ -122,8 +122,8 @@ def construct_value(load, node):
 
 
 if __name__ == "__main__":
-  if len(sys.argv) == 0:
-      print("missing file")
+  if len(sys.argv) < 2:
+      print('Missing FILE parameter.\nUsage: %s [FILE]' % sys.argv[0])
       exit(1)
 
   for crdFile in sys.argv[1:]: