diff --git a/cmd/convert.go b/cmd/convert.go
index f347c27..55f013e 100644
--- a/cmd/convert.go
+++ b/cmd/convert.go
@@ -34,7 +34,7 @@ func init() {
 	convertCmd.PersistentFlags().BoolVar(&debug, "v", false, "Enable to get verbose output")
 }
 
-func convert(cmd *cobra.Command, args []string) {
+func convert(_ *cobra.Command, _ []string) {
 	log.Verbose = debug
 
 	if fromVersion != 2 || toVersion != 3 {
@@ -42,11 +42,12 @@ func convert(cmd *cobra.Command, args []string) {
 		os.Exit(1)
 	}
 
-	log.Info("Loading file " + inputFile)
+	log.Info("Loading file " + convertFile)
 	var doc openapi2.T
 	input, err := os.ReadFile(convertFile)
 	if err != nil {
-		panic(err)
+		log.Error(err.Error())
+		os.Exit(1)
 	}
 	err = yaml.Unmarshal(input, &doc)
 	if err != nil {
@@ -64,6 +65,7 @@ func convert(cmd *cobra.Command, args []string) {
 	json, err := yaml.Marshal(newDoc)
 	if err != nil {
 		log.Error(err.Error())
+		os.Exit(1)
 	}
 	_ = os.WriteFile(outputFile, json, 0666)
 }
diff --git a/cmd/convert_internal_test.go b/cmd/convert_internal_test.go
new file mode 100644
index 0000000..3769d3e
--- /dev/null
+++ b/cmd/convert_internal_test.go
@@ -0,0 +1,17 @@
+package cmd
+
+import (
+	"testing"
+)
+
+func Test_convert(t *testing.T) {
+	t.Run("petstore_minimal.yaml", func(t *testing.T) {
+		inputFile = "./testdata/petstore_minimal.yaml"
+		convertFile = "./testdata/petstore_minimal.yaml"
+		fromVersion = 2
+		toVersion = 3
+		outputFile = t.TempDir() + "out.yaml"
+
+		convert(nil, nil)
+	})
+}
diff --git a/cmd/testdata/petstore_minimal.yaml b/cmd/testdata/petstore_minimal.yaml
new file mode 100644
index 0000000..2cff013
--- /dev/null
+++ b/cmd/testdata/petstore_minimal.yaml
@@ -0,0 +1,142 @@
+swagger: "2.0"
+info:
+  version: 1.0.0
+  title: Swagger Petstore
+  description: A sample API that uses a petstore as an example to demonstrate features in the swagger-2.0 specification
+  termsOfService: http://swagger.io/terms/
+  contact:
+    name: Swagger API Team
+    email: apiteam@swagger.io
+    url: http://swagger.io
+  license:
+    name: Apache 2.0
+    url: https://www.apache.org/licenses/LICENSE-2.0.html
+host: petstore.swagger.io
+basePath: /api
+schemes:
+  - http
+consumes:
+  - application/json
+produces:
+  - application/json
+paths:
+  /pets:
+    get:
+      description: |
+        Returns all pets from the system that the user has access to
+      operationId: findPets
+      parameters:
+        - name: tags
+          in: query
+          description: tags to filter by
+          required: false
+          type: array
+          collectionFormat: csv
+          items:
+            type: string
+        - name: limit
+          in: query
+          description: maximum number of results to return
+          required: false
+          type: integer
+          format: int32
+      responses:
+        "200":
+          description: pet response
+          schema:
+            type: array
+            items:
+              $ref: '#/definitions/Pet'
+        default:
+          description: unexpected error
+          schema:
+            $ref: '#/definitions/Error'
+    post:
+      description: Creates a new pet in the store.  Duplicates are allowed
+      operationId: addPet
+      parameters:
+        - name: pet
+          in: body
+          description: Pet to add to the store
+          required: true
+          schema:
+            $ref: '#/definitions/NewPet'
+      responses:
+        "200":
+          description: pet response
+          schema:
+            $ref: '#/definitions/Pet'
+        default:
+          description: unexpected error
+          schema:
+            $ref: '#/definitions/Error'
+  /pets/{id}:
+    get:
+      description: Returns a user based on a single ID, if the user does not have access to the pet
+      operationId: find pet by id
+      parameters:
+        - name: id
+          in: path
+          description: ID of pet to fetch
+          required: true
+          type: integer
+          format: int64
+      responses:
+        "200":
+          description: pet response
+          schema:
+            $ref: '#/definitions/Pet'
+        default:
+          description: unexpected error
+          schema:
+            $ref: '#/definitions/Error'
+    delete:
+      description: deletes a single pet based on the ID supplied
+      operationId: deletePet
+      parameters:
+        - name: id
+          in: path
+          description: ID of pet to delete
+          required: true
+          type: integer
+          format: int64
+      responses:
+        "204":
+          description: pet deleted
+        default:
+          description: unexpected error
+          schema:
+            $ref: '#/definitions/Error'
+definitions:
+  Pet:
+    allOf:
+      - $ref: '#/definitions/NewPet'
+      - required:
+        - id
+        type: "object"
+        properties:
+          id:
+            type: integer
+            format: int64
+
+  NewPet:
+    type: "object"
+    required:
+      - name  
+    properties:
+      name:
+        type: string
+      tag:
+        type: string    
+
+  Error:
+    type: "object"
+    required:
+      - code
+      - message
+    properties:
+      code:
+        type: integer
+        format: int32
+      message:
+        type: string
\ No newline at end of file