#169: add builtin support for uploading files

tests/httpbin/upload.yml

@@ -0,0 +1,22 @@
+- config:
+    name: test upload file with httpbin
+    request:
+        base_url: https://httpbin.org
+
+- test:
+    name: upload file
+    variable_binds:
+        - field_name: "file"
+        - file_path: "LICENSE"
+        - file_type: "text/html"
+        - multipart_encoder: ${multipart_encoder($field_name, $file_path, $file_type)}
+    request:
+        url: /post
+        method: POST
+        headers:
+            Content-Type: ${multipart_content_type($multipart_encoder)}
+        data: $multipart_encoder
+    validators:
+        - eq: ["status_code", 200]
+        - startswith: ["content.files.file", "MIT License"]
+