add codegen for nodejs native and instrument snapshot tests

helpers/codegen/generators/__tests__/fixtures.js

@@ -0,0 +1,16 @@
+export const TEST_URL = "https://httpbin.org"
+export const TEST_PATH_NAME = "/path/to"
+export const TEST_QUERY_STRING = "?a=b"
+export const TEST_HTTP_USER = "mockUser"
+export const TEST_HTTP_PASSWORD = "mockPassword"
+export const TEST_BEARER_TOKEN = "abcdefghijklmn"
+export const TEST_RAW_REQUEST_BODY = "foo=bar&baz=qux"
+export const TEST_RAW_PARAMS_JSON = '{"foo": "bar", "baz": "qux"}'
+export const TEST_RAW_PARAMS_XML = `<?xml version=\'1.0\' encoding=\'utf-8\'?>
+<xml>
+  <element foo="bar"></element>
+</xml>`
+export const TEST_HEADERS = [
+  { key: "h1", value: "h1v" },
+  { key: "h2", value: "h2v" },
+]