put test file back since it's used in other repos

src/test.js

@@ -0,0 +1,70 @@
+/* @flow */
+
+import { extendUrl, getScript, memoize } from "@krakenjs/belter/src";
+import { SDK_QUERY_KEYS } from "@paypal/sdk-constants/src";
+
+import { getHost, getPath } from "./global";
+import { getSDKScript, getSDKAttributes } from "./script";
+import { setupLogger } from "./tracking";
+
+type ScriptSettings = {|
+  query?: {
+    [string]: string,
+  },
+  attributes?: {
+    [string]: string,
+  },
+|};
+
+const DEFAULT_QUERY = {
+  [SDK_QUERY_KEYS.CLIENT_ID]: "abcxyz123",
+};
+
+const DEFAULT_ATTRIBUTES = {};
+
+export function insertMockSDKScript({
+  query = DEFAULT_QUERY,
+  attributes = DEFAULT_ATTRIBUTES,
+}: ScriptSettings = {}): string {
+  const scripts = document.querySelectorAll('script[type="test/javascript"]');
+
+  for (const script of scripts) {
+    if (script && script.parentNode) {
+      script.parentNode.removeChild(script);
+    }
+  }
+
+  // $FlowFixMe
+  delete getScript.__inline_memoize_cache__;
+  // $FlowFixMe
+  delete getSDKScript.__inline_memoize_cache__;
+  // $FlowFixMe
+  delete getSDKAttributes.__inline_memoize_cache__;
+
+  const script = document.createElement("script");
+  script.setAttribute("type", "test/javascript");
+  script.setAttribute("id", "test-sdk-script");
+
+  const url = extendUrl(`https://${getHost()}${getPath()}`, {
+    query: {
+      ...DEFAULT_QUERY,
+      ...query,
+    },
+  });
+
+  script.setAttribute("src", url);
+
+  for (const key of Object.keys(attributes)) {
+    script.setAttribute(key, attributes[key]);
+  }
+
+  if (!document.body) {
+    throw new Error(`No document body found`);
+  }
+
+  document.body.appendChild(script); // eslint-disable-line compat/compat
+  memoize.clear();
+  setupLogger();
+
+  return url;
+}