transforms wrapper.findTest("id") to findTest(wrapper, "id")

blah.js

export default function transformer(file, api) {
  const j = api.jscodeshift;
  const root = j(file.source);

  const run = root
    .find(j.CallExpression, { callee: { property: { name: "findTest" } } })
    .forEach(path => {
      const object = path.value.callee.object;
      const args = path.value.arguments;
      const prop = path.value.callee.property;
      const func = j.callExpression(prop, [object].concat(args));
      path.parent.get("object").replace(func);
    })
    .size();

  if (run) {
    root.find(j.Program).forEach(path => {
      const helperImport = j.importDeclaration([j.importSpecifier(j.identifier("findTest"))], j.literal("lib/test-helpers"));
      path.value.body.unshift(helperImport);
    });
  }

  return run ? root.toSource() : null;
}