started test driving data collector util

jest.config.js

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+module.exports = {
+  testEnvironment: "jsdom",
+};

src/data-collector.js

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+export const FRAUDNET_FNCLS = "fnparams-dede7cc5-15fd-4c75-a9f4-36c430ee3a99";
+export const FRAUDNET_APP_NAME = "SMART_PAYMENT_BUTTONS";
+
+export const loadDataCollector = async (options) => {
+  const configScript = document.createElement("script");
+  configScript.setAttribute("nonce", options.cspNonce);
+  configScript.setAttribute("type", "application/json");
+  configScript.setAttribute("id", "fconfig");
+  configScript.setAttribute("fncls", FRAUDNET_FNCLS);
+};

test/server/data-collector.test.js

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+/**
+ * @jest-environment jsdom
+ */
+import {
+  loadDataCollector,
+  FRAUDNET_FNCLS,
+  FRAUDNET_APP_NAME,
+} from "../../src/data-collector";
+
+describe.only("data-collector.js", () => {
+  test("it create the config element with correct inputs", async () => {
+    const mockSetAttribute = jest.fn();
+    const mockReturnedElement = {
+      setAttribute: mockSetAttribute,
+    };
+    document.createElement = jest.fn(() => {
+      return mockReturnedElement;
+    });
+    const inputs = {
+      clientMetadataId: "some-cmid",
+      fraudnetAppName: "spb-test-name",
+      env: "unit-tests",
+      cspNonce: "not-sure-what-this-is-yet-csp-nonce",
+      queryStringParams: {
+        /* TBD */
+      },
+    };
+
+    const expectedScriptConfig = {
+      f: inputs.clientMetadataId,
+      s: FRAUDNET_APP_NAME,
+      //u: <NOT SURE THIS IS RELEVANT! Does it currently default in spb?>
+      cb1: "fnCallback",
+    };
+    await loadDataCollector(inputs);
+    // assert script created with certain attributes
+    expect(document.createElement).toBeCalledWith("script");
+    expect(mockSetAttribute).toBeCalledWith("nonce", inputs.cspNonce);
+    expect(mockSetAttribute).toBeCalledWith("type", "application/json");
+    expect(mockSetAttribute).toBeCalledWith("id", "fconfig");
+    expect(mockSetAttribute).toBeCalledWith("fncls", FRAUDNET_FNCLS);
+    expect(mockReturnedElement.textContent).toEqual(
+      JSON.stringify({ expectedScriptConfig })
+    );
+  });
+});