pruneIAB test (issue #392)

src/background/cookiesIAB.js

@@ -132,7 +132,7 @@ function updateIAB(cookie, value, url) {
  * @param {string} signal - the value of an IAB cookie. Example: `1YNN`.
  * @return {string} - Updated IAB value to be set
  */
-function parseIAB(signal) {
+export function parseIAB(signal) {
   if (!isValidSignalIAB(signal)) {
     return "1NYN";
   }

test/background/pruneIAB.test.js

@@ -0,0 +1,34 @@
+import assert from "assert";
+import { parseIAB } from "../../src/background/cookiesIAB.js";
+
+/*
+function parseIAB(signal) {
+  if (!isValidSignalIAB(signal)) {
+    return "1NYN";
+  }
+  if (signal === "1---") {
+    return "1YYY";
+  } else {
+    signal = signal.substr(0, 2) + "Y" + signal.substr(3, 1);
+    return signal;
+  }
+}
+*/
+
+describe("Check parsing of IAB signal", () => {
+    it('Should parse invalid signal to 1NYN', () => {
+        assert.equal(parseIAB("1WYY"), '1NYN');
+    });
+
+    it('Should parse valid signal 1--- to 1YYY', () => {
+        assert.equal(parseIAB("1---"), '1YYY');
+    });
+
+    it('Should change third char in valid signal to Y', () => {
+        assert.equal(parseIAB("1NNN"), '1NYN');
+        assert.equal(parseIAB("1YNY"), '1YYY');
+        assert.equal(parseIAB("1NNY"), '1NYY');
+    });
+
+}) 
+