From a67d1901c052fd3edcb0d44a7d9d5df7f296390e Mon Sep 17 00:00:00 2001
From: Tom Byers <tombaromba@gmail.com>
Date: Thu, 29 Aug 2019 10:58:27 +0100
Subject: [PATCH] Add mock for window.location

---
 tests/javascripts/support/helpers.js         |  2 +
 tests/javascripts/support/helpers/globals.js | 89 ++++++++++++++++++++
 2 files changed, 91 insertions(+)
 create mode 100644 tests/javascripts/support/helpers/globals.js

diff --git a/tests/javascripts/support/helpers.js b/tests/javascripts/support/helpers.js
index fe5adf08e..c86772626 100644
--- a/tests/javascripts/support/helpers.js
+++ b/tests/javascripts/support/helpers.js
@@ -1,3 +1,4 @@
+const globals = require('./helpers/globals.js');
 const events = require('./helpers/events.js');
 const domInterfaces = require('./helpers/dom_interfaces.js');
 const html = require('./helpers/html.js');
@@ -5,6 +6,7 @@ const elements = require('./helpers/elements.js');
 const rendering = require('./helpers/rendering.js');
 const forms = require('./helpers/forms.js');
 
+exports.LocationMock = globals.LocationMock;
 exports.triggerEvent = events.triggerEvent;
 exports.clickElementWithMouse = events.clickElementWithMouse;
 exports.moveSelectionToRadio = events.moveSelectionToRadio;
diff --git a/tests/javascripts/support/helpers/globals.js b/tests/javascripts/support/helpers/globals.js
new file mode 100644
index 000000000..89fa44e08
--- /dev/null
+++ b/tests/javascripts/support/helpers/globals.js
@@ -0,0 +1,89 @@
+// helpers for mocking objects attached to the global space as properties, ie. window.location
+
+class LocationMock {
+
+  constructor (URL) {
+
+    this._location = window.location;
+
+    // setting href sets all sub-properties
+    this.href = URL;
+
+    // JSDOM sets window.location as non-configurable
+    // the only way to mock it, currently, is to replace it completely
+    delete window.location;
+    window.location = this;
+
+  }
+
+  get href () {
+
+    return `${this.protocol}://${this.host}${this.pathname}${this.search}${this.hash}`
+
+  }
+
+  set href (value) {
+
+    const partNames = ['protocol', 'hostname', 'port', 'pathname', 'search', 'hash'];
+
+    const protocol = '(https:|http:)';
+    const hostname = '[^\\/]+';
+    const port = '(:\\d)';
+    const pathname = '([^?]+)';
+    const search = '([^#])';
+    const hash = '(#[\\x00-\\x7F])'; // match any ASCII character
+
+    const re = new RegExp(`^${protocol}{0,1}(?:\\/\\/){0,1}(${hostname}${port}{0,1}){0,1}${pathname}{0,1}${search}{0,1}${hash}{0,1}$`);
+    const match = value.match(re)
+
+    if (match === null) { throw Error(`${value} is not a valid URL`); }
+
+    match.forEach((part, idx) => {
+
+      let partName;
+
+      // 0 index is whole match, we want the groups
+      if (idx > 0) {
+        partName = partNames[idx - 1];
+
+        if (part !== undefined) {
+          this[partName] = part;
+        } else if (!(partName in this)) { // only get value from window.location if property not set
+          this[partName] = this._location[partName];
+        }
+      }
+
+    });
+
+  }
+
+  get host () {
+
+    return `${this.hostname}:${this.port}`;
+
+  }
+
+  set host (value) {
+
+    const parts = value.split(':');
+
+    this.hostname = parts[0];
+    this.protocol = parts[1];
+
+  }
+
+  // origin is read-only
+  get origin () {
+
+    return `${this.protol}://${this.hostname}`;
+
+  }
+
+  reset () {
+
+    window.location = this._location;
+
+  }
+}
+
+exports.LocationMock = LocationMock;