Add test for getModifiedHref

lib/getModifiedHref.js

@@ -5,6 +5,15 @@ const {
   buildRelativeUrl,
 } = require('urltools');
 
+/**
+ *
+ * @param {string} href
+ * @param {string} from
+ * @param {string} to
+ * @param {string} root
+ *
+ * @returns {string}
+ */
 function getModifiedHref(href, from, to, root) {
   switch (getHrefType(href)) {
     case hrefTypes.ABSOLUTE:

test/getModifiedHref.js

@@ -0,0 +1,43 @@
+const expect = require('unexpected');
+const getModifiedHref = require('../lib/getModifiedHref');
+
+const root = 'file:///local/filesystem/path/';
+
+describe('getModifiedHref', () => {
+  it('should handle absolute urls', () => {
+    expect(
+      getModifiedHref(
+        'https://hyperlink/to',
+        `${root}/from`,
+        'https://hyperlink/to',
+        root
+      ),
+      'to be',
+      'https://hyperlink/to'
+    );
+  });
+
+  it('should handle protocol relative urls', () => {
+    expect(
+      getModifiedHref('//hyperlink/to', `${root}/from`, '//hyperlink/to', root),
+      'to be',
+      '//hyperlink/to'
+    );
+  });
+
+  it('should handle root relative urls', () => {
+    expect(
+      getModifiedHref('/to', `${root}/from`, `${root}/to`, root),
+      'to be',
+      '/to'
+    );
+  });
+
+  it('should handle relative urls', () => {
+    expect(
+      getModifiedHref('to', `${root}/from`, `${root}/to`, root),
+      'to be',
+      'to'
+    );
+  });
+});