diff --git a/test/unit/resolveurl.html b/test/unit/resolveurl.html
index 26d708b682..1794c28725 100644
--- a/test/unit/resolveurl.html
+++ b/test/unit/resolveurl.html
@@ -170,6 +170,38 @@
     assert.equal(actual, expected);
   });
 
+  test('resolveUrl when called with relative url and a bad baseURI', function () {
+    const el = document.querySelector('x-resolve');
+    const expected = 'relative/path.png';
+    const actual =
+        el.resolveUrl('relative/path.png', '/not/a/full/uri');
+    assert.equal(actual, expected);
+  });
+
+  test('resolveUrl when called with a full url and a bad baseURI', function () {
+    const el = document.querySelector('x-resolve');
+    const expected = 'https://example.com/foo.png';
+    const actual =
+        el.resolveUrl('https://example.com/foo.png', '/not/a/full/uri');
+    assert.equal(actual, expected);
+  });
+
+  test('resolveUrl when called with a protocol-relative url and a bad baseURI', function () {
+    const el = document.querySelector('x-resolve');
+    const expected = '//example.com/foo.png';
+    const actual =
+        el.resolveUrl('//example.com/foo.png', '/not/a/full/uri');
+    assert.equal(actual, expected);
+  });
+
+  test('resolveUrl when called with a garbage url', function () {
+    const el = document.querySelector('x-resolve');
+    const expected = '.../foo.png';
+    const actual =
+        el.resolveUrl('.../foo.png', 'https://example.org/bar');
+    assert.equal(actual, expected);
+  });
+
   test('resolveUrl api with assetpath', function() {
     var el = document.createElement('p-r-ap');
     // Manually calculate expected URL, to avoid dependence on