diff --git a/package-lock.json b/package-lock.json
index de02736..f699b11 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
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+    },
     "lodash.template": {
       "version": "4.4.0",
       "resolved": "https://registry.npmjs.org/lodash.template/-/lodash.template-4.4.0.tgz",
@@ -7907,7 +7939,7 @@
     },
     "magic-string": {
       "version": "0.22.5",
-      "resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.22.5.tgz",
+      "resolved": "http://registry.npmjs.org/magic-string/-/magic-string-0.22.5.tgz",
       "integrity": "sha512-oreip9rJZkzvA8Qzk9HFs8fZGF/u7H/gtrE8EN6RjKJ9kh2HlC+yQ2QezifqTZfGyiuAV0dRv5a+y/8gBb1m9w==",
       "dev": true,
       "requires": {
@@ -10351,7 +10383,7 @@
     },
     "postcss-discard-unused": {
       "version": "2.2.3",
-      "resolved": "https://registry.npmjs.org/postcss-discard-unused/-/postcss-discard-unused-2.2.3.tgz",
+      "resolved": "http://registry.npmjs.org/postcss-discard-unused/-/postcss-discard-unused-2.2.3.tgz",
       "integrity": "sha1-vOMLLMWR/8Y0Mitfs0ZLbZNPRDM=",
       "dev": true,
       "requires": {
@@ -10373,7 +10405,7 @@
         },
         "chalk": {
           "version": "1.1.3",
-          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "resolved": "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
           "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
           "dev": true,
           "requires": {
@@ -10386,7 +10418,7 @@
           "dependencies": {
             "supports-color": {
               "version": "2.0.0",
-              "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
+              "resolved": "http://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
               "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
               "dev": true
             }
@@ -10418,7 +10450,7 @@
         },
         "strip-ansi": {
           "version": "3.0.1",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "dev": true,
           "requires": {
@@ -10459,7 +10491,7 @@
         },
         "chalk": {
           "version": "1.1.3",
-          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "resolved": "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
           "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
           "dev": true,
           "requires": {
@@ -10472,7 +10504,7 @@
           "dependencies": {
             "supports-color": {
               "version": "2.0.0",
-              "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
+              "resolved": "http://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
               "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
               "dev": true
             }
@@ -10504,7 +10536,7 @@
         },
         "strip-ansi": {
           "version": "3.0.1",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "dev": true,
           "requires": {
@@ -10524,7 +10556,7 @@
     },
     "postcss-merge-idents": {
       "version": "2.1.7",
-      "resolved": "https://registry.npmjs.org/postcss-merge-idents/-/postcss-merge-idents-2.1.7.tgz",
+      "resolved": "http://registry.npmjs.org/postcss-merge-idents/-/postcss-merge-idents-2.1.7.tgz",
       "integrity": "sha1-TFUwMTwI4dWzu/PSu8dH4njuonA=",
       "dev": true,
       "requires": {
@@ -10547,7 +10579,7 @@
         },
         "chalk": {
           "version": "1.1.3",
-          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "resolved": "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
           "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
           "dev": true,
           "requires": {
@@ -10560,7 +10592,7 @@
           "dependencies": {
             "supports-color": {
               "version": "2.0.0",
-              "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
+              "resolved": "http://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
               "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
               "dev": true
             }
@@ -10592,7 +10624,7 @@
         },
         "strip-ansi": {
           "version": "3.0.1",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "dev": true,
           "requires": {
@@ -10828,7 +10860,7 @@
     },
     "postcss-reduce-idents": {
       "version": "2.4.0",
-      "resolved": "https://registry.npmjs.org/postcss-reduce-idents/-/postcss-reduce-idents-2.4.0.tgz",
+      "resolved": "http://registry.npmjs.org/postcss-reduce-idents/-/postcss-reduce-idents-2.4.0.tgz",
       "integrity": "sha1-wsbSDMlYKE9qv75j92Cb9AkFmtM=",
       "dev": true,
       "requires": {
@@ -10850,7 +10882,7 @@
         },
         "chalk": {
           "version": "1.1.3",
-          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "resolved": "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
           "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
           "dev": true,
           "requires": {
@@ -10863,7 +10895,7 @@
           "dependencies": {
             "supports-color": {
               "version": "2.0.0",
-              "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
+              "resolved": "http://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
               "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
               "dev": true
             }
@@ -10895,7 +10927,7 @@
         },
         "strip-ansi": {
           "version": "3.0.1",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "dev": true,
           "requires": {
@@ -10979,7 +11011,7 @@
     },
     "postcss-zindex": {
       "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/postcss-zindex/-/postcss-zindex-2.2.0.tgz",
+      "resolved": "http://registry.npmjs.org/postcss-zindex/-/postcss-zindex-2.2.0.tgz",
       "integrity": "sha1-0hCd3AVbka9n/EyzsCWUZjnSryI=",
       "dev": true,
       "requires": {
@@ -11002,7 +11034,7 @@
         },
         "chalk": {
           "version": "1.1.3",
-          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "resolved": "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
           "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
           "dev": true,
           "requires": {
@@ -11015,7 +11047,7 @@
           "dependencies": {
             "supports-color": {
               "version": "2.0.0",
-              "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
+              "resolved": "http://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
               "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
               "dev": true
             }
@@ -11047,7 +11079,7 @@
         },
         "strip-ansi": {
           "version": "3.0.1",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "dev": true,
           "requires": {
@@ -11247,7 +11279,7 @@
       "dependencies": {
         "minimist": {
           "version": "1.2.0",
-          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
           "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
           "dev": true
         }
@@ -11368,6 +11400,18 @@
         "readable-stream": "^2.0.2"
       }
     },
+    "realistic-structured-clone": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/realistic-structured-clone/-/realistic-structured-clone-2.0.2.tgz",
+      "integrity": "sha512-5IEvyfuMJ4tjQOuKKTFNvd+H9GSbE87IcendSBannE28PTrbolgaVg5DdEApRKhtze794iXqVUFKV60GLCNKEg==",
+      "dev": true,
+      "requires": {
+        "core-js": "^2.5.3",
+        "domexception": "^1.0.1",
+        "typeson": "^5.8.2",
+        "typeson-registry": "^1.0.0-alpha.20"
+      }
+    },
     "rechoir": {
       "version": "0.6.2",
       "resolved": "https://registry.npmjs.org/rechoir/-/rechoir-0.6.2.tgz",
@@ -11657,7 +11701,7 @@
     },
     "require-uncached": {
       "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/require-uncached/-/require-uncached-1.0.3.tgz",
+      "resolved": "http://registry.npmjs.org/require-uncached/-/require-uncached-1.0.3.tgz",
       "integrity": "sha1-Tg1W1slmL9MeQwEcS5WqSZVUIdM=",
       "dev": true,
       "requires": {
@@ -11737,7 +11781,7 @@
     },
     "rgba-regex": {
       "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/rgba-regex/-/rgba-regex-1.0.0.tgz",
+      "resolved": "http://registry.npmjs.org/rgba-regex/-/rgba-regex-1.0.0.tgz",
       "integrity": "sha1-QzdOLiyglosO8VI0YLfXMP8i7rM=",
       "dev": true
     },
@@ -12201,7 +12245,7 @@
     },
     "socket.io-parser": {
       "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/socket.io-parser/-/socket.io-parser-3.2.0.tgz",
+      "resolved": "http://registry.npmjs.org/socket.io-parser/-/socket.io-parser-3.2.0.tgz",
       "integrity": "sha512-FYiBx7rc/KORMJlgsXysflWx/RIvtqZbyGLlHZvjfmPTPeuD/I8MaW7cfFrj5tRltICJdgwflhfZ3NVVbVLFQA==",
       "dev": true,
       "requires": {
@@ -12755,6 +12799,15 @@
         "repeat-string": "^1.6.1"
       }
     },
+    "tr46": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-1.0.1.tgz",
+      "integrity": "sha1-qLE/1r/SSJUZZ0zN5VujaTtwbQk=",
+      "dev": true,
+      "requires": {
+        "punycode": "^2.1.0"
+      }
+    },
     "trim-newlines": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/trim-newlines/-/trim-newlines-2.0.0.tgz",
@@ -12816,6 +12869,24 @@
       "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
       "dev": true
     },
+    "typeson": {
+      "version": "5.11.0",
+      "resolved": "https://registry.npmjs.org/typeson/-/typeson-5.11.0.tgz",
+      "integrity": "sha512-S5KtLzcU4dr4BXh8VuJDYugsRGsDQYlumCbrmwuAX1a1GNpbVYK4p9wluCIfTVPFvVyV6wRfExXX6Q1+YDItEQ==",
+      "dev": true
+    },
+    "typeson-registry": {
+      "version": "1.0.0-alpha.26",
+      "resolved": "https://registry.npmjs.org/typeson-registry/-/typeson-registry-1.0.0-alpha.26.tgz",
+      "integrity": "sha512-R0wwXIYSiJMh+1XfvyUsCnEGVERoJcNrMl9e/ka30dJ+gQyh4/0NU9WHaqUm8oHtZzZYCz+A5fDRCiXYIq7H1Q==",
+      "dev": true,
+      "requires": {
+        "base64-arraybuffer-es6": "0.4.2",
+        "typeson": "5.11.0",
+        "uuid": "3.3.2",
+        "whatwg-url": "7.0.0"
+      }
+    },
     "uglify-js": {
       "version": "3.4.9",
       "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.4.9.tgz",
@@ -13230,6 +13301,23 @@
         "defaults": "^1.0.3"
       }
     },
+    "webidl-conversions": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-4.0.2.tgz",
+      "integrity": "sha512-YQ+BmxuTgd6UXZW3+ICGfyqRyHXVlD5GtQr5+qjiNW7bF0cqrzX500HVXPBOvgXb5YnzDd+h0zqyv61KUD7+Sg==",
+      "dev": true
+    },
+    "whatwg-url": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-7.0.0.tgz",
+      "integrity": "sha512-37GeVSIJ3kn1JgKyjiYNmSLP1yzbpb29jdmwBSgkD9h40/hyrR/OifpVUndji3tmwGgD8qpw7iQu3RSbCrBpsQ==",
+      "dev": true,
+      "requires": {
+        "lodash.sortby": "^4.7.0",
+        "tr46": "^1.0.1",
+        "webidl-conversions": "^4.0.2"
+      }
+    },
     "whet.extend": {
       "version": "0.9.9",
       "resolved": "https://registry.npmjs.org/whet.extend/-/whet.extend-0.9.9.tgz",
diff --git a/package.json b/package.json
index 4c21231..3420464 100644
--- a/package.json
+++ b/package.json
@@ -52,6 +52,7 @@
     "chai": "^4.2.0",
     "chai-datetime": "^1.5.0",
     "eslint": "^5.10.0",
+    "fake-indexeddb": "^2.0.4",
     "karma": "^3.1.4",
     "karma-chai": "^0.1.0",
     "karma-chrome-launcher": "^2.2.0",
diff --git a/src/providers/indexeddb.js b/src/providers/indexeddb.js
index db08eb9..b08ab8b 100644
--- a/src/providers/indexeddb.js
+++ b/src/providers/indexeddb.js
@@ -3,11 +3,6 @@ var FILE_STORE_NAME = require('../constants.js').FILE_STORE_NAME;
 var IDB_RW = require('../constants.js').IDB_RW;
 var IDB_RO = require('../constants.js').IDB_RO;
 
-var indexedDB = global.indexedDB       ||
-                global.mozIndexedDB    ||
-                global.webkitIndexedDB ||
-                global.msIndexedDB;
-
 function IndexedDBContext(db, mode) {
   this.db = db;
   this.mode = mode;
@@ -114,6 +109,10 @@ function IndexedDB(name) {
   this.db = null;
 }
 IndexedDB.isSupported = function() {
+  var indexedDB = global.indexedDB       ||
+                  global.mozIndexedDB    ||
+                  global.webkitIndexedDB ||
+                  global.msIndexedDB;
   return !!indexedDB;
 };
 
@@ -126,6 +125,11 @@ IndexedDB.prototype.open = function(callback) {
   }
 
   try {
+    var indexedDB = global.indexedDB       ||
+                    global.mozIndexedDB    ||
+                    global.webkitIndexedDB ||
+                    global.msIndexedDB;
+
     // NOTE: we're not using versioned databases.
     var openRequest = indexedDB.open(that.name);
 
diff --git a/tests/lib/indexeddb.js b/tests/lib/indexeddb.js
index 0fce63b..146a415 100644
--- a/tests/lib/indexeddb.js
+++ b/tests/lib/indexeddb.js
@@ -1,10 +1,5 @@
 var Filer = require('../../src');
 
-var indexedDB = global.indexedDB       ||
-                global.mozIndexedDB    ||
-                global.webkitIndexedDB ||
-                global.msIndexedDB;
-
 var needsCleanup = [];
 if(global.addEventListener) {
   global.addEventListener('beforeunload', function() {
@@ -36,6 +31,11 @@ function IndexedDBTestProvider(name) {
         that.provider.db.close();
       }
 
+      var indexedDB = global.indexedDB       ||
+                      global.mozIndexedDB    ||
+                      global.webkitIndexedDB ||
+                      global.msIndexedDB;
+
       var request = indexedDB.deleteDatabase(name);
       request.onsuccess = finished;
       request.onerror = finished;
diff --git a/tests/lib/test-utils.js b/tests/lib/test-utils.js
index e3c2c81..2c58bb3 100644
--- a/tests/lib/test-utils.js
+++ b/tests/lib/test-utils.js
@@ -43,6 +43,22 @@ function getProviderType() {
   return queryString['filer-provider'] || defaultProvider;
 }
 
+// Run fn() in an environment with indexedDB available
+// either as-is, or shimmed, removing when done.
+function shimIndexedDB(fn) {
+  var addShim = !Filer.FileSystem.providers.IndexedDB.isSupported();
+
+  if(addShim) {
+    global.indexedDB = require('fake-indexeddb');
+  }
+
+  fn();
+
+  if(addShim) {
+    delete global.indexedDB;
+  }
+}
+
 function setup(callback) {
   // In browser we support specifying the provider via the query string
   // (e.g., ?filer-provider=IndexedDB). If not specified, we use
@@ -153,5 +169,6 @@ module.exports = {
   },
   cleanup: cleanup,
   typedArrayEqual: typedArrayEqual,
-  parseBJSON
+  parseBJSON,
+  shimIndexedDB
 };
diff --git a/tests/spec/filer.spec.js b/tests/spec/filer.spec.js
index 18cb8d8..b8c8b10 100644
--- a/tests/spec/filer.spec.js
+++ b/tests/spec/filer.spec.js
@@ -1,4 +1,5 @@
 var Filer = require('../../src');
+var util = require('../lib/test-utils');
 var expect = require('chai').expect;
 
 describe('Filer', function() {
@@ -26,19 +27,17 @@ describe('Filer', function() {
 
   it('has an fs object that returns a Filer.FileSystem', function() {
     // Depends on IndexedDB being available, since we can't
-    // configure our own test provider.
-    if(!Filer.FileSystem.providers.IndexedDB.isSupported()) {
-      this.skip();
-    }
+    // configure our own test provider.  Shim for coverage.
+    util.shimIndexedDB(function() {
+      expect(typeof Filer.fs).to.equal('object');
 
-    expect(typeof Filer.fs).to.equal('object');
-
-    const fs1 = Filer.fs;
-    const fs2 = Filer.fs;
-
-    expect(fs1).to.be.an.instanceof(Filer.FileSystem);
-    expect(fs2).to.be.an.instanceof(Filer.FileSystem);
-    expect(fs1).to.equal(fs2);
+      const fs1 = Filer.fs;
+      const fs2 = Filer.fs;
+  
+      expect(fs1).to.be.an.instanceof(Filer.FileSystem);
+      expect(fs2).to.be.an.instanceof(Filer.FileSystem);
+      expect(fs1).to.equal(fs2);  
+    });
   });
 
   it('has Shell constructor', function() {