fixed ioIndexedDB tests

qunit/tests/ioIndexedDB.js

 "use strict";
 
 {
   const {IO} = require("io");
   const info = require("info");
 
   const testFileNames = {
     testData: "testData",
     simpleCheck: "simpleCheck",
     write: "writeCheck",
     read: "readCheck",
     rename: "renameCheck"
   };
   const testData = {
     fileName: "file:" + testFileNames.testData,
     content: [1, 2, 3],
     lastModified: Date.now()
   };
 
   let testEdge = info.platform == "edgehtml" ? QUnit.test : QUnit.skip;
 
-  QUnit.module("Edge filter storage", {
+  QUnit.module("Microsoft Edge filter storage", {
     beforeEach()
     {
       return prePopulateStorage();
     },
     afterEach()
     {
       return clearStorage();
     }
   });
 
-  function prePopulateStorage()
-  {
-    return new Promise(resolve =>
-    {
-      let db;
-      let req = indexedDB.open("adblockplus", 1);
-
-      req.onsuccess = event =>
-      {
-        db = event.currentTarget.result;
-        let store = db
-          .transaction(["file"], "readwrite")
-          .objectStore("file");
-
-        store.put(testData).onsuccess = () => resolve();
-      };
-    });
-  }
-
-  function clearStorage()
-  {
-    return new Promise(resolve =>
-    {
-      let db;
-      let req = indexedDB.open("adblockplus", 1);
-
-      req.onsuccess = event =>
-      {
-        db = event.currentTarget.result;
-        let files = Object.values(testFileNames)
-          .map(fileName => new Promise((resolveFile, reject) =>
-          {
-            let store = db
-              .transaction(["file"], "readwrite")
-              .objectStore("file");
-
-            store.delete("file:" + fileName).onsuccess = resolveFile;
-          }));
-
-        Promise.all(files).then(resolve);
-      };
-    });
-  }
-
-  testEdge("statFile", assert => testStatFile(assert));
-  testEdge("readFromFile", assert => testReadFromFile(assert));
-  testEdge("writeToFile", assert => testWriteToFile(assert));
-  testEdge("renameFile", assert => testRenameFile(assert));
-
-  function testStatFile(assert)
+  testEdge("statFile", assert =>
   {
     const noFileMsg = "returns correct value if file doesn't exist";
     const fileExistsMsg = "returns correct value if file exists";
 
     ok(IO.statFile(testFileNames.simpleCheck) instanceof Promise,
-        "returns a promise");
+      "returns a promise");
 
     asyncReadHelper(
-        IO.statFile,
-        testFileNames.testData,
-        {exists: true, lastModified: testData.lastModified},
-        fileExistsMsg,
-        assert);
+      IO.statFile,
+      testFileNames.testData,
+      {exists: true, lastModified: testData.lastModified},
+      fileExistsMsg,
+      assert);
 
     asyncReadHelper(
-        IO.statFile,
-        testFileNames.simpleCheck,
-        {exists: false},
-        noFileMsg,
-        assert);
-  }
-
-  function testReadFromFile(assert)
+      IO.statFile,
+      testFileNames.simpleCheck,
+      {exists: false},
+      noFileMsg,
+      assert);
+  });
+
+  testEdge("writeToFile", assert =>
+  {
+    ok(IO.writeToFile(testFileNames.simpleCheck, ["test"]) instanceof Promise,
+      "returns a promise");
+
+    writesCorrectValue(assert);
+  });
+
+  function writesCorrectValue(assert)
+  {
+    const writeCheck = {
+      fileName: "file:writeCheck",
+      content: [1, 2, 3],
+      lastModified: Date.now()
+    };
+    let done = assert.async();
+
+    IO.writeToFile(testFileNames.write, writeCheck.content)
+      .then(() => readFromStorage(writeCheck.fileName))
+      .then(result =>
+      {
+        deepEqual(
+          Object.keys(writeCheck),
+          Object.keys(result),
+          "data is written in the correct format");
+
+        deepEqual(
+          writeCheck.content,
+          result.content,
+          "data has the correct content");
+        done();
+      });
+  }
+
+  testEdge("readFromFile", assert =>
   {
     const noFileMsg = "returns correct value if file doesn't exist";
 
     ok(IO.readFromFile(testFileNames.simpleCheck) instanceof Promise,
     "returns a promise");
 
     asyncReadHelper(
       IO.readFromFile,
       testFileNames.read,
       {type: "NoSuchFile"},
       noFileMsg,
       assert
     );
 
     callsListeners(assert);
-  }
-
-  function asyncReadHelper(method, fileName, expectedValue, description, assert)
-  {
-    let done = assert.async();
-
-    method(fileName)
-    .then(result =>
-    {
-      deepEqual(result, expectedValue, description);
-      done();
-    })
-    .catch(error =>
-    {
-      deepEqual(error, expectedValue, description);
-      done();
-    });
-  }
+  });
 
   function callsListeners(assert)
   {
     let done = assert.async();
     let called = [];
 
-    IO.readFromFile(testFileNames.testData, entry => called.push(entry))
+    IO.readFromFile(testFileNames.testData, (entry) => called.push(entry))
       .then(() =>
       {
         deepEqual(
           called,
           testData.content,
           "calls listeners with the correct values");
         done();
       });
   }
 
-  function testWriteToFile(assert)
-  {
-    ok(IO.writeToFile(testFileNames.simpleCheck, ["test"]) instanceof Promise,
-    "returns a promise");
-
-    writesCorrectValue(assert);
-  }
-
-  function writesCorrectValue(assert)
-  {
-    const writeCheck = {
-      fileName: "file:writeCheck",
-      content: [1, 2, 3],
-      lastModified: Date.now()
-    };
-    let done = assert.async();
-
-    IO.writeToFile(testFileNames.write, writeCheck.content)
-      .then(() => readFromStorage(writeCheck.fileName))
-      .then(result =>
-      {
-        deepEqual(
-          Object.keys(writeCheck),
-          Object.keys(result),
-          "data is written in the correct format");
-
-        deepEqual(
-          writeCheck.content,
-          result.content,
-          "data has the correct content");
-        done();
-      });
-  }
-
-  function testRenameFile(assert)
+  testEdge("renameFile", assert =>
   {
     ok(IO.renameFile(testFileNames.simpleCheck) instanceof Promise,
-    "returns a promise");
+      "returns a promise");
 
     checkRename(assert);
-  }
+  });
 
   function checkRename(assert)
   {
     let done = assert.async();
     const expected = {
       fileName: "file:" + testFileNames.rename,
       content: testData.content,
       lastModified: testData.lastModified
     };
 
     IO.renameFile(testFileNames.testData, testFileNames.rename)
       .then(() => readFromStorage("file:" + testFileNames.rename))
       .then(result =>
       {
         deepEqual(result, expected, "overrites file");
         done();
       });
   }
 
+  function asyncReadHelper(method, fileName, expectedValue, description, assert)
+  {
+    let done = assert.async();
+    method(fileName)
+    .then(result =>
+    {
+      deepEqual(result, expectedValue, description);
+      done();
+    })
+    .catch(error =>
+    {
+      deepEqual(error, expectedValue, description);
+      done();
+    });
+  }
+
   function readFromStorage(fileName)
   {
     return new Promise(resolve =>
     {
       let db;
       let req = indexedDB.open("adblockplus", 1);
-      req.onsuccess = event =>
+      req.onsuccess = (event) =>
       {
         db = event.currentTarget.result;
         let store = db
           .transaction(["file"], "readwrite")
           .objectStore("file");
 
         store.get(fileName).onsuccess = (evt =>
           resolve(evt.currentTarget.result)
         );
       };
     });
   }
+
+  function prePopulateStorage()
+  {
+    return new Promise(resolve =>
+    {
+      let db;
+      let req = indexedDB.open("adblockplus", 1);
+
+      req.onsuccess = (event) =>
+      {
+        db = event.currentTarget.result;
+        let store = db
+          .transaction(["file"], "readwrite")
+          .objectStore("file");
+
+        store.put(testData).onsuccess = resolve;
+      };
+    });
+  }
+
+  function clearStorage()
+  {
+    return new Promise(resolve =>
+      {
+      let db;
+      let req = indexedDB.open("adblockplus", 1);
+
+      req.onsuccess = (event) =>
+      {
+        db = event.currentTarget.result;
+        let files = Object.keys(testFileNames)
+          .map(fileName => new Promise((resolveFile, reject) =>
+          {
+            let store = db
+              .transaction(["file"], "readwrite")
+              .objectStore("file");
+
+            store.delete("file:" + fileName).onsuccess = resolveFile;
+          }));
+
+        Promise.all(files).then(resolve);
+      };
+    });
+  }
 }
+