Issue 4223 - Adapt filter storage read/write tests to work in adblockpluscore repository

test/stub-modules/io.js

+let data = {};
+
 //
 // Fake nsIFile implementation for our I/O
 //
 function FakeFile(path)
 {
   this.path = path;
 }
 FakeFile.prototype =
 {
   get leafName()
   {
     return this.path;
   },
   set leafName(value)
   {
     this.path = value;
   },
   append: function(path)
   {
     this.path += path;
   },
+  exists: function()
+  {
+    return this.path in data;
+  },
+  get contents()
+  {
+    return (data[this.path] || {}).contents;
+  },
+  set contents(value)
+  {
+    data[this.path] = {lastModified: Date.now()};
+    return data[this.path].contents = value;
+  },
+  get lastModifiedTime()
+  {
+    return (data[this.path] || {}).lastModified;
+  },
+  set lastModifiedTime(value)
+  {
+    return (data[this.path] || {}).lastModified = value;
+  },
   clone: function()
   {
     return new FakeFile(this.path);
   },
   get parent()
   {
     return {create: function() {}};
   },
   normalize: function() {}
 };
 
-
 exports.IO = {
+  lineBreak: "\n",
   resolveFilePath: function(path)
   {
     return new FakeFile(path);
   },
-  statFile: function(path)
+  writeToFile: function(file, generator, callback)
   {
-    return true;
-  }
+    Promise.resolve().then(() =>
+    {
+      let data = [];
+      for (let line of generator)
+        data.push(line);
+      file.contents = data.join("\n") + "\n";
+    }).then(() => callback(null)).catch(e => callback(e));
+  },
+  readFromFile: function(file, listener, callback)
+  {
+    Promise.resolve().then(() =>
+    {
+      if (!data.hasOwnProperty(file.path))
+        throw new Error("File doesn't exist");
+
+      let lines = file.contents.split("\n");
+      if (lines.length && lines[lines.length - 1] == "")
+        lines.pop();
+      for (let line of lines)
+        listener.process(line);
+      listener.process(null);
+    }).then(() => callback(null)).catch(e => callback(e));
+  },
+  copyFile: function(from, to, callback)
+  {
+    Promise.resolve().then(() =>
+    {
+      if (!data.hasOwnProperty(from.path))
+        throw new Error("File doesn't exist");
+      if (from.path == to.path)
+        throw new Error("Cannot copy file to itself");
+
+      to.contents = from.contents;
+    }).then(() => callback(null)).catch(e => callback(e));
+  },
+  renameFile: function(from, newName, callback)
+  {
+    Promise.resolve().then(() =>
+    {
+      if (!data.hasOwnProperty(from.path))
+        throw new Error("File doesn't exist");
+      if (from.path == newName)
+        throw new Error("Cannot move file to itself");
+
+      data[newName] = data[from.path];
+      delete data[from.path];
+    }).then(() => callback(null)).catch(e => callback(e));
+  },
+  removeFile: function(file, callback)
+  {
+    Promise.resolve().then(() =>
+    {
+      if (!data.hasOwnProperty(file.path))
+        throw new Error("File doesn't exist");
+
+      delete data[file.path];
+    }).then(() => callback(null)).catch(e => callback(e));
+  },
+  statFile: function(file, callback)
+  {
+    Promise.resolve().then(() =>
+    {
+      if (file.exists())
+      {
+        return {
+          exists: true,
+          isDirectory: false,
+          isFile: true,
+          lastModified: file.lastModifiedTime
+        };
+      }
+      else
+      {
+        return {
+          exists: false,
+          isDirectory: false,
+          isFile: false,
+          lastModified: 0
+        };
+      }
+    }).then(result => callback(null, result)).catch(e => callback(e));
+  },
 };