Add mock fs and tests for it

.eslintrc

@@ -14,7 +14,8 @@
         "node": true,
         "mocha": true,
         "browser": true,
-        "jest": true
+        "jest": true,
+        "jasmine": true
     },
     "extends": "eslint:recommended"
 }

lib/fs/__tests__/mock.js

@@ -0,0 +1,83 @@
+jest.autoMockOff();
+
+describe('MockFS', function() {
+    var createMockFS = require('../mock');
+    var fs = createMockFS({
+        'README.md': 'Hello World',
+        'SUMMARY.md': '# Summary',
+        'folder': {
+            'test.md': 'Cool',
+            'folder2': {
+                'hello.md': 'Hello',
+                'world.md': 'World'
+            }
+        }
+    });
+
+    describe('exists', function() {
+        pit('must return true for a file', function() {
+            return fs.exists('README.md')
+            .then(function(result) {
+                expect(result).toBeTruthy();
+            });
+        });
+
+        pit('must return false for a non existing file', function() {
+            return fs.exists('README_NOTEXISTS.md')
+            .then(function(result) {
+                expect(result).toBeFalsy();
+            });
+        });
+
+        pit('must return true for a directory', function() {
+            return fs.exists('folder')
+            .then(function(result) {
+                expect(result).toBeTruthy();
+            });
+        });
+
+        pit('must return true for a deep file', function() {
+            return fs.exists('folder/test.md')
+            .then(function(result) {
+                expect(result).toBeTruthy();
+            });
+        });
+
+        pit('must return true for a deep file (2)', function() {
+            return fs.exists('folder/folder2/hello.md')
+            .then(function(result) {
+                expect(result).toBeTruthy();
+            });
+        });
+    });
+
+    describe('readAsString', function() {
+        pit('must return content for a file', function() {
+            return fs.readAsString('README.md')
+            .then(function(result) {
+                expect(result).toBe('Hello World');
+            });
+        });
+
+        pit('must return content for a deep file', function() {
+            return fs.readAsString('folder/test.md')
+            .then(function(result) {
+                expect(result).toBe('Cool');
+            });
+        });
+    });
+
+    describe('readDir', function() {
+        pit('must return content for a directory', function() {
+            return fs.readDir('./')
+            .then(function(files) {
+                expect(files.size).toBe(3);
+                expect(files.includes('README.md')).toBeTruthy();
+                expect(files.includes('SUMMARY.md')).toBeTruthy();
+                expect(files.includes('folder/')).toBeTruthy();
+            });
+        });
+    });
+});
+
+

lib/fs/mock.js

@@ -0,0 +1,101 @@
+var path = require('path');
+var is = require('is');
+var Buffer = require('buffer').Buffer;
+var Immutable = require('immutable');
+
+var FS = require('../models/fs');
+var error = require('../utils/error');
+
+/**
+    Create a fake filesystem for testing books
+
+    @param {Map<String:File>}
+*/
+function createMockFS(files) {
+    files = Immutable.fromJS(files);
+    var mtime = new Date();
+
+    /**
+        Get a file by resolving its path
+
+        @param {String}
+        @return {String|Map|null}
+    */
+    function getFile(filePath) {
+        var parts = path.normalize(filePath).split('/');
+        return parts.reduce(function(list, part, i) {
+            if (!list) return null;
+
+            var file;
+
+            if (!part || part === '.') file = list;
+            else file = list.get(part);
+
+            if (!file) return null;
+
+            if (is.string(file)) {
+                if (i === (parts.length - 1)) return file;
+                else return null;
+            }
+
+            return file;
+        }, files);
+    }
+
+    function fsExists(filePath) {
+        return Boolean(getFile(filePath) !== null);
+    }
+
+    function fsReadFile(filePath) {
+        var file = getFile(filePath);
+        if (!is.string(file)) {
+            throw error.FileNotFoundError({
+                filename: filePath
+            });
+        }
+
+        return new Buffer(file, 'utf8');
+    }
+
+    function fsStatFile(filePath) {
+        var file = getFile(filePath);
+        if (!file) {
+            throw error.FileNotFoundError({
+                filename: filePath
+            });
+        }
+
+        return {
+            mtime: mtime
+        };
+    }
+
+    function fsReadDir(filePath) {
+        var dir = getFile(filePath);
+        if (!dir || is.string(dir)) {
+            throw error.FileNotFoundError({
+                filename: filePath
+            });
+        }
+
+        return dir
+            .map(function(content, name) {
+                if (!is.string(content)) {
+                    name = name + '/';
+                }
+
+                return name;
+            })
+            .valueSeq();
+    }
+
+    return FS.create({
+        root: '',
+        fsExists: fsExists,
+        fsReadFile: fsReadFile,
+        fsStatFile: fsStatFile,
+        fsReadDir: fsReadDir
+    });
+}
+
+module.exports = createMockFS;

lib/models/fs.js

@@ -46,7 +46,8 @@ FS.prototype.isInScope = function(filename) {
 FS.prototype.resolve = function() {
     var rootPath = this.getRoot();
     var args = Array.prototype.slice.call(arguments);
-    var filename = path.resolve.apply(path, [rootPath].concat(args));
+    var filename = path.join.apply(path, [rootPath].concat(args));
+    filename = path.normalize(filename);
 
     if (!this.isInScope(filename)) {
         throw error.FileOutOfScopeError({

lib/plugins/__tests__/findInstalled.js

@@ -1,4 +1,5 @@
 jest.autoMockOff();
+jasmine.DEFAULT_TIMEOUT_INTERVAL = 10000;
 
 var path = require('path');