Add mock fs and tests for it

1 files changed, 101 insertions, 0 deletions

diff --git a/lib/fs/mock.js b/lib/fs/mock.js
new file mode 100644
index 0000000..6c2670b
--- /dev/null
+++ b/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;