Implemented File.ctime, File.stat(file).ctime, File.open(file){|f| f.ctime }, File.mtime, File.stat(file).mtime and File.open(file){|f| f.mtime }

lib/fakefs/fake/dir.rb

@@ -1,10 +1,13 @@
 module FakeFS
   class FakeDir < Hash
     attr_accessor :name, :parent
+    attr_reader :ctime, :mtime
 
     def initialize(name = nil, parent = nil)
       @name   = name
       @parent = parent
+      @ctime  = Time.now
+      @mtime  = @ctime
     end
 
     def entry

lib/fakefs/fake/file.rb

@@ -1,6 +1,7 @@
 module FakeFS
   class FakeFile
-    attr_accessor :name, :parent, :content, :mtime
+    attr_accessor :name, :parent, :content
+    attr_reader :ctime, :mtime
 
     class Inode
       def initialize(file_owner)
@@ -31,7 +32,8 @@ module FakeFS
       @name   = name
       @parent = parent
       @inode  = Inode.new(self)
-      @mtime  = Time.now
+      @ctime  = Time.now
+      @mtime  = @ctime
     end
 
     attr_accessor :inode

lib/fakefs/file.rb

@@ -56,6 +56,14 @@ module FakeFS
       end
     end
 
+    def self.ctime(path)
+      if exists?(path)
+        FileSystem.find(path).ctime
+      else
+        raise Errno::ENOENT
+      end
+    end
+
     def self.size(path)
       read(path).length
     end
@@ -179,13 +187,17 @@ module FakeFS
     end
 
     class Stat
+      attr_reader :ctime, :mtime
+
       def initialize(file, __lstat = false)
         if !File.exists?(file)
           raise(Errno::ENOENT, "No such file or directory - #{file}")
         end
 
         @file      = file
+        @fake_file = FileSystem.find(@file)
         @__lstat   = __lstat
+        @ctime, @mtime = @fake_file.ctime, @fake_file.mtime
       end
 
       def symlink?
@@ -197,12 +209,12 @@ module FakeFS
       end
 
       def nlink
-        FileSystem.find(@file).links.size
+        @fake_file.links.size
       end
 
       def size
         if @__lstat && symlink?
-          FileSystem.find(@file).target.size
+          @fake_file.target.size
         else
           File.size(@file)
         end
@@ -286,7 +298,7 @@ module FakeFS
     end
 
     def ctime
-      raise NotImplementedError
+      self.class.ctime(@path)
     end
 
     def flock(locking_constant)
@@ -294,7 +306,7 @@ module FakeFS
     end
 
     def mtime
-      raise NotImplementedError
+      self.class.mtime(@path)
     end
 
     if RUBY_VERSION.to_f >= 1.9

test/fakefs_test.rb

@@ -330,6 +330,60 @@ class FakeFSTest < Test::Unit::TestCase
     assert File.mtime('/path/to/file.txt').is_a?(Time)
   end
 
+  def test_raises_error_on_ctime_if_file_does_not_exist
+    assert_raise Errno::ENOENT do
+      File.ctime('/path/to/file.txt')
+    end
+  end
+
+  def test_can_return_ctime_on_existing_file
+    File.open("foo", "w") { |f| f << "some content" }
+    assert File.ctime('foo').is_a?(Time)
+  end
+
+  def test_ctime_and_mtime_are_equal_for_new_files
+    File.open("foo", "w") { |f| f << "some content" }
+    ctime = File.ctime("foo")
+    mtime = File.mtime("foo")
+    assert ctime.is_a?(Time)
+    assert mtime.is_a?(Time)
+    assert_equal ctime, mtime
+
+    File.open("foo", "r") do |f|
+      assert_equal ctime, f.ctime
+      assert_equal mtime, f.mtime
+    end
+  end
+
+  def test_ctime_and_mtime_are_equal_for_new_directories
+    FileUtils.mkdir_p("foo")
+    ctime = File.ctime("foo")
+    mtime = File.mtime("foo")
+    assert ctime.is_a?(Time)
+    assert mtime.is_a?(Time)
+    assert_equal ctime, mtime
+  end
+
+  def test_file_ctime_is_equal_to_file_stat_ctime
+    File.open("foo", "w") { |f| f << "some content" }
+    assert_equal File.stat("foo").ctime, File.ctime("foo")
+  end
+
+  def test_directory_ctime_is_equal_to_directory_stat_ctime
+    FileUtils.mkdir_p("foo")
+    assert_equal File.stat("foo").ctime, File.ctime("foo")
+  end
+
+  def test_file_mtime_is_equal_to_file_stat_mtime
+    File.open("foo", "w") { |f| f << "some content" }
+    assert_equal File.stat("foo").mtime, File.mtime("foo")
+  end
+
+  def test_directory_mtime_is_equal_to_directory_stat_mtime
+    FileUtils.mkdir_p("foo")
+    assert_equal File.stat("foo").mtime, File.mtime("foo")
+  end
+
   def test_can_read_with_File_readlines
     path = '/path/to/file.txt'
     File.open(path, 'w') do |f|