Add File::lstat, #lstat. Report the correct size for symlinks when us…

…ing lstat. Closes Github fakefs#25

lib/fakefs/file.rb

@@ -172,13 +172,18 @@ def self.stat(file)
       File::Stat.new(file)
     end
 
+    def self.lstat(file)
+      File::Stat.new(file, true)
+    end
+
     class Stat
-      def initialize(file)
+      def initialize(file, __lstat = false)
         if !File.exists?(file)
           raise(Errno::ENOENT, "No such file or directory - #{file}")
         end
 
-        @file = file
+        @file    = file
+        @__lstat = __lstat
       end
 
       def symlink?
@@ -194,7 +199,11 @@ def nlink
       end
 
       def size
-        File.size(@file)
+        if @__lstat && symlink?
+          FileSystem.find(@file).target.size
+        else
+          File.size(@file)
+        end
       end
     end
 
@@ -236,7 +245,11 @@ def read_nonblock(maxlen, outbuf = nil)
     end
 
     def stat
-      raise NotImplementedError
+      self.class.stat(@path)
+    end
+
+    def lstat
+      self.class.lstat(@path)
     end
 
     def sysseek(position, whence = SEEK_SET)
@@ -278,10 +291,6 @@ def flock(locking_constant)
       raise NotImplementedError
     end
 
-    def lstat
-      raise NotImplementedError
-    end
-
     def mtime
       raise NotImplementedError
     end

test/fake/file/lstat_test.rb

@@ -0,0 +1,59 @@
+require "test_helper"
+
+class FileStat < Test::Unit::TestCase
+  def setup
+    FakeFS.activate!
+    FakeFS::FileSystem.clear
+  end
+
+  def teardown
+    FakeFS.deactivate!
+  end
+
+  def test_calling_lstat_should_create_a_new_file_stat_object
+    File.open("foo", "w") do |f|
+      f << "bar"
+    end
+
+    File.open("foo") do |f|
+      assert_equal File::Stat, f.lstat.class
+    end
+  end
+
+  def test_lstat_should_use_correct_file
+    File.open("bar", "w") do |f|
+      f << "1"
+    end
+
+    File.open("bar") do |f|
+      assert_equal 1, f.lstat.size
+    end
+  end
+
+  def test_lstat_should_report_on_symlink_itself
+    File.open("foo", "w") { |f| f << "some content" }
+    File.symlink "foo", "my_symlink"
+
+    assert_not_equal File.lstat("my_symlink").size, File.lstat("foo").size
+  end
+
+  def test_should_report_on_symlink_itself_with_size_instance_method
+    File.open("foo", "w") { |f| f << "some content" }
+    File.symlink "foo", "my_symlink"
+
+    file = File.open("foo")
+    symlink = File.open("my_symlink")
+
+    assert_not_equal file.lstat.size, symlink.lstat.size
+  end
+
+  def test_symlink_size_is_size_of_path_pointed_to
+    File.open("a", "w") { |x| x << "foobarbazfoobarbaz" }
+    File.symlink "a", "one_char_symlink"
+    assert_equal 1, File.lstat("one_char_symlink").size
+
+    File.open("ab", "w") { |x| x << "foobarbazfoobarbaz" }
+    File.symlink "ab", "two_char_symlink"
+    assert_equal 2, File.lstat("two_char_symlink").size
+  end
+end

test/fake/file/stat_test.rb

@@ -0,0 +1,39 @@
+require "test_helper"
+
+class FileStat < Test::Unit::TestCase
+  def setup
+    FakeFS.activate!
+    FakeFS::FileSystem.clear
+  end
+
+  def teardown
+    FakeFS.deactivate!
+  end
+
+  def test_calling_stat_should_create_a_new_file_stat_object
+    File.open("foo", "w") do |f|
+      f << "bar"
+    end
+
+    File.open("foo") do |f|
+      assert_equal File::Stat, f.stat.class
+    end
+  end
+
+  def test_stat_should_use_correct_file
+    File.open("bar", "w") do |f|
+      f << "1"
+    end
+
+    File.open("bar") do |f|
+      assert_equal 1, f.stat.size
+    end
+  end
+
+  def test_stat_should_report_on_symlink_pointer
+    File.open("foo", "w") { |f| f << "some content" }
+    File.symlink "foo", "my_symlink"
+
+    assert_equal File.stat("my_symlink").size, File.stat("foo").size
+  end
+end