1 files changed, 76 insertions, 0 deletions
diff --git a/spec/ruby/shared/file/zero.rb b/spec/ruby/shared/file/zero.rb
new file mode 100644
index 0000000000..bb5eea57ad
--- /dev/null
+++ b/spec/ruby/shared/file/zero.rb
@@ -0,0 +1,76 @@
+describe :file_zero, shared: true do
+  before :each do
+    @zero_file    = tmp("test.txt")
+    @nonzero_file = tmp("test2.txt")
+    @dir = tmp("dir")
+
+    Dir.mkdir @dir
+    touch @zero_file
+    touch(@nonzero_file) { |f| f.puts "hello" }
+  end
+
+  after :each do
+    rm_r @zero_file, @nonzero_file
+    rm_r @dir
+  end
+
+  it "returns true if the file is empty" do
+    @object.send(@method, @zero_file).should == true
+  end
+
+  it "returns false if the file is not empty" do
+    @object.send(@method, @nonzero_file).should == false
+  end
+
+  it "accepts an object that has a #to_path method" do
+    @object.send(@method, mock_to_path(@zero_file)).should == true
+  end
+
+  platform_is :windows do
+    it "returns true for NUL" do
+      @object.send(@method, 'NUL').should == true
+      @object.send(@method, 'nul').should == true
+    end
+  end
+
+  platform_is_not :windows do
+    it "returns true for /dev/null" do
+      @object.send(@method, File.realpath('/dev/null')).should == true
+    end
+  end
+
+  it "raises an ArgumentError if not passed one argument" do
+    lambda { File.zero? }.should raise_error(ArgumentError)
+  end
+
+  it "raises a TypeError if not passed a String type" do
+    lambda { @object.send(@method, nil)   }.should raise_error(TypeError)
+    lambda { @object.send(@method, true)  }.should raise_error(TypeError)
+    lambda { @object.send(@method, false) }.should raise_error(TypeError)
+  end
+
+  it "returns true inside a block opening a file if it is empty" do
+    File.open(@zero_file,'w') do
+      @object.send(@method, @zero_file).should == true
+    end
+  end
+
+  platform_is_not :windows do
+    it "returns false for a directory" do
+      @object.send(@method, @dir).should == false
+    end
+  end
+
+  platform_is :windows do
+    # see http://redmine.ruby-lang.org/issues/show/449 for background
+    it "returns true for a directory" do
+      @object.send(@method, @dir).should == true
+    end
+  end
+end
+
+describe :file_zero_missing, shared: true do
+  it "returns false if the file does not exist" do
+    @object.send(@method, 'fake_file').should == false
+  end
+end