3 files changed, 28 insertions, 0 deletions
diff --git a/test/drawing/tc_axes.rb b/test/drawing/tc_axes.rb
new file mode 100644
index 00000000..e3c26936
--- /dev/null
+++ b/test/drawing/tc_axes.rb
@@ -0,0 +1,8 @@
+require 'tc_helper.rb'
+
+class TestAxes < Test::Unit::TestCase
+  def test_constructor_requires_cat_axis_first
+    assert_raise(ArgumentError) { Axlsx::Axes.new(:val_axis => Axlsx::ValAxis, :cat_axis => Axlsx::CatAxis) }
+    assert_nothing_raised { Axlsx::Axes.new(:cat_axis => Axlsx::CatAxis, :val_axis => Axlsx::ValAxis) }
+  end
+end
+\ No newline at end of file
diff --git a/test/drawing/tc_bar_3D_chart.rb b/test/drawing/tc_bar_3D_chart.rb
index 3e1ff342..0cae7af6 100644
--- a/test/drawing/tc_bar_3D_chart.rb
+++ b/test/drawing/tc_bar_3D_chart.rb
@@ -62,4 +62,10 @@ class TestBar3DChart < Test::Unit::TestCase
     assert(errors.empty?, "error free validation")
   end
 
+  def test_to_xml_string_has_axes_in_correct_order
+    str = @chart.to_xml_string
+    cat_axis_position = str.index(@chart.axes[:cat_axis].id.to_s)
+    val_axis_position = str.index(@chart.axes[:val_axis].id.to_s)
+    assert(cat_axis_position < val_axis_position, "cat_axis must occur earlier than val_axis in the XML")
+  end
 end
diff --git a/test/drawing/tc_chart.rb b/test/drawing/tc_chart.rb
index 03e4fd6f..751d2ae4 100644
--- a/test/drawing/tc_chart.rb
+++ b/test/drawing/tc_chart.rb
@@ -45,6 +45,14 @@ class TestChart < Test::Unit::TestCase
     assert_equal(false, @chart.vary_colors)
   end
 
+  def test_display_blanks_as
+    assert_equal(:gap, @chart.display_blanks_as, "default is not :gap")
+    assert_raise(ArgumentError, "did not validate possible values") { @chart.display_blanks_as = :hole }
+    assert_nothing_raised { @chart.display_blanks_as = :zero }
+    assert_nothing_raised { @chart.display_blanks_as = :span }
+    assert_equal(:span, @chart.display_blanks_as)
+  end
+
   def test_start_at
     @chart.start_at 15, 25
     assert_equal(@chart.graphic_frame.anchor.from.col, 15)
@@ -94,4 +102,10 @@ class TestChart < Test::Unit::TestCase
     assert(errors.empty?, "error free validation")
   end
 
+  def test_to_xml_string_for_display_blanks_as
+    schema = Nokogiri::XML::Schema(File.open(Axlsx::DRAWING_XSD))
+    @chart.display_blanks_as = :span
+    doc = Nokogiri::XML(@chart.to_xml_string)
+    assert_equal("span", doc.xpath("//c:dispBlanksAs").attr("val").value, "did not use the display_blanks_as configuration")
+  end
 end