1 files changed, 20 insertions, 0 deletions
diff --git a/test/excelx/cell/test_string.rb b/test/excelx/cell/test_string.rb
index f1c848f..b7ecaa7 100644
--- a/test/excelx/cell/test_string.rb
+++ b/test/excelx/cell/test_string.rb
@@ -25,4 +25,24 @@ class TestRooExcelxCellString < Minitest::Test
     cell = string.new '0', nil, nil, nil, nil
     assert_equal '0', cell.value
   end
+
+  def test_not_empty?
+    cell = string.new '1', nil, nil, nil, nil
+    assert_equal false, cell.empty?
+  end
+
+  def test_empty?
+    cell = string.new '', nil, nil, nil, nil
+    assert_equal true, cell.empty?
+  end
+
+  def test_presence
+    cell = string.new '1', nil, nil, nil, nil
+    assert_equal cell, cell.presence
+  end
+
+  def test_nil_presence
+    cell = string.new '', nil, nil, nil, nil
+    assert_nil cell.presence
+  end
 end