made plot div output more meaningful for downstream web content

tests/test_frame.py

@@ -1189,19 +1189,29 @@ def test_plot_series_filefolders(self: TestOpenFrame) -> None:
             msg = "html file not created"
             raise FileNotFoundError(msg)
 
+        plotfile.unlink()
+        if plotfile.exists():
+            msg = "html file not deleted as intended"
+            raise FileExistsError(msg)
+
         if figfile[:5] == "<div>":
             msg = "plot_series method not working as intended"
             raise FileNotFoundError(msg)
 
-        _, divstring = plotframe.plot_series(auto_open=False, output_type="div")
+        filename = "trial.html"
+        divfile = directory.joinpath(filename)
+        _, divstring = plotframe.plot_series(
+            auto_open=False,
+            output_type="div",
+            filename=filename,
+            directory=directory,
+        )
+
         if divstring[:5] != "<div>" or divstring[-6:] != "</div>":
             msg = "Html div section not created"
             raise FileNotFoundError(msg)
 
-        plotfile.unlink()
-        if plotfile.exists():
-            msg = "html file not deleted as intended"
-            raise FileExistsError(msg)
+        divfile.unlink()
 
         with patch("pathlib.Path.exists") as mock_userfolderexists:
             mock_userfolderexists.return_value = True
@@ -1305,19 +1315,29 @@ def test_plot_bars_filefolders(self: TestOpenFrame) -> None:
             msg = "html file not created"
             raise FileNotFoundError(msg)
 
+        plotfile.unlink()
+        if plotfile.exists():
+            msg = "html file not deleted as intended"
+            raise FileExistsError(msg)
+
         if figfile[:5] == "<div>":
             msg = "plot_bars method not working as intended"
             raise FileNotFoundError(msg)
 
-        _, divstring = plotframe.plot_bars(auto_open=False, output_type="div")
+        filename = "trial.html"
+        divfile = directory.joinpath(filename)
+        _, divstring = plotframe.plot_bars(
+            auto_open=False,
+            output_type="div",
+            filename=filename,
+            directory=directory,
+        )
+
         if divstring[:5] != "<div>" or divstring[-6:] != "</div>":
             msg = "Html div section not created"
             raise FileNotFoundError(msg)
 
-        plotfile.unlink()
-        if plotfile.exists():
-            msg = "html file not deleted as intended"
-            raise FileExistsError(msg)
+        divfile.unlink()
 
         with patch("pathlib.Path.exists") as mock_userfolderexists:
             mock_userfolderexists.return_value = True