diff --git a/.gitignore b/.gitignore
index 3af70316b..b96d176a6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -86,3 +86,7 @@ src/spicelib/parser/inpptree-parser.c
 src/spicelib/parser/inpptree-parser.h
 # Visual Studio Code user options files
 .vscode/
+
+test_cases/diode/test_osdi/.osdi/diode_va.so
+test_cases/diode/test_osdi/*
+test_cases/diode/test_built_in/*
diff --git a/test_cases/diode/test_diode.py b/test_cases/diode/test_diode.py
index abcbcb39f..628975bf1 100644
--- a/test_cases/diode/test_diode.py
+++ b/test_cases/diode/test_diode.py
@@ -1,19 +1,5 @@
 """ test OSDI simulation of diode
 """
-import types
-from pathlib import Path
-from DMT.core import DutType, Sweep, specifiers, SimCon, Plot, MCard
-from DMT.core.circuit import (
-    Circuit,
-    CircuitElement,
-    RESISTANCE,
-    DIODE,
-    SHORT,
-    VOLTAGE,
-)
-
-from DMT.ngspice import DutNgspice
-
 import os
 import numpy as np
 import subprocess
@@ -30,6 +16,7 @@ import pandas as pd
 # complicated and the results are therefore not exactly the same.
 # Future tests will target Verilog-A models like HICUM/L2 that should yield exactly the same results as the Ngspice implementation.
 
+
 # specify location of Ngspice executable to be tested
 ngspice_path = "../../../debug/src/ngspice"
 
@@ -164,8 +151,8 @@ if __name__ == "__main__":
     plt.semilogx(
         ac_data_osdi["frequency"], ac_data_osdi["i(vsense)"] * 1e3, label="OSDI"
     )
-    plt.xlabel(r"$f(H)$")
-    plt.ylabel(r"$\Re \left\{ \underline{Y}_{11} \right\} (\mathrm{mS})$")
+    plt.xlabel("$f(\\mathrm{H})$")
+    plt.ylabel("$\\Re \\left\{ Y_{11} \\right\} (\\mathrm{mS})$")
     plt.legend()
     fig = plt.figure()
     plt.semilogx(
@@ -180,8 +167,8 @@ if __name__ == "__main__":
         ac_data_osdi["i(vsense).1"] * 1e3 / omega,
         label="OSDI",
     )
-    plt.xlabel(r"$f(\mathrm{H})$")
-    plt.ylabel(r"$\Im \left\{ \underline{Y}_{11} \right\}/(\omega) (\mathrm{mF})$")
+    plt.xlabel("$f(\\mathrm{H})$")
+    plt.ylabel("$\\Im\\left\{Y_{11}\\right\}/(\\omega) (\\mathrm{mF})$")
     plt.legend()
 
     # TR plot