add Readme_IVAS_ISAR_enc.txt to test_26252.py

test_dict = {}

TEST_DIR = "."

scripts=["Readme_IVAS_enc.txt", "Readme_IVAS_dec.txt", "Readme_IVAS_rend.txt", "Readme_IVAS_JBM_dec.txt", "Readme_IVAS_ISAR_enc.txt", "Readme_IVAS_ISAR_dec.txt", "Readme_IVAS_ISAR_post_rend.txt"]

scripts=["Readme_IVAS_enc.txt", "Readme_IVAS_ISAR_enc.txt", "Readme_IVAS_dec.txt", "Readme_IVAS_rend.txt", "Readme_IVAS_JBM_dec.txt",  "Readme_IVAS_ISAR_dec.txt", "Readme_IVAS_ISAR_post_rend.txt"]

for s in scripts:

    with open(os.path.join(TEST_DIR, s), "r", encoding="UTF-8") as fp: