docs(test): correct test filenames when mentioned elsewhere

Author: amyheather

README.md

@@ -143,7 +143,7 @@ As an alternative, a `requirements.txt` file is provided which can be used to se
 
 🔎 **Tests**
 
-To run tests, ensure environment is active and located in main directory (i.e. parent of `tests/`) and then run the following command. The tests may take around one minute to run. As they run, you will see '.' if the test passes and 'F' if it fails (e.g. `tests/test_model.py ..F..`). When it finishes, you will see the final result (e.g. `==== 1 failed, 4 passed in 51s ====`)
+To run tests, ensure environment is active and located in main directory (i.e. parent of `tests/`) and then run the following command. The tests may take around one minute to run. As they run, you will see '.' if the test passes and 'F' if it fails (e.g. `tests/test_backtest.py ..F..`). When it finishes, you will see the final result (e.g. `==== 1 failed, 4 passed in 51s ====`)
 
 ```
 pytest

notebooks/generate_exp_results.ipynb

@@ -6,7 +6,7 @@
    "source": [
     "## Generate expected results\n",
     "\n",
-    "This notebook is used to run a specific version of the model and save each results dataframe as a csv. These are used in `test_model.py` to verify that the model produces consistent results.\n",
+    "This notebook is used to run a specific version of the model and save each results dataframe as a csv. These are used in `test_backtest.py` to verify that the model produces consistent results.\n",
     "\n",
     "The notebook is provided as it is possible that results may change due to alterations to the model structure and operations. Once it has been confirmed that changes are intentional and not any introduced errors, this script can be run to regenerate the `.csv` files used in the test.\n",
     "\n",