Update test_lab.py

Revert accidental changes from another task.

tests/test_lab.py

@@ -19,13 +19,9 @@
 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
-
-from os import path, remove
-import time
-
 import pytest
 
-from RPC_Test_Common import get_dir_path, reset_to_default_file
+from RPC_Test_Common import reset_to_default_file
 
 
 def test_model_build_lab(mc):
@@ -170,48 +166,3 @@ def test_external_custom_loss_functions(mc):
 
     mc.remove_external_custom_loss(removed_name)
     assert mc.get_variable("NumCustomLossesExternal_Lab") == no_external_losses + 1
-
-
-def test_lab_model_export(mc):
-    mc.set_variable("MessageDisplayState", 2)
-    file_path = get_dir_path() + r"\test_files\temp_files\lab_model_export.lab"
-
-    mc.load_template("e3")
-
-    if path.exists(file_path):
-        remove(file_path)
-
-    assert path.exists(file_path) is False
-
-    mc.export_lab_model(file_path)
-
-    # Exporting the lab model takes a few seconds and so a delay is required before
-    # asserting the .lab file is present.
-    checks = 0
-
-    while checks < 20:
-        time.sleep(1)
-        if path.exists(file_path) is False:
-            checks += 1
-        else:
-            break
-
-    assert path.exists(file_path) is True
-
-    remove(file_path)
-
-    # Checks that a warning is raised if the model build speed has changed
-    mc.set_variable("LabModel_Saturation_StatorCurrent_Peak", 750)
-
-    with pytest.raises(Exception) as stator_current_changed_error:
-        mc.export_lab_model(file_path)
-
-    assert "maximum current has changed" in str(stator_current_changed_error)
-
-    # Clears lab model and checks a warning has been raised
-    mc.clear_model_build_lab()
-
-    with pytest.raises(Exception) as model_not_built_error:
-        mc.export_lab_model(file_path)
-
-    assert "model has not been built" in str(model_not_built_error)