Address several warnings raised during tests

qiskit_experiments/library/calibration/fine_drag_cal.py

@@ -66,8 +66,6 @@ def __init__(
             auto_update=auto_update,
         )
 
-        self.set_transpile_options(basis_gates=["sx", schedule_name, "rz"])
-
     @classmethod
     def _default_experiment_options(cls) -> Options:
         """Default experiment options.

qiskit_experiments/test/fake_service.py

@@ -111,33 +111,38 @@ def create_experiment(
         # backend - the query methods `experiment` and `experiments` are supposed to return an
         #    an instantiated backend object, and not only the backend name. We assume that the fake
         #    service works with the fake backend (class FakeBackend).
-        self.exps = pd.concat(
+        row = pd.DataFrame(
             [
-                self.exps,
-                pd.DataFrame(
-                    [
-                        {
-                            "experiment_type": experiment_type,
-                            "experiment_id": experiment_id,
-                            "parent_id": parent_id,
-                            "backend_name": backend_name,
-                            "metadata": metadata,
-                            "job_ids": job_ids,
-                            "tags": tags,
-                            "notes": notes,
-                            "share_level": kwargs.get("share_level", None),
-                            "device_components": [],
-                            "start_datetime": datetime(2022, 1, 1)
-                            + timedelta(hours=len(self.exps)),
-                            "figure_names": [],
-                            "backend": FakeBackend(backend_name=backend_name),
-                        }
-                    ],
-                    columns=self.exps.columns,
-                ),
+                {
+                    "experiment_type": experiment_type,
+                    "experiment_id": experiment_id,
+                    "parent_id": parent_id,
+                    "backend_name": backend_name,
+                    "metadata": metadata,
+                    "job_ids": job_ids,
+                    "tags": tags,
+                    "notes": notes,
+                    "share_level": kwargs.get("share_level", None),
+                    "device_components": [],
+                    "start_datetime": datetime(2022, 1, 1) + timedelta(hours=len(self.exps)),
+                    "figure_names": [],
+                    "backend": FakeBackend(backend_name=backend_name),
+                }
             ],
-            ignore_index=True,
+            columns=self.exps.columns,
         )
+        if len(self.exps) > 0:
+            self.exps = pd.concat(
+                [
+                    self.exps,
+                    row,
+                ],
+                ignore_index=True,
+            )
+        else:
+            # Avoid the FutureWarning on concatenating empty DataFrames
+            # introduced in https://github.com/pandas-dev/pandas/pull/52532
+            self.exps = row
 
         return experiment_id
 
@@ -293,35 +298,39 @@ def create_analysis_result(
         #    `IBMExperimentService.create_analysis_result`. Since `DbExperimentData` does not set it
         #    via kwargs (as it does with chisq), the user cannot control the time and the service
         #    alone decides about it. Here we've chosen to set the start date of the experiment.
-        self.results = pd.concat(
+        row = pd.DataFrame(
             [
-                self.results,
-                pd.DataFrame(
-                    [
-                        {
-                            "result_data": result_data,
-                            "result_id": result_id,
-                            "result_type": result_type,
-                            "device_components": device_components,
-                            "experiment_id": experiment_id,
-                            "quality": quality,
-                            "verified": verified,
-                            "tags": tags,
-                            "backend_name": self.exps.loc[self.exps.experiment_id == experiment_id]
-                            .iloc[0]
-                            .backend_name,
-                            "chisq": kwargs.get("chisq", None),
-                            "creation_datetime": self.exps.loc[
-                                self.exps.experiment_id == experiment_id
-                            ]
-                            .iloc[0]
-                            .start_datetime,
-                        }
-                    ]
-                ),
-            ],
-            ignore_index=True,
+                {
+                    "result_data": result_data,
+                    "result_id": result_id,
+                    "result_type": result_type,
+                    "device_components": device_components,
+                    "experiment_id": experiment_id,
+                    "quality": quality,
+                    "verified": verified,
+                    "tags": tags,
+                    "backend_name": self.exps.loc[self.exps.experiment_id == experiment_id]
+                    .iloc[0]
+                    .backend_name,
+                    "chisq": kwargs.get("chisq", None),
+                    "creation_datetime": self.exps.loc[self.exps.experiment_id == experiment_id]
+                    .iloc[0]
+                    .start_datetime,
+                }
+            ]
         )
+        if len(self.results) > 0:
+            self.results = pd.concat(
+                [
+                    self.results,
+                    row,
+                ],
+                ignore_index=True,
+            )
+        else:
+            # Avoid the FutureWarning on concatenating empty DataFrames
+            # introduced in https://github.com/pandas-dev/pandas/pull/52532
+            self.results = row
 
         # a helper method for updating the experiment's device components, see usage below
         def add_new_components(expcomps):

qiskit_experiments/test/pulse_backend.py

@@ -96,7 +96,7 @@ def __init__(
             None,
             name="PulseBackendV2",
             description="A PulseBackend simulator",
-            online_date=datetime.datetime.utcnow(),
+            online_date=datetime.datetime.now(datetime.timezone.utc),
             backend_version="0.0.1",
         )
 

qiskit_experiments/visualization/drawers/mpl_drawer.py

@@ -147,6 +147,31 @@ def format_canvas(self):
         else:
             all_axes = [self._axis]
 
+        # Set axes scale. This needs to be done before anything tries to work with
+        # the axis limits because if no limits or data are set explicitly the
+        # default limits depend on the scale method (for example, the minimum
+        # value is 0 for linear scaling but not for log scaling).
+        def signed_sqrt(x):
+            return np.sign(x) * np.sqrt(abs(x))
+
+        def signed_square(x):
+            return np.sign(x) * x**2
+
+        for ax_type in ("x", "y"):
+            for sub_ax in all_axes:
+                scale = self.figure_options.get(f"{ax_type}scale")
+                if ax_type == "x":
+                    mpl_setscale = sub_ax.set_xscale
+                else:
+                    mpl_setscale = sub_ax.set_yscale
+
+                # Apply non linear axis spacing
+                if scale is not None:
+                    if scale == "quadratic":
+                        mpl_setscale("function", functions=(signed_square, signed_sqrt))
+                    else:
+                        mpl_setscale(scale)
+
         # Get axis formatter from drawing options
         formatter_opts = {}
         for ax_type in ("x", "y"):
@@ -181,12 +206,6 @@ def format_canvas(self):
                 "max_ax_vals": max_vals,
             }
 
-        def signed_sqrt(x):
-            return np.sign(x) * np.sqrt(abs(x))
-
-        def signed_square(x):
-            return np.sign(x) * x**2
-
         for i, sub_ax in enumerate(all_axes):
             # Add data labels if there are multiple labels registered per sub_ax.
             _, labels = sub_ax.get_legend_handles_labels()
@@ -197,18 +216,15 @@ def signed_square(x):
                 limit = formatter_opts[ax_type]["limit"][i]
                 unit = formatter_opts[ax_type]["unit"][i]
                 unit_scale = formatter_opts[ax_type]["unit_scale"][i]
-                scale = self.figure_options.get(f"{ax_type}scale")
                 min_ax_vals = formatter_opts[ax_type]["min_ax_vals"]
                 max_ax_vals = formatter_opts[ax_type]["max_ax_vals"]
                 share_axis = self.figure_options.get(f"share{ax_type}")
 
                 if ax_type == "x":
-                    mpl_setscale = sub_ax.set_xscale
                     mpl_axis_obj = getattr(sub_ax, "xaxis")
                     mpl_setlimit = sub_ax.set_xlim
                     mpl_share = sub_ax.sharex
                 else:
-                    mpl_setscale = sub_ax.set_yscale
                     mpl_axis_obj = getattr(sub_ax, "yaxis")
                     mpl_setlimit = sub_ax.set_ylim
                     mpl_share = sub_ax.sharey
@@ -219,13 +235,6 @@ def signed_square(x):
                     else:
                         limit = min_ax_vals[i], max_ax_vals[i]
 
-                # Apply non linear axis spacing
-                if scale is not None:
-                    if scale == "quadratic":
-                        mpl_setscale("function", functions=(signed_square, signed_sqrt))
-                    else:
-                        mpl_setscale(scale)
-
                 # Create formatter for axis tick label notation
                 if unit and unit_scale:
                     # If value is specified, automatically scale axis magnitude

test/base.py

@@ -99,6 +99,26 @@ def setUpClass(cls):
             super().setUpClass()
 
             warnings.filterwarnings("error", category=DeprecationWarning)
+            # Tests should not generate any warnings unless testing those
+            # warnings. In that case, the test should catch the warning
+            # assertWarns or warnings.catch_warnings.
+            warnings.filterwarnings("error", module="qiskit_experiments")
+            # Ideally, changes introducing pending deprecations should include
+            # alternative code paths and not need to generate warnings in the
+            # tests but until this exception is necessary until the use of the
+            # deprecated ScatterTable methods are removed.
+            warnings.filterwarnings(
+                "default",
+                module="qiskit_experiments",
+                message=".*Curve data uses dataframe representation.*",
+                category=PendingDeprecationWarning,
+            )
+            warnings.filterwarnings(
+                "default",
+                module="qiskit_experiments",
+                message=".*The curve data representation is replaced with dataframe format.*",
+                category=PendingDeprecationWarning,
+            )
 
             # Some functionality may be deprecated in Qiskit Experiments. If
             # the deprecation warnings aren't filtered, the tests will fail as