Add test for pet-file

- Add test which reads a "default"-pet file and writes it out and then compares them
- Detect differences in reading/writing/overall file format
- fix: ColorMarker read in saturation for value

src/colorMarkerWidget.cpp

@@ -132,7 +132,7 @@ void ColorMarkerWidget::getXml(QDomElement &elem)
             {
                 fromHue = h;
                 fromSat = s;
-                fromVal = s;
+                fromVal = v;
                 fromTriangle->setColor(col);
                 styleString = QString("background-color: hsv(%1,%2,%3)").arg(h).arg(s).arg(v);
                 fromColor->setStyleSheet(styleString);

tests/regression_test/tests/test_pet.py

+#
+# PeTrack - Software for tracking pedestrians movement in videos
+# Copyright (C) 2023 Forschungszentrum Jülich GmbH, IAS-7
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
+
+import subprocess
+from pytest import approx
+import xml.etree.ElementTree as ET
+
+
+def compare_xml(test: ET.ElementTree, truth: ET.ElementTree):
+    for test_elem, truth_elem in zip(test.iter(), truth.iter()):
+        for test_attrib, truth_attrib in zip(
+            test_elem.attrib.items(), truth_elem.attrib.items()
+        ):
+            assert test_attrib[0] == truth_attrib[0]
+
+            if test_attrib[0] == "SOURCE_FRAME_IN":
+                # in 00_empty.pet = -1; but -1 gets read as 0, i.e. beginning of video
+                # need extra comparison for this
+                assert int(test_attrib[1]) == 0 and int(truth_attrib[1]) == -1
+                continue
+
+            try:
+                # treat all numeric values as float for comparison
+                test_value = float(test_attrib[1])
+                truth_value = float(truth_attrib[1])
+                assert test_value == approx(
+                    truth_value, abs=0.0001
+                ), f"Failed comparion on {test_elem.tag}/{test_attrib[0]}"
+            except:
+                assert (
+                    test_attrib[1] == truth_attrib[1]
+                ), f"Failed comparion on {test_elem.tag}/{test_attrib[0]}"
+
+
+def test_defaultPet(pytestconfig):
+    petrack_path = pytestconfig.getoption("path")
+    ground_truth = "../../../demo/00_files/00_empty.pet"
+    output = "../data/defaultPetTest.pet"
+
+    # open and save (only saving would write last opened video as SRC)
+    subprocess.run(
+        [
+            petrack_path,
+            "-project",
+            ground_truth,
+            "-autosave",
+            output,
+            "-platform",
+            "offscreen",
+        ],
+        check=True,
+    )
+
+    test_pet = ET.parse(output)
+    truth_pet = ET.parse(ground_truth)
+    compare_xml(test_pet, truth_pet)