add test cases for detection module

tests/test_detection.py

@@ -11,8 +11,22 @@ import dopt_sensor_anomalies.types as t
 def img_paths() -> tuple[Path, ...]:
     img_folder = Path(__file__).parent / "_img"
     if not img_folder.exists():
-        raise FileNotFoundError("img path not existing")
+        raise FileNotFoundError("Img path not existing")
-    return tuple(img_folder.glob("*.bmp"))
+    img_paths = tuple(img_folder.glob("*.bmp"))
+    if not img_paths:
+        raise ValueError("No images found")
+    return img_paths
+
+
+@pytest.fixture(scope="module")
+def single_img_path() -> Path:
+    img_folder = Path(__file__).parent / "_img"
+    if not img_folder.exists():
+        raise FileNotFoundError("Img path not existing")
+    img_paths = tuple(img_folder.glob("*_12.bmp"))
+    if not img_paths:
+        raise ValueError("No images found")
+    return img_paths[0]
 
 
 def test_midpoint():
@@ -23,7 +37,6 @@ def test_midpoint():
     assert mid_y == 3.0
 
 
-@pytest.mark.new
 def test_check_box_redundancy_SameBox():
     box_1: t.Box = (
         (64.70450592041016, 505.09185791015625),
@@ -38,7 +51,6 @@ def test_check_box_redundancy_SameBox():
     assert detect.check_box_redundancy(box_1, box_2)
 
 
-@pytest.mark.new
 def test_check_box_redundancy_DifferentBox():
     box_1: t.Box = (
         (64.70450592041016, 505.09185791015625),
@@ -51,3 +63,24 @@ def test_check_box_redundancy_DifferentBox():
         2.35944128036499,
     )
     assert not detect.check_box_redundancy(box_1, box_2)
+
+
+def test_measure_length(single_img_path):
+    pixels_per_metric_X: float = 0.251
+    pixels_per_metric_Y: float = 0.251
+    data, imgs = detect.measure_length(
+        single_img_path,
+        pixels_per_metric_X,
+        pixels_per_metric_Y,
+    )
+    assert len(data) == 18
+    assert isinstance(data[0], str)
+    assert float(data[0].replace(",", ".")) == pytest.approx(1266.932)
+    img_left = imgs["left"]
+    assert 235 < img_left.shape[0] < 260
+    assert 910 < img_left.shape[1] < 960
+    assert img_left.shape[2] == 3
+    img_right = imgs["right"]
+    assert 235 < img_right.shape[0] < 260
+    assert 910 < img_right.shape[1] < 960
+    assert img_right.shape[2] == 3