add unit test for shapes of correction LUTs

tests/conftest.py

@@ -12,6 +12,7 @@ def test_paths():
     test_paths.safe = f"{test_path}/data/S1A_IW_SLC__1SDV_20200511T135117_20200511T135144_032518_03C421_7768.zip"
     test_paths.orbit_dir = f"{test_path}/data/orbits"
     test_paths.orbit_file = "S1A_OPER_AUX_POEORB_OPOD_20210318T120818_V20200510T225942_20200512T005942.EOF"
+    test_paths.dem_file = f"{test_path}/data/dummy_dem.tif"
 
     return test_paths
 
@@ -21,7 +22,6 @@ def bursts(test_paths):
     pol = 'vv'
 
     orbit_path = f'{test_paths.orbit_dir}/{test_paths.orbit_file}'
-    bursts = s1_reader.load_bursts(test_paths.safe, orbit_path, i_subswath,
-                                   pol)
+    bursts = s1_reader.load_bursts(test_paths.safe, orbit_path, i_subswath, pol)
 
     return bursts

tests/test_corrections.py

@@ -0,0 +1,20 @@
+def test_correction_shapes(bursts, test_paths):
+    az_step, rg_step = 0.25, 200
+
+    for burst in bursts:
+        az_fm_mismatch = burst.az_fm_rate_mismatch_mitigation(
+            test_paths.dem_file, range_step=rg_step, az_step=az_step
+        )
+        shape = (az_fm_mismatch.length, az_fm_mismatch.width)
+
+        # Make sure the other two corrections have the same shape
+        geometrical_steering_doppler = burst.doppler_induced_range_shift(
+            range_step=rg_step, az_step=az_step
+        )
+        assert shape == (
+            geometrical_steering_doppler.length,
+            geometrical_steering_doppler.width,
+        )
+
+        bistatic_delay = burst.bistatic_delay(range_step=rg_step, az_step=az_step)
+        assert shape == (bistatic_delay.length, bistatic_delay.width)