test: update cli test for coregistration

Author: vschaffn

tests/test_cli.py

@@ -1,14 +1,19 @@
 """Function to test the CLI"""
-
+import os
 import subprocess
 
+import rasterio
+
 import xdem
+from xdem import dem_coregistration
 
 
 class TestCLI:
     # Define paths to the DEM files using xDEM examples
     ref_dem_path = xdem.examples.get_path("longyearbyen_ref_dem")
     tba_dem_path = xdem.examples.get_path("longyearbyen_tba_dem")
+    aligned_dem_path = "aligned_dem.tiff"
+    inlier_mask_path = "inlier_mask.tiff"
 
     def test_xdem_cli(self) -> None:
         try:
@@ -18,9 +23,32 @@ def test_xdem_cli(self) -> None:
                 capture_output=True,
                 text=True,
             )
-            assert "hello world" in result.stdout
+
+            # Assert ClI ran successfully
             assert result.returncode == 0
 
+            # Verify the existence of the output files
+            assert os.path.exists(self.aligned_dem_path), f"Aligned DEM not found: {self.aligned_dem_path}"
+            assert os.path.exists(self.inlier_mask_path), f"Inlier mask not found: {self.inlier_mask_path}"
+
+            # Retrieve ground truth
+            true_coreg_dem, coreg_method, out_stats, true_inlier_mask = dem_coregistration(
+                xdem.DEM(self.tba_dem_path), xdem.DEM(self.ref_dem_path), self.aligned_dem_path
+            )
+
+            # Load elements processed by the xDEM CLI command
+            aligned_dem = xdem.DEM(self.aligned_dem_path)
+            with rasterio.open(self.inlier_mask_path) as src:
+                inlier_mask = src.read(1)
+
+            # Verify match with ground truth
+            assert aligned_dem == true_coreg_dem, "Aligned DEM does not match the ground truth."
+            assert inlier_mask.all() == true_inlier_mask.all(), "Inlier mask does not match the ground truth."
+
+            # Erase files
+            os.remove(self.aligned_dem_path)
+            os.remove(self.inlier_mask_path)
+
         except FileNotFoundError as e:
             # In case 'xdem' is not found
             raise AssertionError(f"CLI command 'xdem' not found : {e}")