added the test for the modified nowccast interfaces

pysteps/tests/test_interfaces.py

@@ -360,3 +360,43 @@ def test_tracking_interface():
 
     invalid_names = ["lucas-kanade", "dating"]
     _generic_interface_test(method_getter, valid_names_func_pair, invalid_names)
+
+
+def test_nowcasts_interface():
+    """Test the discover_nowcasts and nowcasts_info function."""
+    from pysteps.nowcasts.interface import discover_nowcasts
+    from pysteps.nowcasts.interface import nowcasts_info
+
+    # Clear the existing methods to test the discovery process
+    global _nowcast_methods
+    # Call the function to get nowcasts info
+    available_nowcasts, nowcasts_in_interface = nowcasts_info()
+
+    # Call the function to discover nowcasts
+    discover_nowcasts()
+
+    # Check if the expected methods are added
+    expected_methods = [
+        "anvil",
+        "eulerian",
+        "extrapolation",
+        "lagrangian",
+        "lagrangian_probability",
+        "linda",
+        "probability",
+        "sprog",
+        "sseps",
+        "steps",
+        "dgmr",
+    ]
+
+    for method in expected_methods:
+        if method == "dgmr":
+            assert (
+                method in nowcasts_in_interface
+            ), f"Method {method} not found in discovered nowcasts. Please intall dgmr_plugin through 'pip install dgmr_plugin'"
+        assert (
+            method in nowcasts_in_interface
+        ), f"Method {method} not found in discovered nowcasts."
+
+    print("All expected nowcast methods discovered successfully.")