Fix test assertions to match improved error messages

Co-authored-by: CodyCBakerPhD <51133164+CodyCBakerPhD@users.noreply.github.com>

Author: Copilot

dandi/tests/test_move.py

@@ -374,9 +374,14 @@ def test_move_nonexistent_src(
             work_on=work_on,
             dandi_instance=moving_dandiset.api.instance_id,
         )
-    assert (
-        str(excinfo.value)
-        == f"No asset at {'remote' if work_on == 'remote' else 'local'} path 'subdir1/avocado.txt'"
+    assert str(excinfo.value) == (
+        f"No asset at {'remote' if work_on == MoveWorkOn.REMOTE else 'local'} path 'subdir1/avocado.txt'. "
+        + (
+            "Verify the path is correct and the asset exists on the server. "
+            "Use 'dandi ls' to list available assets."
+            if work_on == MoveWorkOn.REMOTE
+            else "Verify the path is correct and the file exists locally."
+        )
     )
     check_assets(moving_dandiset, starting_assets, work_on, {})
 
@@ -402,7 +407,8 @@ def test_move_file_slash_src(
         )
     assert (
         str(excinfo.value)
-        == f"{'Remote' if work_on == 'remote' else 'Local'} path 'subdir1/apple.txt/' is a file"
+        == f"{'Remote' if work_on == MoveWorkOn.REMOTE else 'Local'} path 'subdir1/apple.txt/' is a file but a directory was expected. "
+        "Use a path ending with '/' for directories."
     )
     check_assets(moving_dandiset, starting_assets, work_on, {})
 
@@ -427,7 +433,8 @@ def test_move_file_slash_dest(
         )
     assert (
         str(excinfo.value)
-        == f"{'Remote' if work_on == 'remote' else 'Local'} path 'subdir1/apple.txt/' is a file"
+        == f"{'Remote' if work_on == MoveWorkOn.REMOTE else 'Local'} path 'subdir1/apple.txt/' is a file but a directory was expected. "
+        "Use a path ending with '/' for directories."
     )
     check_assets(moving_dandiset, starting_assets, work_on, {})
 
@@ -593,9 +600,14 @@ def test_move_from_subdir_abspaths(
             work_on=work_on,
             dandi_instance=moving_dandiset.api.instance_id,
         )
-    assert (
-        str(excinfo.value)
-        == f"No asset at {'remote' if work_on == 'remote' else 'local'} path 'file.txt'"
+    assert str(excinfo.value) == (
+        f"No asset at {'remote' if work_on == MoveWorkOn.REMOTE else 'local'} path 'file.txt'. "
+        + (
+            "Verify the path is correct and the asset exists on the server. "
+            "Use 'dandi ls' to list available assets."
+            if work_on == MoveWorkOn.REMOTE
+            else "Verify the path is correct and the file exists locally."
+        )
     )
     check_assets(moving_dandiset, starting_assets, work_on, {})
 
@@ -619,7 +631,11 @@ def test_move_from_subdir_as_dot(
             dandi_instance=moving_dandiset.api.instance_id,
             devel_debug=True,
         )
-    assert str(excinfo.value) == "Cannot move current working directory"
+    assert (
+        str(excinfo.value)
+        == "Cannot move current working directory. "
+        "Change to a different directory before moving this location."
+    )
     check_assets(moving_dandiset, starting_assets, work_on, {})