fix: handle Windows paths in adk eval

src/google/adk/cli/cli_eval.py

@@ -117,15 +117,27 @@ def parse_and_get_evals_to_run(
   eval_set_to_evals: dict[str, list[str]] = {}
   for input_eval_set in evals_to_run_info:
     evals = []
-    if ":" not in input_eval_set:
+    drive_letter = input_eval_set[:1]
+    has_windows_drive_prefix = (
+        len(input_eval_set) >= 3
+        and drive_letter.isascii()
+        and drive_letter.isalpha()
+        and input_eval_set[1] == ":"
+        and input_eval_set[2] in ("\\", "/")
+    )
+    selector_separator_index = input_eval_set.find(
+        ":", 3 if has_windows_drive_prefix else 0
+    )
+    if selector_separator_index == -1:
       # We don't have any eval cases specified. This would be the case where the
       # the user wants to run all eval cases in the eval set.
       eval_set = input_eval_set
     else:
       # There are eval cases that we need to parse. The user wants to run
       # specific eval cases from the eval set.
-      eval_set = input_eval_set.split(":")[0]
-      evals = input_eval_set.split(":")[1].split(",")
+      eval_set = input_eval_set[:selector_separator_index]
+      selector_list = input_eval_set[selector_separator_index + 1 :]
+      evals = selector_list.split(":")[0].split(",")
       evals = [s for s in evals if s.strip()]
 
     if eval_set not in eval_set_to_evals:

tests/unittests/cli/utils/test_cli_eval.py

@@ -19,6 +19,67 @@
 from types import SimpleNamespace
 from unittest import mock
 
+import pytest
+
+
+@pytest.mark.parametrize(
+    ("input_eval_set", "expected"),
+    [
+        pytest.param(
+            r"C:\tmp\agent\eval.evalset.json",
+            {r"C:\tmp\agent\eval.evalset.json": []},
+            id="windows-backslash-path-without-selectors",
+        ),
+        pytest.param(
+            r"C:\tmp\agent\eval.evalset.json:case1",
+            {r"C:\tmp\agent\eval.evalset.json": ["case1"]},
+            id="windows-backslash-path-with-one-selector",
+        ),
+        pytest.param(
+            r"C:\tmp\agent\eval.evalset.json:case1,case2",
+            {r"C:\tmp\agent\eval.evalset.json": ["case1", "case2"]},
+            id="windows-backslash-path-with-multiple-selectors",
+        ),
+        pytest.param(
+            "C:/tmp/agent/eval.evalset.json:case1",
+            {"C:/tmp/agent/eval.evalset.json": ["case1"]},
+            id="windows-forward-slash-path",
+        ),
+        pytest.param(
+            r"d:\tmp\agent\eval.evalset.json:case1",
+            {r"d:\tmp\agent\eval.evalset.json": ["case1"]},
+            id="lowercase-windows-drive",
+        ),
+        pytest.param(
+            "/tmp/agent/eval.evalset.json:case1,case2",
+            {"/tmp/agent/eval.evalset.json": ["case1", "case2"]},
+            id="posix-path-with-selectors",
+        ),
+        pytest.param(
+            "my_eval_set:case1,case2",
+            {"my_eval_set": ["case1", "case2"]},
+            id="eval-set-id-with-selectors",
+        ),
+        pytest.param(
+            "my_eval_set",
+            {"my_eval_set": []},
+            id="eval-set-id-without-selectors",
+        ),
+        pytest.param(
+            "/tmp/agent/eval.evalset.json",
+            {"/tmp/agent/eval.evalset.json": []},
+            id="posix-path-without-selectors",
+        ),
+    ],
+)
+def test_parse_and_get_evals_to_run_parses_eval_set_and_selectors(
+    input_eval_set: str, expected: dict[str, list[str]]
+):
+  """Eval-set paths and IDs retain their optional case selectors."""
+  from google.adk.cli.cli_eval import parse_and_get_evals_to_run
+
+  assert parse_and_get_evals_to_run([input_eval_set]) == expected
+
 
 def test_get_eval_sets_manager_local(monkeypatch):
   mock_local_manager = mock.MagicMock()