[ci] Add validate.*.yaml for config-only component tests (#16384)

script/helpers.py

@@ -117,7 +117,7 @@ def get_component_from_path(file_path: str) -> str | None:
 
 
 def get_component_test_files(
-    component: str, *, all_variants: bool = False
+    component: str, *, all_variants: bool = False, include_validate: bool = False
 ) -> list[Path]:
     """Get test files for a component.
 
@@ -126,6 +126,10 @@ def get_component_test_files(
         all_variants: If True, returns all test files including variants (test-*.yaml).
                      If False, returns only base test files (test.*.yaml).
                      Default is False.
+        include_validate: If True, also returns config-only files (validate.*.yaml,
+                     and validate-*.yaml when all_variants is True). These files
+                     are validated with `esphome config` but never compiled.
+                     Default is False.
 
     Returns:
         List of test file paths for the component, or empty list if none exist
@@ -136,9 +140,27 @@ def get_component_test_files(
 
     if all_variants:
         # Match both test.*.yaml and test-*.yaml patterns
-        return list(tests_dir.glob("test[.-]*.yaml"))
+        files = list(tests_dir.glob("test[.-]*.yaml"))
+        if include_validate:
+            files.extend(tests_dir.glob("validate[.-]*.yaml"))
+        return files
     # Match only test.*.yaml (base tests)
-    return list(tests_dir.glob("test.*.yaml"))
+    files = list(tests_dir.glob("test.*.yaml"))
+    if include_validate:
+        files.extend(tests_dir.glob("validate.*.yaml"))
+    return files
+
+
+def is_validate_only_file(test_file: Path) -> bool:
+    """Return True if the given path is a config-only validate file.
+
+    Validate files follow the same grammar as test files but with a
+    ``validate`` prefix instead of ``test``: ``validate.<platform>.yaml``
+    or ``validate-<variant>.<platform>.yaml``. They are exercised with
+    ``esphome config`` only and skipped during compile.
+    """
+    name = test_file.name
+    return name.startswith("validate.") or name.startswith("validate-")
 
 
 @dataclass(frozen=True)