Some missing test coverage.

include/takane/_height.hpp

@@ -76,7 +76,7 @@ inline auto default_registry() {
  * For vectors or other 1-dimensional objects, the height is usually just the length of the object (for some object-specific definition of "length").
  * For higher-dimensional objects, the height is usually the extent of the first dimension.
  *
- * Applications can supply custom height functions for a given type via the `Options::custom_height`.
+ * Applications can supply custom height functions for a given type via `Options::custom_height`.
  * If available, the supplied custom function will be used instead of the default.
  *
  * @param path Path to a directory representing an object.

include/takane/_validate.hpp

@@ -95,18 +95,14 @@ inline auto default_registry() {
 /**
  * Validate an object in a subdirectory, based on the supplied object type.
  *
- * Applications can supply custom validation functions for a given type via the `Options::custom_validate`.
+ * Applications can supply custom validation functions for a given type via `Options::custom_validate`.
  * If available, the supplied custom function will be used instead of the default.
  *
  * @param path Path to a directory representing an object.
  * @param metadata Metadata for the object, typically determined from its `OBJECT` file.
  * @param options Validation options.
  */
 inline void validate(const std::filesystem::path& path, const ObjectMetadata& metadata, Options& options) {
-    if (!std::filesystem::exists(path) || std::filesystem::status(path).type() != std::filesystem::file_type::directory) {
-        throw std::runtime_error("expected '" + path.string() + "' to be a directory");
-    }
-
     auto cIt = options.custom_validate.find(metadata.type);
     if (cIt != options.custom_validate.end()) {
         try {

tests/src/dispatch.cpp

@@ -15,6 +15,9 @@ TEST(GenericDispatch, Validate) {
 
     opts.custom_validate["foobar"] = [](const std::filesystem::path&, const takane::ObjectMetadata&, const takane::Options&) -> void {};
     test_validate(dir, opts);
+
+    opts.custom_validate["foobar"] = [](const std::filesystem::path&, const takane::ObjectMetadata&, const takane::Options&) -> void { throw std::runtime_error("YAY"); };
+    expect_validation_error(dir, "YAY", opts);
 }
 
 template<typename ... Args_>