test: port BufferIO, Runtime, JsonValidationException tests

JsonValidationExceptionTest passes. BufferIOTest (set_user_inputs is todo!())
and RuntimeTest (html_entity_decode is todo!()) are marked #[ignore].

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/crates/shirabe/tests/json/json_validation_exception_test.rs b/crates/shirabe/tests/json/json_validation_exception_test.rs
index 12620ba..271ca9b 100644
--- a/crates/shirabe/tests/json/json_validation_exception_test.rs
+++ b/crates/shirabe/tests/json/json_validation_exception_test.rs
@@ -1 +1,25 @@
 //! ref: composer/tests/Composer/Test/Json/JsonValidationExceptionTest.php
+
+use shirabe::json::json_validation_exception::JsonValidationException;
+
+#[test]
+fn test_get_errors() {
+    for (message, errors, expected_message, expected_errors) in error_provider() {
+        let object = JsonValidationException::new(message.to_string(), errors.clone());
+        assert_eq!(expected_message, object.get_message());
+        assert_eq!(&expected_errors, object.get_errors());
+    }
+}
+
+#[test]
+fn test_get_errors_when_no_errors_provided() {
+    let object = JsonValidationException::new("test message".to_string(), vec![]);
+    assert_eq!(&Vec::<String>::new(), object.get_errors());
+}
+
+fn error_provider() -> Vec<(&'static str, Vec<String>, &'static str, Vec<String>)> {
+    vec![
+        ("test message", vec![], "test message", vec![]),
+        ("", vec!["foo".to_string()], "", vec!["foo".to_string()]),
+    ]
+}