diff --git a/src/test/javacompat.cpp b/src/test/javacompat.cpp
index 7ddda95..a6e6d7b 100644
--- a/src/test/javacompat.cpp
+++ b/src/test/javacompat.cpp
@@ -75,7 +75,16 @@ int main(){
 
     tiny_utf8::string normalString = tiny_utf8::string(normalStdString);
 
+    // check for normal operation
     ASSERT(normalString == importedString);
+
+    // check for mismatched size error
+    std::string javaStdStringCopy = javaStdString;
+    javaStdStringCopy[0]='b';
+    ErrorOr<tiny_utf8::string> errorString = JavaCompat::importJavaString(reinterpret_cast<uint8_t*>(javaStdStringCopy.data()), 0x75);
+    ASSERT(errorString.isError);
+    ASSERT(errorString.errorCode == ErrorCodes::MISMATCHEDSIZE);
+
     std::cout << "Passed Import Java string test." << std::endl;
 
     //using normalString from when we read the file earlier
@@ -91,5 +100,5 @@ int main(){
     std::cout << "Passed Export Java string test." << std::endl;
     delete nextChar;
 
-return 0;
+    return 0;
 }