Attempt to avoid reflection problems in tests

Author: ascopes

java-compiler-testing/src/test/java/io/github/ascopes/jct/compilers/AbstractJctCompilerTest.java

@@ -1836,11 +1836,8 @@ final <T> List<T> concat(List<T> first, List<T>... more) {
 
   AbstractObjectAssert<?, ?> assertThatCompilerField(String field) {
     try {
-      var fieldObj = AbstractJctCompiler.class.getDeclaredField(field);
-      fieldObj.setAccessible(true);
-      var fieldValue = fieldObj.get(compiler);
-      return assertThat(fieldValue)
-          .as("CompilerImpl.%s (%s)", field, fieldValue);
+      return assertThat(compiler)
+          .extracting(field);
     } catch (ReflectiveOperationException ex) {
       return fail("Failed to extract field " + field, ex);
     }