public void summarize() {
DmdlSemantics resolved = resolve();
ModelDeclaration simple = resolved.findModelDeclaration("simple");
assertThat(simple, not(nullValue()));
PropertyDeclaration key = simple.findPropertyDeclaration("key");
assertThat(key, not(nullValue()));
assertThat(key.getType(), is(type(BasicTypeKind.INT)));
PropertyDeclaration sum = simple.findPropertyDeclaration("sum");
assertThat(sum, not(nullValue()));