message: Extend tree_unwrapper tests
diff: @@ -8050,7 +8050,7 @@ const TreeUnwrapperTestData kUnwrapCovergroupTestCases[] = {
  "covergroup cg(string s);"
  "x_cross : cross s1, s2{"
  " bins a = binsof(x) intersect {d};"
  - " bins b = binsof(y) intersect {e};"
  + " bins b = binsof(y) intersect {e, f};"
  "}"
  "endgroup ",
  CovergroupDeclaration(
  @@ -8059,7 +8059,8 @@ const TreeUnwrapperTestData kUnwrapCovergroupTestCases[] = {
  L(2, {"string", "s"}), L(0, {")", ";"})),
  CovergroupItemList(
  1, L(1, {"x_cross", ":", "cross", "s1", ",", "s2", "{"}),
  - CrossItemList(2,
  + CrossItemList(
  + 2,
  N(2,
  L(2, {"bins", "a", "=", "binsof", "(", "x", ")",
  "intersect", "{"}),
  @@ -8067,7 +8068,7 @@ const TreeUnwrapperTestData kUnwrapCovergroupTestCases[] = {
  N(2,
  L(2, {"bins", "b", "=", "binsof", "(", "y", ")",
  "intersect", "{"}),
  - L(3, {"e"}), L(2, {"}", ";"}))),
  + N(3, L(3, {"e", ","}), L(3, {"f"})), L(2, {"}", ";"}))),
  L(1, {"}"})),
  L(0, {"endgroup"})),
  },
  