In Ubuntu20.04, test GVizTest.DrawGViz failed

[ClaraSchumann]

Under the directory test/graphviz, the original base_* version .ps files are seemingly identical to those generated during the execution of gtest, which are prefixed by test_. But their filesizes are different and the assertion EXPECT_TRUE(compareFiles(FNameBase.CStr(), FNameTest.CStr())); in test/test-gviz.cpp, line 70 always fail.

What was the version of graphviz used to generate the original ones?