add a test case for gvmap crash

As discussed on #1822, gvmap currently crashes sometimes. It seems this is not
input dependent, but rather platform dependent. A fix will arrive in an upcoming
commit.

diff --git a/rtest/test_regression.py b/rtest/test_regression.py
index 71c6f3f687b3e5ce665bebf8f1fc529cc605cbf4..326340382439b5a48b30d19adf373ac8737eebc1 100644 (file)
--- a/rtest/test_regression.py
+++ b/rtest/test_regression.py
@@ -948,3 +948,39 @@ def test_vcxproj_inclusive(vcxproj: Path):
 
     assert srcs1 == srcs2, \
       "mismatch between sources in {str(vcxproj)} and {str(filters)}"
+
+@pytest.mark.xfail()
+@pytest.mark.skipif(shutil.which("gvmap") is None, reason="gvmap not available")
+def test_gvmap_fclose():
+  """
+  gvmap should not attempt to fclose(NULL). This example will trigger a crash if
+  this bug has been reintroduced and Graphviz is built with ASan support.
+  """
+
+  # a reasonable input graph
+  input = 'graph "Alík: Na vlastní oči" {\n'                                  \
+          '    graph [bb="0,0,128.9,36",\n'                                      \
+          '            concentrate=true,\n'                                            \
+          '            overlap=prism,\n'                                               \
+          '            start=3\n'                                                      \
+          '    ];\n'                                                             \
+          '    node [label="\\N"];\n'                                            \
+          '    {\n'                                                              \
+          '            bob     [height=0.5,\n'                                             \
+          '                    pos="100.95,18",\n'                                           \
+          '                    width=0.77632];\n'                                            \
+          '    }\n'                                                              \
+          '    {\n'                                                              \
+          '            alice   [height=0.5,\n'                                           \
+          '                    pos="32.497,18",\n'                                           \
+          '                    width=0.9027];\n'                                             \
+          '    }\n'                                                              \
+          '    alice -- bob    [pos="65.119,18 67.736,18 70.366,18 72.946,18"];\n' \
+          '    bob -- alice;\n'                                                  \
+          '}'
+
+  # pass this through gvmap
+  p = subprocess.Popen(["gvmap"], stdin=subprocess.PIPE)
+  p.communicate(input.encode("utf-8"))
+
+  assert p.returncode == 0