lib: rework how we "override" assert()

The previous method, using zassert.h and hoping nothing includes
assert.h (which, on glibc at least, just does "#undef assert" and puts
its own definition in...) was fragile - and actually broke undetected.

Just provide our own assert.h and control overriding by putting it in a
separate directory to add to the include path (or not.)

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>

1 files changed, 56 insertions, 0 deletions

diff --git a/tests/lib/test_assert.py b/tests/lib/test_assert.py
new file mode 100644
index 0000000000..67c88e6220
--- /dev/null
+++ b/tests/lib/test_assert.py
@@ -0,0 +1,56 @@
+import frrtest
+import os
+import re
+import subprocess
+import inspect
+
+basedir = os.path.dirname(__file__)
+program = os.path.join(basedir, "test_assert")
+
+
+def check(number, rex=None):
+    proc = subprocess.Popen(
+        [frrtest.binpath(program), str(number)],
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+    )
+    out, err = proc.communicate()
+    exitcode = proc.wait()
+
+    if rex is None:
+        assert exitcode == 0
+    else:
+        assert exitcode != 0
+
+        text = out.decode("US-ASCII") + err.decode("US-ASCII")
+        rex = re.compile(rex, re.M | re.S)
+        m = rex.search(text)
+        assert m is not None, "non-matching output: %s" % text
+
+
+def test_assert_0():
+    check(0, r"test_assert\.c:\d+.*number > 0")
+
+
+def test_assert_1():
+    check(1, r"test_assert\.c:\d+.*number > 1.*\(B\) the number was 1")
+
+
+def test_assert_2():
+    check(2, r"test_assert\.c:\d+.*number > 2")
+
+
+def test_assert_3():
+    check(3, r"test_assert\.c:\d+.*number > 3.*\(A\) the number was 3")
+
+
+def test_assert_4():
+    check(4, r"test_assert\.c:\d+.*number > 4")
+
+
+def test_assert_10():
+    check(10, r"test_assert\.c:\d+.*number > 10.*\(D\) the number was 10")
+
+
+def test_assert_11():
+    check(11)