tests/float: Test domain errors for more combos of args to math funcs.

Instead of having a special set of arguments to test for each math-module
function, just test all functions with all sets of arguments.  This gives
improved test cases to prevent regressions.

Signed-off-by: Damien George <damien@micropython.org>

tests/float/math_domain_python311.py

@@ -0,0 +1,26 @@
+# Tests domain errors in math functions.
+# This is split out from math_domain.py because math.pow(0, -inf) was changed
+# in Python 3.11, and so this test requires a .py.exp file.
+# (See https://github.com/python/cpython/issues/88505)
+
+try:
+    import math
+except ImportError:
+    print("SKIP")
+    raise SystemExit
+
+inf = float("inf")
+
+for name, f in (
+    ("pow", math.pow),
+    ("log", math.log),
+    ("fmod", math.fmod),
+    ("atan2", math.atan2),
+    ("copysign", math.copysign),
+):
+    for x in ((0, -inf),):
+        try:
+            ans = "%.4f" % f(*x)
+        except ValueError:
+            ans = "ValueError"
+        print("%s(%.4f, %.4f) = %s" % (name, x[0], x[1], ans))