Generate useful parameterization IDs for complex() numbers.

AUTHORS

@@ -125,6 +125,7 @@ Gene Wood
 George Kussumoto
 Georgy Dyuldin
 Gleb Nikonorov
+Graeme Smecher
 Graham Horler
 Greg Price
 Gregory Lee

changelog/8898.trivial.rst

@@ -0,0 +1 @@
+Complex numbers are now treated like floats and integers when generating parameterization IDs.

src/_pytest/python.py

@@ -1334,7 +1334,7 @@ def _idval(
 
     if isinstance(val, STRING_TYPES):
         return _ascii_escaped_by_config(val, config)
-    elif val is None or isinstance(val, (float, int, bool)):
+    elif val is None or isinstance(val, (float, int, bool, complex)):
         return str(val)
     elif isinstance(val, REGEX_TYPE):
         return ascii_escaped(val.pattern)

testing/python/metafunc.py

@@ -403,6 +403,7 @@ class TestMetafunc:
                 pytest.param(tuple("eight"), (8, -8, 8)),
                 pytest.param(b"\xc3\xb4", b"name"),
                 pytest.param(b"\xc3\xb4", "other"),
+                pytest.param(1.0j, -2.0j),
             ],
         )
         assert result == [
@@ -418,6 +419,7 @@ class TestMetafunc:
             "a9-b9",
             "\\xc3\\xb4-name",
             "\\xc3\\xb4-other",
+            "1j-(-0-2j)",
         ]
 
     def test_idmaker_non_printable_characters(self) -> None: