[1.x] Fix test (#3432)

Backport #3321 from main

micromamba/tests/test_install.py

@@ -449,17 +449,42 @@ def test_no_python_pinning(self, existing_cache):
         action_keys = {"LINK", "UNLINK", "PREFIX"}
         assert action_keys.issubset(set(res["actions"].keys()))
 
-        expected_link_packages = {"python"}
+        # When using `--no-py-pin`, it may or may not update the already installed
+        # python version, but `python_abi` is installed in any case
+        # The following tests/assertions consider both cases
+        expected_link_packages = {"python_abi"}
         link_packages = {pkg["name"] for pkg in res["actions"]["LINK"]}
         assert expected_link_packages.issubset(link_packages)
+
         unlink_packages = {pkg["name"] for pkg in res["actions"]["UNLINK"]}
-        assert {"python"}.issubset(unlink_packages)
+        if {"python"}.issubset(link_packages):
+            assert {"python"}.issubset(unlink_packages)
 
-        py_pkg = [pkg for pkg in res["actions"]["LINK"] if pkg["name"] == "python"][0]
-        assert py_pkg["version"] != ("3.9.19")
+            py_pkg = [pkg for pkg in res["actions"]["LINK"] if pkg["name"] == "python"][
+                0
+            ]
+            assert py_pkg["version"] != ("3.9.19")
 
-        py_pkg = [pkg for pkg in res["actions"]["UNLINK"] if pkg["name"] == "python"][0]
-        assert py_pkg["version"] == ("3.9.19")
+            py_pkg = [
+                pkg for pkg in res["actions"]["UNLINK"] if pkg["name"] == "python"
+            ][0]
+            assert py_pkg["version"] == ("3.9.19")
+        else:
+            assert (
+                len(res["actions"]["LINK"]) == 2
+            )  # Should be setuptools and python_abi
+
+            py_abi_pkg = [
+                pkg for pkg in res["actions"]["LINK"] if pkg["name"] == "python_abi"
+            ][0]
+            assert py_abi_pkg["version"] == ("3.9")
+            setuptools_pkg = [
+                pkg for pkg in res["actions"]["LINK"] if pkg["name"] == "setuptools"
+            ][0]
+            assert setuptools_pkg["version"] == ("63.4.3")
+
+            assert len(res["actions"]["UNLINK"]) == 1  # Should be setuptools
+            assert res["actions"]["UNLINK"][0]["name"] == "setuptools"
 
     @pytest.mark.skipif(
         dry_run_tests is DryRun.ULTRA_DRY, reason="Running only ultra-dry tests"