diff --git a/model/common/src/icon4py/model/common/type_alias.py b/model/common/src/icon4py/model/common/type_alias.py
index 9fbdbd576e..4ca01a06ed 100644
--- a/model/common/src/icon4py/model/common/type_alias.py
+++ b/model/common/src/icon4py/model/common/type_alias.py
@@ -16,9 +16,11 @@
 from gt4py.next.ffront.fbuiltins import float32, float64
 
 
+DEFAULT_PRECISION = "double"
+
 wpfloat: TypeAlias = float64
 
-precision = os.environ.get("FLOAT_PRECISION", "double").lower()
+precision = os.environ.get("FLOAT_PRECISION", DEFAULT_PRECISION).lower()
 if precision == "double":
     vpfloat = wpfloat
 elif precision == "mixed":
diff --git a/tools/tests/conftest.py b/tools/tests/conftest.py
new file mode 100644
index 0000000000..d9a0c2ac4c
--- /dev/null
+++ b/tools/tests/conftest.py
@@ -0,0 +1,26 @@
+# ICON4Py - ICON inspired code in Python and GT4Py
+#
+# Copyright (c) 2022, ETH Zurich and MeteoSwiss
+# All rights reserved.
+#
+# This file is free software: you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the
+# Free Software Foundation, either version 3 of the License, or any later
+# version. See the LICENSE.txt file at the top-level directory of this
+# distribution for a copy of the license or check <https://www.gnu.org/licenses/>.
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+import os
+from importlib import reload
+
+import icon4py.model.common.type_alias as type_alias
+import pytest
+from click.testing import CliRunner
+
+
+@pytest.fixture
+def cli():
+    yield CliRunner()
+    os.environ["FLOAT_PRECISION"] = type_alias.DEFAULT_PRECISION
+    reload(type_alias)
diff --git a/tools/tests/icon4pygen/test_codegen.py b/tools/tests/icon4pygen/test_codegen.py
index 35d09c6a41..8f9fae6746 100644
--- a/tools/tests/icon4pygen/test_codegen.py
+++ b/tools/tests/icon4pygen/test_codegen.py
@@ -21,7 +21,6 @@
 import icon4py.model.common.interpolation.stencils as intp
 import icon4py.model.common.type_alias as type_alias
 import pytest
-from click.testing import CliRunner
 from gt4py.next.ffront.fbuiltins import float32, float64
 
 from icon4pytools.icon4pygen.cli import main
@@ -38,11 +37,6 @@
 OUTPATH = "."
 
 
-@pytest.fixture
-def cli():
-    return CliRunner()
-
-
 def dycore_fencils() -> list[tuple[str, str]]:
     return _fencils(dycore.__file__, DYCORE_PKG)