diff --git a/pympipool/__init__.py b/pympipool/__init__.py
index 6acc2e66..f6e0ee3d 100644
--- a/pympipool/__init__.py
+++ b/pympipool/__init__.py
@@ -4,6 +4,7 @@
 from pympipool.shell.executor import SubprocessExecutor
 from pympipool.shell.interactive import ShellExecutor
 from pympipool.shared.dependencies import ExecutorWithDependencies
+from pympipool.shared.inputcheck import check_refresh_rate as _check_refresh_rate
 
 
 __version__ = get_versions()["version"]
@@ -149,10 +150,7 @@ def __new__(
                 refresh_rate=refresh_rate,
             )
         else:
-            if refresh_rate != 0.01:
-                raise ValueError(
-                    "The sleep_interval parameter is only used when disable_dependencies=False."
-                )
+            _check_refresh_rate(refresh_rate=refresh_rate)
             return create_executor(
                 max_cores=max_cores,
                 cores_per_worker=cores_per_worker,
diff --git a/pympipool/scheduler/__init__.py b/pympipool/scheduler/__init__.py
index 10d6b798..ff8d2f00 100644
--- a/pympipool/scheduler/__init__.py
+++ b/pympipool/scheduler/__init__.py
@@ -12,6 +12,8 @@
     check_threads_per_core,
     check_oversubscribe,
     check_executor,
+    check_backend,
+    check_init_function,
 )
 from pympipool.scheduler.slurm import (
     PySlurmExecutor,
@@ -79,16 +81,9 @@ def create_executor(
         command_line_argument_lst (list): Additional command line arguments for the srun call (SLURM only)
 
     """
-    if not block_allocation and init_function is not None:
-        raise ValueError("")
-    if backend not in ["auto", "mpi", "slurm", "flux"]:
-        raise ValueError(
-            'The currently implemented backends are ["flux", "mpi", "slurm"]. '
-            'Alternatively, you can select "auto", the default option, to automatically determine the backend. But '
-            + backend
-            + " is not a valid choice."
-        )
-    elif backend == "flux" or (backend == "auto" and flux_installed):
+    check_init_function(block_allocation=block_allocation, init_function=init_function)
+    check_backend(backend=backend)
+    if backend == "flux" or (backend == "auto" and flux_installed):
         check_oversubscribe(oversubscribe=oversubscribe)
         check_command_line_argument_lst(
             command_line_argument_lst=command_line_argument_lst
diff --git a/pympipool/shared/inputcheck.py b/pympipool/shared/inputcheck.py
index e4a53870..69e6f87e 100644
--- a/pympipool/shared/inputcheck.py
+++ b/pympipool/shared/inputcheck.py
@@ -56,3 +56,25 @@ def check_resource_dict_is_empty(resource_dict):
         raise ValueError(
             "When block_allocation is enabled, the resource requirements have to be defined on the executor level."
         )
+
+
+def check_refresh_rate(refresh_rate):
+    if refresh_rate != 0.01:
+        raise ValueError(
+            "The sleep_interval parameter is only used when disable_dependencies=False."
+        )
+
+
+def check_backend(backend):
+    if backend not in ["auto", "mpi", "slurm", "flux"]:
+        raise ValueError(
+            'The currently implemented backends are ["flux", "mpi", "slurm"]. '
+            'Alternatively, you can select "auto", the default option, to automatically determine the backend. But '
+            + backend
+            + " is not a valid choice."
+        )
+
+
+def check_init_function(block_allocation, init_function):
+    if not block_allocation and init_function is not None:
+        raise ValueError("")
diff --git a/tests/test_shared_input_check.py b/tests/test_shared_input_check.py
new file mode 100644
index 00000000..bf1076f2
--- /dev/null
+++ b/tests/test_shared_input_check.py
@@ -0,0 +1,59 @@
+import unittest
+
+from pympipool.shared.inputcheck import (
+    check_command_line_argument_lst,
+    check_gpus_per_worker,
+    check_threads_per_core,
+    check_oversubscribe,
+    check_executor,
+    check_backend,
+    check_init_function,
+    check_refresh_rate,
+    check_resource_dict,
+    check_resource_dict_is_empty,
+)
+
+
+class TestInputCheck(unittest.TestCase):
+    def test_check_command_line_argument_lst(self):
+        with self.assertRaises(ValueError):
+            check_command_line_argument_lst(command_line_argument_lst=["a"])
+
+    def test_check_gpus_per_worker(self):
+        with self.assertRaises(TypeError):
+            check_gpus_per_worker(gpus_per_worker=1)
+
+    def test_check_threads_per_core(self):
+        with self.assertRaises(TypeError):
+            check_threads_per_core(threads_per_core=2)
+
+    def test_check_oversubscribe(self):
+        with self.assertRaises(ValueError):
+            check_oversubscribe(oversubscribe=True)
+
+    def test_check_executor(self):
+        with self.assertRaises(ValueError):
+            check_executor(executor=1)
+
+    def test_check_backend(self):
+        with self.assertRaises(ValueError):
+            check_backend(backend="test")
+
+    def test_check_init_function(self):
+        with self.assertRaises(ValueError):
+            check_init_function(init_function=1, block_allocation=False)
+
+    def test_check_refresh_rate(self):
+        with self.assertRaises(ValueError):
+            check_refresh_rate(refresh_rate=1)
+
+    def test_check_resource_dict(self):
+        def simple_function(resource_dict):
+            return resource_dict
+
+        with self.assertRaises(ValueError):
+            check_resource_dict(function=simple_function)
+
+    def test_check_resource_dict_is_empty(self):
+        with self.assertRaises(ValueError):
+            check_resource_dict_is_empty(resource_dict={"a": 1})