diff --git a/tests/test_pe_helper.py b/tests/test_pe_helper.py
new file mode 100644
index 0000000..4d6f746
--- /dev/null
+++ b/tests/test_pe_helper.py
@@ -0,0 +1,80 @@
+
+
+import pytest
+from simplezfs.pe_helper import ExternalPEHelper, PEHelperBase, SudoPEHelper
+
+
+class TestPEHelperBase:
+
+    def test_repr(self):
+        pehb = PEHelperBase()
+        assert 'PEHelperBase' in str(pehb)
+
+    def test_not_implemented(self):
+        pehb = PEHelperBase()
+
+        with pytest.raises(NotImplementedError):
+            pehb.zfs_mount('test')
+        with pytest.raises(NotImplementedError):
+            pehb.zfs_set_mountpoint('test', '/test')
+
+
+class TestExternalPEHelper:
+
+    def test_repr(self):
+        eph = ExternalPEHelper('/bin/true')
+        assert 'ExternalPEHelper' in str(eph)
+        assert '/bin/true' in str(eph)
+
+    # ########################################################################
+    def test_get_executable(self):
+        eph = ExternalPEHelper('/bin/true')
+        assert eph.executable == '/bin/true'
+
+    def test_set_executable(self):
+        eph = ExternalPEHelper('/bin/false')
+        assert eph.executable == '/bin/false'
+
+        eph.executable = '/bin/true'
+        assert eph.executable == '/bin/true'
+
+    def test_set_executable_not_found_ctor(self):
+        with pytest.raises(FileNotFoundError) as e:
+            ExternalPEHelper('/file/does/not/exist')
+        assert 'No such file or directory' in str(e.value)
+
+    def test_set_executable_not_found_property(self):
+        eph = ExternalPEHelper('/bin/true')
+        with pytest.raises(FileNotFoundError) as e:
+            eph.executable = '/file/does/not/exist'
+        assert 'No such file or directory' in str(e.value)
+
+    def test_set_executable_directory_ctor(self):
+        with pytest.raises(FileNotFoundError) as e:
+            ExternalPEHelper('/')
+        assert 'must be a file' in str(e.value)
+
+    def test_set_executable_directory_property(self):
+        eph = ExternalPEHelper('/bin/true')
+        with pytest.raises(FileNotFoundError) as e:
+            eph.executable = '/'
+        assert 'must be a file' in str(e.value)
+
+    def test_set_executable_nonexecutable_ctor(self):
+        with pytest.raises(FileNotFoundError) as e:
+            ExternalPEHelper('/etc/hosts')
+        assert 'must be executable' in str(e.value)
+
+    def test_set_executable_nonexecutable_property(self):
+        eph = ExternalPEHelper('/bin/true')
+        with pytest.raises(FileNotFoundError) as e:
+            eph.executable = '/etc/hosts'
+        assert 'must be executable' in str(e.value)
+
+
+class TestSudoPEHelper:
+
+    def test_repr(self):
+        sph = SudoPEHelper()
+        assert 'SudoPEHelper' in str(sph)
+        assert 'sudo' in str(sph)
diff --git a/tests/test_zfs.py b/tests/test_zfs.py
index b4abccf..710bd76 100644
--- a/tests/test_zfs.py
+++ b/tests/test_zfs.py
@@ -7,6 +7,7 @@ from unittest.mock import patch
 import pytest  # type: ignore
 
 from simplezfs.exceptions import ValidationError
+from simplezfs.pe_helper import PEHelperBase
 from simplezfs.types import Dataset, DatasetType
 from simplezfs.zfs import ZFS, get_zfs
 from simplezfs.zfs_cli import ZFSCli
@@ -29,6 +30,19 @@ class TestZFS:
 
     ##########################################################################
 
+    def test_get_pe_helper_default(self):
+        zfs = ZFS()
+        assert zfs.pe_helper is None
+
+    def test_get_pe_helper_set_valid(self):
+        zfs = ZFS()
+        assert zfs.pe_helper is None
+        zfs.pe_helper = PEHelperBase()
+        assert zfs.pe_helper is not None
+        assert isinstance(zfs.pe_helper, PEHelperBase)
+
+    ##########################################################################
+
     def test_get_property_notimplemented(self):
         zfs = ZFS()
         with pytest.raises(NotImplementedError):