diff --git a/tests-old/unit-tests/tasks/__init__.py b/tests-old/unit-tests/tasks/__init__.py
deleted file mode 100644
index e69de29b..00000000
diff --git a/tests-old/unit-tests/tasks/common_test.py b/tests-old/unit-tests/tasks/common_test.py
deleted file mode 100644
index 1ab27b9e..00000000
--- a/tests-old/unit-tests/tasks/common_test.py
+++ /dev/null
@@ -1,58 +0,0 @@
-##############################################################################
-# (c) Crown copyright Met Office. All rights reserved.
-# For further details please refer to the file COPYRIGHT
-# which you should have received as part of this distribution
-##############################################################################
-from pathlib import Path
-from textwrap import dedent
-
-from fab.tasks.common import Linker, HeaderAnalyser
-from fab.artifact import \
-    Artifact, \
-    New, \
-    Unknown, \
-    Executable, \
-    Linked, \
-    HeadersAnalysed
-
-
-class TestLinker:
-    def test_run(self, mocker, tmp_path: Path):
-        # Instantiate Linker
-        workspace = Path(tmp_path)
-        linker = Linker('foo',
-                        ['--bar', '--baz'],
-                        workspace,
-                        'qux')
-
-        # Create artifacts (object files for linking)
-        file1 = '/path/to/file.1'
-        file2 = '/path/to/file.2'
-        artifacts = [Artifact(Path(file1),
-                              Unknown,
-                              New),
-                     Artifact(Path(file2),
-                              Unknown,
-                              New)]
-
-        # Monkeypatch the subprocess call out and run linker
-        patched_run = mocker.patch('subprocess.run')
-        artifacts_out = linker.run(artifacts)
-
-        # Check that the subprocess call contained the command
-        # that we would expect based on the above
-        expected_command = ['foo',
-                            '-o',
-                            str(workspace / 'qux'),
-                            file1,
-                            file2,
-                            '--bar',
-                            '--baz']
-        patched_run.assert_called_once_with(expected_command,
-                                            check=True)
-        assert len(artifacts_out) == 1
-        assert artifacts_out[0].location == workspace / 'qux'
-        assert artifacts_out[0].filetype is Executable
-        assert artifacts_out[0].state is Linked
-        assert artifacts_out[0].depends_on == []
-        assert artifacts_out[0].defines == []