diff --git a/tlc/tests/conftest.py b/tlc/tests/conftest.py
new file mode 100644
index 0000000..93e44a9
--- /dev/null
+++ b/tlc/tests/conftest.py
@@ -0,0 +1,95 @@
+#!/usr/bin/env python3
+# type: ignore[attr-defined]
+
+#
+# Copyright (c) 2024, Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+""" Common configurations and fixtures for test environment."""
+
+from random import randint
+
+import pytest
+import yaml
+from click.testing import CliRunner
+
+from tlc.cli import cli
+
+
+def generate_random_bytes(n):
+    return bytes([randint(0, 255) for _ in range(n)])
+
+
+@pytest.fixture
+def tmptlstr(tmpdir):
+    return tmpdir.join("tl.bin").strpath
+
+
+@pytest.fixture
+def tmpyamlconfig(tmpdir):
+    return tmpdir.join("config.yaml").strpath
+
+
+@pytest.fixture
+def tmpfdt(tmpdir):
+    fdt = tmpdir.join("fdt.dtb")
+    fdt.write_binary(b"\x00" * 100)
+    return fdt
+
+
+@pytest.fixture(params=[1, 2, 3, 4, 5, 0x100, 0x101, 0x102, 0x104])
+def non_empty_tag_id(request):
+    return request.param
+
+
+@pytest.fixture
+def tmpyamlconfig_blob_file(tmpdir, tmpfdt, non_empty_tag_id):
+    config_path = tmpdir.join("config.yaml")
+
+    config = {
+        "has_checksum": True,
+        "max_size": 0x1000,
+        "entries": [
+            {
+                "tag_id": non_empty_tag_id,
+                "blob_file_path": tmpfdt.strpath,
+            },
+        ],
+    }
+
+    with open(config_path, "w") as f:
+        yaml.safe_dump(config, f)
+
+    return config_path
+
+
+@pytest.fixture
+def tlcrunner(tmptlstr):
+    runner = CliRunner()
+    with runner.isolated_filesystem():
+        runner.invoke(cli, ["create", "--size", 0x1F000, tmptlstr])
+    return runner
+
+
+@pytest.fixture
+def tlc_entries(tmpfdt):
+    return [(0, "/dev/null"), (1, tmpfdt.strpath), (0x102, tmpfdt.strpath)]
+
+
+@pytest.fixture
+def random_entry():
+    def _random_entry(max_size):
+        return randint(0, 0xFFFFFF), generate_random_bytes(randint(0, max_size))
+
+    return _random_entry
+
+
+@pytest.fixture
+def random_entries(random_entry):
+    def _random_entries(n=5, max_size=0x100):
+        for _ in range(n):
+            yield random_entry(max_size)
+
+    return _random_entries