diff --git a/scripts/tests/conftest.py b/scripts/tests/conftest.py
new file mode 100644
index 0000000..797bf25
--- /dev/null
+++ b/scripts/tests/conftest.py
@@ -0,0 +1,31 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import pytest
+
+# List of tests expected to fail for some reason
+XFAILED_TESTS = {
+    "tests/test_keys.py::test_getpriv[openssl-ed25519]",
+    "tests/test_keys.py::test_getpriv[openssl-x25519]",
+    "tests/test_keys.py::test_getpriv[pkcs8-rsa-2048]",
+    "tests/test_keys.py::test_getpriv[pkcs8-rsa-3072]",
+    "tests/test_keys.py::test_getpriv[pkcs8-ed25519]",
+    "tests/test_keys.py::test_getpub[pem-ed25519]",
+    "tests/test_keys.py::test_sign_verify[x25519]",
+}
+
+
+def pytest_runtest_setup(item):
+    if item.nodeid in XFAILED_TESTS:
+        pytest.xfail()
diff --git a/scripts/tests/test_commands.py b/scripts/tests/test_commands.py
new file mode 100644
index 0000000..458e4e2
--- /dev/null
+++ b/scripts/tests/test_commands.py
@@ -0,0 +1,112 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import pytest
+
+from click.testing import CliRunner
+from imgtool.main import imgtool
+from imgtool import imgtool_version
+
+# all available imgtool commands
+COMMANDS = [
+    "create",
+    "dumpinfo",
+    "getpriv",
+    "getpub",
+    "getpubhash",
+    "keygen",
+    "sign",
+    "verify",
+    "version",
+]
+
+
+def test_new_command():
+    """Check that no new commands had been added,
+    so that tests would be updated in such case"""
+    for cmd in imgtool.commands:
+        assert cmd in COMMANDS
+
+
+def test_help():
+    """Simple test for the imgtool's help option,
+    mostly just to see that it can be started"""
+    runner = CliRunner()
+
+    result_short = runner.invoke(imgtool, ["-h"])
+    assert result_short.exit_code == 0
+
+    result_long = runner.invoke(imgtool, ["--help"])
+    assert result_long.exit_code == 0
+    assert result_short.output == result_long.output
+
+    # by default help should be also produced
+    result_empty = runner.invoke(imgtool)
+    assert result_empty.exit_code == 0
+    assert result_empty.output == result_short.output
+
+
+def test_version():
+    """Check that some version info is produced"""
+    runner = CliRunner()
+
+    result = runner.invoke(imgtool, ["version"])
+    assert result.exit_code == 0
+    assert result.output == imgtool_version + "\n"
+
+    result_help = runner.invoke(imgtool, ["version", "-h"])
+    assert result_help.exit_code == 0
+    assert result_help.output != result.output
+
+
+def test_unknown():
+    """Check that unknown command will be handled"""
+    runner = CliRunner()
+
+    result = runner.invoke(imgtool, ["unknown"])
+    assert result.exit_code != 0
+
+
+@pytest.mark.parametrize("command", COMMANDS)
+def test_cmd_help(command):
+    """Check that all commands have some help"""
+    runner = CliRunner()
+
+    result_short = runner.invoke(imgtool, [command, "-h"])
+    assert result_short.exit_code == 0
+
+    result_long = runner.invoke(imgtool, [command, "--help"])
+    assert result_long.exit_code == 0
+
+    assert result_short.output == result_long.output
+
+
+@pytest.mark.parametrize("command1", COMMANDS)
+@pytest.mark.parametrize("command2", COMMANDS)
+def test_cmd_dif_help(command1, command2):
+    """Check that all commands have some different help"""
+    runner = CliRunner()
+
+    result_general = runner.invoke(imgtool, "--help")
+    assert result_general.exit_code == 0
+
+    result_cmd1 = runner.invoke(imgtool, [command1, "--help"])
+    assert result_cmd1.exit_code == 0
+    assert result_cmd1.output != result_general.output
+
+    if command1 != command2:
+        result_cmd2 = runner.invoke(imgtool, [command2, "--help"])
+        assert result_cmd2.exit_code == 0
+
+        assert result_cmd1.output != result_cmd2.output
diff --git a/scripts/tests/test_keys.py b/scripts/tests/test_keys.py
new file mode 100644
index 0000000..a812ba2
--- /dev/null
+++ b/scripts/tests/test_keys.py
@@ -0,0 +1,253 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import pytest
+
+import subprocess
+from click.testing import CliRunner
+from imgtool import main as imgtool_main
+from imgtool.main import imgtool
+
+# all supported key types for 'keygen'
+KEY_TYPES = [*imgtool_main.keygens]
+KEY_ENCODINGS = [*imgtool_main.valid_encodings]
+PUB_HASH_ENCODINGS = [*imgtool_main.valid_hash_encodings]
+PVT_KEY_FORMATS = [*imgtool_main.valid_formats]
+
+OPENSSL_KEY_TYPES = {
+    "rsa-2048": "Private-Key: (2048 bit, 2 primes)",
+    "rsa-3072": "Private-Key: (3072 bit, 2 primes)",
+    "ecdsa-p256": "Private-Key: (256 bit)",
+    "ecdsa-p384": "Private-Key: (384 bit)",
+    "ed25519": "ED25519 Private-Key:",
+    "x25519": "X25519 Private-Key:",
+}
+
+GEN_KEY_EXT = ".key"
+GEN_ANOTHER_KEY_EXT = ".another.key"
+PUB_KEY_EXT = ".pub"
+PUB_KEY_HASH_EXT = ".pubhash"
+
+
+def tmp_name(tmp_path, key_type, suffix=""):
+    return tmp_path / (key_type + suffix)
+
+
+@pytest.fixture(scope="session")
+def tmp_path_persistent(tmp_path_factory):
+    return tmp_path_factory.mktemp("keys")
+
+
+@pytest.mark.parametrize("key_type", KEY_TYPES)
+def test_keygen(key_type, tmp_path_persistent):
+    """Generate keys by imgtool"""
+
+    runner = CliRunner()
+
+    gen_key = tmp_name(tmp_path_persistent, key_type, GEN_KEY_EXT)
+
+    assert not gen_key.exists()
+    result = runner.invoke(
+        imgtool, ["keygen", "--key", str(gen_key), "--type", key_type]
+    )
+    assert result.exit_code == 0
+    assert gen_key.exists()
+    assert gen_key.stat().st_size > 0
+
+    # another key
+    gen_key2 = tmp_name(tmp_path_persistent, key_type, GEN_ANOTHER_KEY_EXT)
+
+    assert str(gen_key2) != str(gen_key)
+
+    assert not gen_key2.exists()
+    result = runner.invoke(
+        imgtool, ["keygen", "--key", str(gen_key2), "--type", key_type]
+    )
+    assert result.exit_code == 0
+    assert gen_key2.exists()
+    assert gen_key2.stat().st_size > 0
+
+    # content must be different
+    assert gen_key.read_bytes() != gen_key2.read_bytes()
+
+
+@pytest.mark.parametrize("key_type", KEY_TYPES)
+def test_keygen_type(key_type, tmp_path_persistent):
+    """Check generated keys"""
+    assert key_type in OPENSSL_KEY_TYPES
+
+    gen_key = tmp_name(tmp_path_persistent, key_type, GEN_KEY_EXT)
+
+    result = subprocess.run(
+        ["openssl", "pkey", "-in", str(gen_key), "-check", "-noout", "-text"],
+        capture_output=True,
+        text=True,
+    )
+    assert result.returncode == 0
+    assert "Key is valid" in result.stdout
+    assert OPENSSL_KEY_TYPES[key_type] in result.stdout
+
+
+@pytest.mark.parametrize("key_type", KEY_TYPES)
+@pytest.mark.parametrize("format", PVT_KEY_FORMATS)
+def test_getpriv(key_type, format, tmp_path_persistent):
+    """Get private key"""
+    runner = CliRunner()
+
+    gen_key = tmp_name(tmp_path_persistent, key_type, GEN_KEY_EXT)
+
+    result = runner.invoke(
+        imgtool,
+        [
+            "getpriv",
+            "--key",
+            str(gen_key),
+            "--format",
+            format,
+        ],
+    )
+    assert result.exit_code == 0
+
+
+@pytest.mark.parametrize("key_type", KEY_TYPES)
+@pytest.mark.parametrize("encoding", KEY_ENCODINGS)
+def test_getpub(key_type, encoding, tmp_path_persistent):
+    """Get public key"""
+    runner = CliRunner()
+
+    gen_key = tmp_name(tmp_path_persistent, key_type, GEN_KEY_EXT)
+    pub_key = tmp_name(tmp_path_persistent, key_type, PUB_KEY_EXT
+                       + "." + encoding)
+
+    assert not pub_key.exists()
+    result = runner.invoke(
+        imgtool,
+        [
+            "getpub",
+            "--key",
+            str(gen_key),
+            "--output",
+            str(pub_key),
+            "--encoding",
+            encoding,
+        ],
+    )
+    assert result.exit_code == 0
+    assert pub_key.exists()
+    assert pub_key.stat().st_size > 0
+
+
+@pytest.mark.parametrize("key_type", KEY_TYPES)
+@pytest.mark.parametrize("encoding", PUB_HASH_ENCODINGS)
+def test_getpubhash(key_type, encoding, tmp_path_persistent):
+    """Get the hash of the public key"""
+    runner = CliRunner()
+
+    gen_key = tmp_name(tmp_path_persistent, key_type, GEN_KEY_EXT)
+    pub_key_hash = tmp_name(
+        tmp_path_persistent, key_type, PUB_KEY_HASH_EXT + "." + encoding
+    )
+
+    assert not pub_key_hash.exists()
+    result = runner.invoke(
+        imgtool,
+        [
+            "getpubhash",
+            "--key",
+            str(gen_key),
+            "--output",
+            str(pub_key_hash),
+            "--encoding",
+            encoding,
+        ],
+    )
+    assert result.exit_code == 0
+    assert pub_key_hash.exists()
+    assert pub_key_hash.stat().st_size > 0
+
+
+@pytest.mark.parametrize("key_type", KEY_TYPES)
+def test_sign_verify(key_type, tmp_path_persistent):
+    """Test basic sign and verify"""
+    runner = CliRunner()
+
+    gen_key = tmp_name(tmp_path_persistent, key_type, GEN_KEY_EXT)
+    wrong_key = tmp_name(tmp_path_persistent, key_type, GEN_ANOTHER_KEY_EXT)
+    image = tmp_name(tmp_path_persistent, "image", "bin")
+    image_signed = tmp_name(tmp_path_persistent, "image", "signed")
+
+    with image.open("wb") as f:
+        f.write(b"\x00" * 1024)
+
+    # not all required arguments are provided
+    result = runner.invoke(
+        imgtool,
+        [
+            "sign",
+            "--key",
+            str(gen_key),
+            str(image),
+            str(image_signed),
+        ],
+    )
+    assert result.exit_code != 0
+    assert not image_signed.exists()
+
+    result = runner.invoke(
+        imgtool,
+        [
+            "sign",
+            "--key",
+            str(gen_key),
+            "--align",
+            "16",
+            "--version",
+            "1.0.0",
+            "--header-size",
+            "0x400",
+            "--slot-size",
+            "0x10000",
+            "--pad-header",
+            str(image),
+            str(image_signed),
+        ],
+    )
+    assert result.exit_code == 0
+    assert image_signed.exists()
+    assert image_signed.stat().st_size > 0
+
+    # original key can be used to verify a signed image
+    result = runner.invoke(
+        imgtool,
+        [
+            "verify",
+            "--key",
+            str(gen_key),
+            str(image_signed),
+        ],
+    )
+    assert result.exit_code == 0
+
+    # 'another' key is not valid to verify a signed image
+    result = runner.invoke(
+        imgtool,
+        [
+            "verify",
+            "--key",
+            str(wrong_key),
+            str(image_signed),
+        ],
+    )
+    assert result.exit_code != 0
+    image_signed.unlink()