diff --git a/junifer/api/cli.py b/junifer/api/cli.py
index a5888ccbd..fb8656dd0 100644
--- a/junifer/api/cli.py
+++ b/junifer/api/cli.py
@@ -5,6 +5,9 @@
 # License: AGPL
 
 import pathlib
+import subprocess
+import sys
+from pathlib import Path
 from typing import Dict, List, Union
 
 import click
@@ -216,3 +219,67 @@ def wtf(long_: bool) -> None:
         "environment": _get_environment_information(long_=long_),
     }
     click.echo(yaml.dump(report, sort_keys=False))
+
+
+@cli.command()
+@click.argument("subpkg", type=str)
+def selftest(subpkg: str) -> None:
+    """Selftest command for CLI.
+
+    Parameters
+    ----------
+    subpkg : {"all", "api", "configs", "data", "datagrabber", "datareader",
+        "markers", "pipeline", "preprocess", "storage", "testing", "utils",
+        "stats"}
+        The sub-package to run tests for.
+
+    Raises
+    ------
+    click.BadArgumentUsage
+        If `subpkg` is invalid.
+
+    """
+    sub_packages = [
+        "all",
+        "api",
+        "configs",
+        "data",
+        "datagrabber",
+        "datareader",
+        "markers",
+        "pipeline",
+        "preprocess",
+        "storage",
+        "testing",
+        "tests",
+        "utils",
+    ]
+    if subpkg not in sub_packages:
+        raise click.BadArgumentUsage(
+            f"Invalid value for argument `subpkg`: {subpkg}. "
+            f"Should be one of {sub_packages}"
+        )
+
+    if subpkg == "all":
+        completed_process = subprocess.run(
+            ["pytest", "-vvv"],
+            stdin=subprocess.DEVNULL,
+            stdout=sys.stdout,
+            stderr=subprocess.STDOUT,
+            cwd=Path(__file__).parent.parent.parent.absolute(),
+            check=False,
+        )
+    else:
+        completed_process = subprocess.run(
+            ["pytest", f"junifer/{subpkg}", "-vvv"],
+            stdin=subprocess.DEVNULL,
+            stdout=sys.stdout,
+            stderr=subprocess.STDOUT,
+            cwd=Path(__file__).parent.parent.parent.absolute(),
+            check=False,
+        )
+
+    if completed_process.returncode == 0:
+        click.secho("Successful.", fg="green")
+    else:
+        click.secho("Failure.", fg="red")
diff --git a/junifer/api/tests/test_cli.py b/junifer/api/tests/test_cli.py
index e2259c581..8e90dc765 100644
--- a/junifer/api/tests/test_cli.py
+++ b/junifer/api/tests/test_cli.py
@@ -11,7 +11,7 @@ import pytest
 import yaml
 from click.testing import CliRunner
 
-from junifer.api.cli import collect, run, wtf
+from junifer.api.cli import collect, run, selftest, wtf
 
 
 # Create click test runner
@@ -84,3 +84,19 @@ def test_wtf_long() -> None:
     wtf_result = runner.invoke(wtf, "--long")
     # Check
     assert wtf_result.exit_code == 0
+
+
+def test_selftest_invalid_arg() -> None:
+    """Test selftest failure for invalid argument value."""
+    # Invoke selftest command
+    selftest_result = runner.invoke(selftest, "abyss")
+    # Check
+    assert selftest_result.exit_code == 2
+
+
+def test_selftest() -> None:
+    """Test selftest."""
+    # Invoke selftest command
+    selftest_result = runner.invoke(selftest, "tests")
+    # Check; will result in 1 due to I/O descriptor manipulation
+    assert selftest_result.exit_code == 1