feat: Add crew train cli (#624)

* fix: fix crewai-tools cli command

* feat: add crewai train CLI command

* feat: add the tests

* fix: fix typing hinting issue on code

* fix: test.yml

* fix: fix test

* fix: removed fix since it didnt changed the test

tests/cli/train_crew_test.py

@@ -0,0 +1,87 @@
+import subprocess
+from unittest import mock
+
+from crewai.cli.train_crew import train_crew
+
+
+@mock.patch("crewai.cli.train_crew.subprocess.run")
+def test_train_crew_positive_iterations(mock_subprocess_run):
+    # Arrange
+    n_iterations = 5
+    mock_subprocess_run.return_value = subprocess.CompletedProcess(
+        args=["poetry", "run", "train", str(n_iterations)],
+        returncode=0,
+        stdout="Success",
+        stderr="",
+    )
+
+    # Act
+    train_crew(n_iterations)
+
+    # Assert
+    mock_subprocess_run.assert_called_once_with(
+        ["poetry", "run", "train", str(n_iterations)],
+        capture_output=False,
+        text=True,
+        check=True,
+    )
+
+
+@mock.patch("crewai.cli.train_crew.click")
+def test_train_crew_zero_iterations(click):
+    train_crew(0)
+    click.echo.assert_called_once_with(
+        "An unexpected error occurred: The number of iterations must be a positive integer.",
+        err=True,
+    )
+
+
+@mock.patch("crewai.cli.train_crew.click")
+def test_train_crew_negative_iterations(click):
+    train_crew(-2)
+    click.echo.assert_called_once_with(
+        "An unexpected error occurred: The number of iterations must be a positive integer.",
+        err=True,
+    )
+
+
+@mock.patch("crewai.cli.train_crew.click")
+@mock.patch("crewai.cli.train_crew.subprocess.run")
+def test_train_crew_called_process_error(mock_subprocess_run, click):
+    n_iterations = 5
+    mock_subprocess_run.side_effect = subprocess.CalledProcessError(
+        returncode=1,
+        cmd=["poetry", "run", "train", str(n_iterations)],
+        output="Error",
+        stderr="Some error occurred",
+    )
+    train_crew(n_iterations)
+
+    mock_subprocess_run.assert_called_once_with(
+        ["poetry", "run", "train", "5"], capture_output=False, text=True, check=True
+    )
+    click.echo.assert_has_calls(
+        [
+            mock.call.echo(
+                "An error occurred while training the crew: Command '['poetry', 'run', 'train', '5']' returned non-zero exit status 1.",
+                err=True,
+            ),
+            mock.call.echo("Error", err=True),
+        ]
+    )
+
+
+@mock.patch("crewai.cli.train_crew.click")
+@mock.patch("crewai.cli.train_crew.subprocess.run")
+def test_train_crew_unexpected_exception(mock_subprocess_run, click):
+    # Arrange
+    n_iterations = 5
+    mock_subprocess_run.side_effect = Exception("Unexpected error")
+    train_crew(n_iterations)
+
+    mock_subprocess_run.assert_called_once_with(
+        ["poetry", "run", "train", "5"], capture_output=False, text=True, check=True
+    )
+    click.echo.assert_called_once_with(
+        "An unexpected error occurred: Unexpected error", err=True
+    )