test: add tests for cmd.run and cmd.run_interactive

Author: PhilipNelson5

tests/test_cmd.py

@@ -57,39 +57,129 @@ def decode(self, encoding="utf-8", errors="strict"):
         cmd._try_decode(_bytes())
 
 
-def test_run_returns_command_with_shell_false():
-    """Test that cmd.run executes a list-based command without shell."""
-    c = cmd.run(["python", "-c", "print('hello')"])
-    assert c.return_code == 0
-    assert "hello" in c.out
-
-
-def test_run_shell_returns_command_with_shell_true():
-    """Test that cmd.run_shell executes a string command via the shell."""
-    c = cmd.run_shell("python -c \"print('hello')\"")
-    assert c.return_code == 0
-    assert "hello" in c.out
-
-
-def test_run_with_env():
-    """Test that cmd.run passes extra environment variables."""
-    c = cmd.run(
-        ["python", "-c", "import os; print(os.environ['CZ_TEST_VAR'])"],
-        env={"CZ_TEST_VAR": "test_value"},
-    )
-    assert c.return_code == 0
-    assert "test_value" in c.out
-
-
-def test_run_with_string_emits_deprecation_warning():
-    """Test that passing a string to cmd.run() emits a DeprecationWarning."""
-    import warnings
-
-    with warnings.catch_warnings(record=True) as w:
-        warnings.simplefilter("always")
-        c = cmd.run("python -c \"print('deprecated')\"")
+class TestRun:
+    def test_returns_command_with_shell_false(self):
+        """Test that cmd.run executes a list-based command without shell."""
+        c = cmd.run(["python", "-c", "print('hello')"])
+        assert c.return_code == 0
+        assert "hello" in c.out
+
+    def test_with_env(self):
+        """Test that cmd.run passes extra environment variables."""
+        c = cmd.run(
+            ["python", "-c", "import os; print(os.environ['CZ_TEST_VAR'])"],
+            env={"CZ_TEST_VAR": "test_value"},
+        )
+        assert c.return_code == 0
+        assert "test_value" in c.out
+
+    def test_with_string_emits_deprecation_warning(self):
+        """Test that passing a string to cmd.run() emits a DeprecationWarning."""
+        import warnings
+
+        with warnings.catch_warnings(record=True) as w:
+            warnings.simplefilter("always")
+            c = cmd.run("python -c \"print('deprecated')\"")
+            assert c.return_code == 0
+            assert "deprecated" in c.out
+            assert len(w) == 1
+            assert issubclass(w[0].category, DeprecationWarning)
+            assert "cmd.run()" in str(w[0].message)
+
+    def test_stdout_captured(self):
+        result = cmd.run(["python", "-c", "print('hello')"])
+        assert "hello" in result.out
+        assert isinstance(result.stdout, bytes)
+        assert b"hello" in result.stdout
+
+    def test_stderr_captured(self):
+        result = cmd.run(
+            ["python", "-c", "import sys; print('err msg', file=sys.stderr)"]
+        )
+        assert "err msg" in result.err
+        assert isinstance(result.stderr, bytes)
+        assert b"err msg" in result.stderr
+
+    def test_zero_return_code_on_success(self):
+        result = cmd.run(["python", "-c", "import sys; sys.exit(0)"])
+        assert result.return_code == 0
+
+    def test_nonzero_return_code_on_failure(self):
+        result = cmd.run(["python", "-c", "import sys; sys.exit(42)"])
+        assert result.return_code == 42
+
+    def test_env_passed_to_subprocess(self):
+        result = cmd.run(
+            ["python", "-c", "import os; print(os.environ['CZ_TEST_VAR'])"],
+            env={"CZ_TEST_VAR": "sentinelvalue"},
+        )
+        assert "sentinelvalue" in result.out
+        assert result.return_code == 0
+
+    def test_env_merged_with_os_environ(self, monkeypatch):
+        monkeypatch.setenv("CZ_EXISTING_VAR", "fromenv")
+        result = cmd.run(
+            ["python", "-c", "import os; print(os.environ['CZ_EXISTING_VAR'])"],
+            env={"CZ_EXTRA_VAR": "extra"},
+        )
+        assert "fromenv" in result.out
+
+    def test_empty_stdout_and_stderr(self):
+        result = cmd.run(["python", "-c", '"pass"'])
+        assert result.out == ""
+        assert result.err == ""
+        assert result.stdout == b""
+        assert result.stderr == b""
+
+    def test_no_env_uses_os_environ(self, monkeypatch):
+        monkeypatch.setenv("CZ_NO_ENV_TEST", "inherited")
+        result = cmd.run(
+            ["python", "-c", "import os; print(os.environ['CZ_NO_ENV_TEST'])"]
+        )
+        assert "inherited" in result.out
+
+
+class TestRunShell:
+    def test_returns_command_with_shell_true(self):
+        """Test that cmd.run_shell executes a string command via the shell."""
+        c = cmd.run_shell("python -c \"print('hello')\"")
         assert c.return_code == 0
-        assert "deprecated" in c.out
-        assert len(w) == 1
-        assert issubclass(w[0].category, DeprecationWarning)
-        assert "cmd.run()" in str(w[0].message)
+        assert "hello" in c.out
+
+
+class TestRunInteractive:
+    def test_zero_return_code_on_success(self):
+        return_code = cmd.run_interactive(["python", "-c", "import sys; sys.exit(0)"])
+        assert return_code == 0
+
+    def test_nonzero_return_code_on_failure(self):
+        return_code = cmd.run_interactive(["python", "-c", "import sys; sys.exit(3)"])
+        assert return_code == 3
+
+    def test_env_passed_to_subprocess(self):
+        return_code = cmd.run_interactive(
+            [
+                "python",
+                "-c",
+                "import os, sys; sys.exit(0 if os.environ['CZ_ITEST_VAR'] == 'val' else 1)",
+            ],
+            env={"CZ_ITEST_VAR": "val"},
+        )
+        assert return_code == 0
+
+    def test_env_merged_with_os_environ(self, monkeypatch):
+        monkeypatch.setenv("CZ_ITEST_EXISTING", "yes")
+        return_code = cmd.run_interactive(
+            [
+                "python",
+                "-c",
+                "import os, sys; sys.exit(0 if os.environ['CZ_ITEST_EXISTING'] == 'yes' else 1)",
+            ],
+            env={"CZ_ITEST_EXTRA": "extra"},
+        )
+        assert return_code == 0
+
+    def test_runs_with_string(self):
+        """Test that cmd.run_shell executes a string command via the shell."""
+        return_code = cmd.run_interactive("python -c \"print('hello')\"")
+        assert return_code == 0