test(commands/changelog): add test case for changelog command

Author: Lee-W

tests/commands/test_changelog_command.py

@@ -0,0 +1,65 @@
+import sys
+
+import pytest
+
+from commitizen import cli
+from tests.utils import create_file_and_commit
+
+
+@pytest.mark.usefixtures("tmp_commitizen_project")
+def test_changlog_on_empty_project(mocker):
+    testargs = ["cz", "changelog", "--dry-run"]
+    mocker.patch.object(sys, "argv", testargs)
+
+    with pytest.raises(SystemExit):
+        cli.main()
+
+
+@pytest.mark.usefixtures("tmp_commitizen_project")
+def test_changlog_from_start(mocker, capsys):
+    create_file_and_commit("feat: new file")
+    create_file_and_commit("refactor: not in changelog")
+    create_file_and_commit("Merge into master")
+
+    testargs = ["cz", "changelog", "--dry-run"]
+    mocker.patch.object(sys, "argv", testargs)
+
+    with pytest.raises(SystemExit):
+        cli.main()
+
+    out, _ = capsys.readouterr()
+    assert out == "# CHANGELOG\n\n## Unreleased\n### feat\n- new file\n\n\n"
+
+
+@pytest.mark.usefixtures("tmp_commitizen_project")
+def test_changlog_from_version_zero_point_two(mocker, capsys):
+    create_file_and_commit("feat: new file")
+    create_file_and_commit("refactor: not in changelog")
+
+    # create tag
+    testargs = ["cz", "bump", "--yes"]
+    mocker.patch.object(sys, "argv", testargs)
+    cli.main()
+    capsys.readouterr()
+
+    create_file_and_commit("feat: after 0.2.0")
+    create_file_and_commit("feat: after 0.2")
+
+    testargs = ["cz", "changelog", "--start-rev", "0.2.0", "--dry-run"]
+    mocker.patch.object(sys, "argv", testargs)
+    with pytest.raises(SystemExit):
+        cli.main()
+
+    out, _ = capsys.readouterr()
+    assert out == "# CHANGELOG\n\n## Unreleased\n### feat\n- after 0.2\n- after 0.2.0\n\n\n"
+
+
+@pytest.mark.usefixtures("tmp_commitizen_project")
+def test_changlog_with_unsupported_cz(mocker, capsys):
+    testargs = ["cz", "-n", "cz_jira", "changelog", "--dry-run"]
+    mocker.patch.object(sys, "argv", testargs)
+
+    with pytest.raises(SystemExit):
+        cli.main()
+    out, err = capsys.readouterr()
+    assert "'cz_jira' rule does not support changelog" in err