Add E2E testing

tests/test_cij_cli_run.py

@@ -0,0 +1,22 @@
+import pytest
+from pathlib import Path
+from os import getcwd, chdir
+
+settings = [
+    "examples/diopside/settings.yaml",
+    "examples/bridgmanite/settings.yaml",
+    "examples/akimotoite/settings.yaml",
+]
+
+@pytest.mark.parametrize("settings", settings)
+def test_cij_run_with_example(cli_runner, settings):
+    import cij.cli.main
+    settings = Path(settings)
+    working_dir = str(settings.parent)
+    settings_fname = settings.name
+    cwd = getcwd()
+    chdir(working_dir)
+    result = cli_runner.invoke(cij.cli.main.main, [settings_fname])
+    chdir(cwd)
+
+    assert result.exit_code == 0