Add .tests.report.legacy.test_iamc_report_hackathon

Copied from iiasa/message_data branch `dev`.

Author: khaeru

message_ix_models/tests/report/legacy/test_iamc_report_hackathon.py

@@ -0,0 +1,33 @@
+import pytest
+from message_ix_models import testing
+from message_ix_models.util import MESSAGE_DATA_PATH
+
+from message_data.tools.post_processing import iamc_report_hackathon
+
+
+@pytest.mark.parametrize("set_out_dir", [False, True])
+def test_report(caplog, request, test_context, set_out_dir):
+    """Invoke :func:`.iamc_report_hackathon.report` directly."""
+    # Mandatory arguments to report(): a scenario and its platform
+    scenario = testing.bare_res(request, test_context, solved=False)
+
+    # Set dry_run = True to not actually perform any calculations or modifications
+    test_context.dry_run = True
+
+    if set_out_dir:
+        expected = test_context.get_local_path("report", "foo")
+        args = dict(out_dir=expected)
+    else:
+        # Do not provide out_dir/no arguments
+        args = dict()
+        expected = MESSAGE_DATA_PATH.joinpath("reporting_output")
+
+    # Call succeeds
+    iamc_report_hackathon.report(
+        scenario.platform, scenario, context=test_context, **args
+    )
+
+    # Dry-run message is logged
+    assert "DRY RUN" in caplog.messages[-1]
+    # Output directory is set
+    assert caplog.messages[-1].endswith(str(expected))