diff --git a/data_platform/assets/ml/discord_alerts.py b/data_platform/assets/ml/discord_alerts.py
index 79829ad..bf4cb62 100644
--- a/data_platform/assets/ml/discord_alerts.py
+++ b/data_platform/assets/ml/discord_alerts.py
@@ -118,6 +118,6 @@ def listing_alert(
     return MaterializeResult(
         metadata={
             "notified": sent,
-            "min_elo_threshold": MetadataValue.float(config.min_elo),
+            "min_elo_threshold": MetadataValue.float(float(config.min_elo)),
         }
     )
diff --git a/tests/test_assets_elo.py b/tests/test_assets_elo.py
new file mode 100644
index 0000000..2080869
--- /dev/null
+++ b/tests/test_assets_elo.py
@@ -0,0 +1,87 @@
+"""Tests for ELO rating and comparison assets."""
+
+from unittest.mock import MagicMock, patch
+
+from dagster import build_asset_context
+
+from data_platform.assets.elo.elo import _ensure_schema, elo_comparisons, elo_ratings
+
+
+class TestEnsureSchema:
+    def test_executes_create_schema_sql(self):
+        conn = MagicMock()
+        with patch(
+            "data_platform.assets.elo.elo.render_sql",
+            return_value="CREATE SCHEMA IF NOT EXISTS elo",
+        ):
+            _ensure_schema(conn)
+        conn.execute.assert_called_once()
+
+
+class TestEloRatings:
+    @patch(
+        "data_platform.assets.elo.elo.render_sql",
+        return_value="CREATE TABLE IF NOT EXISTS elo.ratings ()",
+    )
+    def test_creates_table_and_returns_metadata(self, mock_render):
+        postgres = MagicMock()
+        engine = MagicMock()
+        conn = MagicMock()
+        engine.begin.return_value.__enter__ = MagicMock(return_value=conn)
+        engine.begin.return_value.__exit__ = MagicMock(return_value=False)
+        postgres.get_engine.return_value = engine
+
+        context = build_asset_context()
+        result = elo_ratings(context, postgres)
+
+        assert result.metadata["schema"].value == "elo"
+        assert result.metadata["table"].value == "ratings"
+        # Two calls: _ensure_schema + create table
+        assert conn.execute.call_count == 2
+
+    @patch("data_platform.assets.elo.elo.render_sql", return_value="SQL")
+    def test_calls_get_engine(self, mock_render):
+        postgres = MagicMock()
+        engine = MagicMock()
+        conn = MagicMock()
+        engine.begin.return_value.__enter__ = MagicMock(return_value=conn)
+        engine.begin.return_value.__exit__ = MagicMock(return_value=False)
+        postgres.get_engine.return_value = engine
+
+        context = build_asset_context()
+        elo_ratings(context, postgres)
+        postgres.get_engine.assert_called_once()
+
+
+class TestEloComparisons:
+    @patch(
+        "data_platform.assets.elo.elo.render_sql",
+        return_value="CREATE TABLE IF NOT EXISTS elo.comparisons ()",
+    )
+    def test_creates_table_and_returns_metadata(self, mock_render):
+        postgres = MagicMock()
+        engine = MagicMock()
+        conn = MagicMock()
+        engine.begin.return_value.__enter__ = MagicMock(return_value=conn)
+        engine.begin.return_value.__exit__ = MagicMock(return_value=False)
+        postgres.get_engine.return_value = engine
+
+        context = build_asset_context()
+        result = elo_comparisons(context, postgres)
+
+        assert result.metadata["schema"].value == "elo"
+        assert result.metadata["table"].value == "comparisons"
+        assert conn.execute.call_count == 2
+
+    @patch("data_platform.assets.elo.elo.render_sql", return_value="SQL")
+    def test_calls_get_engine(self, mock_render):
+        postgres = MagicMock()
+        engine = MagicMock()
+        conn = MagicMock()
+        engine.begin.return_value.__enter__ = MagicMock(return_value=conn)
+        engine.begin.return_value.__exit__ = MagicMock(return_value=False)
+        postgres.get_engine.return_value = engine
+
+        context = build_asset_context()
+        elo_comparisons(context, postgres)
+        postgres.get_engine.assert_called_once()
diff --git a/tests/test_dagster.py b/tests/test_dagster.py
new file mode 100644
index 0000000..2b805f2
--- /dev/null
+++ b/tests/test_dagster.py
@@ -0,0 +1,121 @@
+"""Generic tests for Dagster definitions — schedules, jobs, and the Definitions object."""
+
+import pytest
+from dagster import DefaultScheduleStatus
+
+from data_platform.jobs import (
+    elementary_refresh_job,
+    funda_ingestion_job,
+    funda_raw_quality_job,
+)
+from data_platform.schedules import (
+    elementary_refresh_schedule,
+    funda_ingestion_schedule,
+    funda_raw_quality_schedule,
+)
+
+ALL_SCHEDULES = [
+    elementary_refresh_schedule,
+    funda_ingestion_schedule,
+    funda_raw_quality_schedule,
+]
+
+ALL_JOBS = [
+    elementary_refresh_job,
+    funda_ingestion_job,
+    funda_raw_quality_job,
+]
+
+
+# ---------------------------------------------------------------------------
+# Generic schedule tests
+# ---------------------------------------------------------------------------
+
+
+class TestSchedulesGeneric:
+    """Property tests that apply to every schedule."""
+
+    @pytest.mark.parametrize("schedule", ALL_SCHEDULES, ids=lambda s: s.name)
+    def test_has_name(self, schedule):
+        assert schedule.name
+
+    @pytest.mark.parametrize("schedule", ALL_SCHEDULES, ids=lambda s: s.name)
+    def test_has_valid_cron(self, schedule):
+        parts = schedule.cron_schedule.split()
+        assert len(parts) == 5, f"Expected 5-part cron, got {schedule.cron_schedule}"
+
+    @pytest.mark.parametrize("schedule", ALL_SCHEDULES, ids=lambda s: s.name)
+    def test_has_job(self, schedule):
+        assert schedule.job is not None or schedule.job_name is not None
+
+    @pytest.mark.parametrize("schedule", ALL_SCHEDULES, ids=lambda s: s.name)
+    def test_default_status_running(self, schedule):
+        assert schedule.default_status == DefaultScheduleStatus.RUNNING
+
+
+# ---------------------------------------------------------------------------
+# Generic job tests
+# ---------------------------------------------------------------------------
+
+
+class TestJobsGeneric:
+    """Property tests that apply to every job."""
+
+    @pytest.mark.parametrize("job", ALL_JOBS, ids=lambda j: j.name)
+    def test_has_name(self, job):
+        assert job.name
+
+    @pytest.mark.parametrize("job", ALL_JOBS, ids=lambda j: j.name)
+    def test_has_description(self, job):
+        assert job.description
+
+
+# ---------------------------------------------------------------------------
+# Schedule-specific tests
+# ---------------------------------------------------------------------------
+
+
+class TestScheduleSpecific:
+    def test_elementary_schedule_daily(self):
+        assert elementary_refresh_schedule.cron_schedule == "0 9 * * *"
+
+    def test_funda_ingestion_every_4_hours(self):
+        assert funda_ingestion_schedule.cron_schedule == "0 */4 * * *"
+
+    def test_funda_quality_daily(self):
+        assert funda_raw_quality_schedule.cron_schedule == "0 8 * * *"
+
+    def test_funda_ingestion_schedule_has_run_config_fn(self):
+        assert funda_ingestion_schedule._run_config_fn is not None
+
+
+# ---------------------------------------------------------------------------
+# Definitions integration test
+# ---------------------------------------------------------------------------
+
+
+class TestDefinitions:
+    def test_definitions_loads(self):
+        from data_platform.definitions import defs
+
+        assert defs is not None
+
+    def test_definitions_has_assets(self):
+        from data_platform.definitions import defs
+
+        repo = defs.get_repository_def()
+        asset_keys = repo.asset_graph.get_all_asset_keys()
+        assert len(asset_keys) > 0
+
+    def test_definitions_has_jobs(self):
+        from data_platform.definitions import defs
+
+        job = defs.resolve_job_def("funda_ingestion")
+        assert job is not None
+
+    def test_definitions_has_resources(self):
+        from data_platform.definitions import defs
+
+        repo = defs.get_repository_def()
+        # Resources are configured but we can verify they're present
+        assert repo is not None
diff --git a/tests/test_ml.py b/tests/test_ml.py
index 7f85cc3..955b980 100644
--- a/tests/test_ml.py
+++ b/tests/test_ml.py
@@ -1,18 +1,24 @@
-"""Tests for ML helper functions — preprocess, _best_run, _build_embed."""
+"""Tests for ML helper functions and asset functions."""
 
 from types import SimpleNamespace
 from unittest.mock import MagicMock, patch
 
+import numpy as np
 import pandas as pd
 import pytest
+from dagster import build_asset_context
 
 from data_platform.assets.ml.elo_model import (
     ALL_FEATURES,
     ENERGY_LABEL_MAP,
+    _cleanup_old_runs,
     preprocess,
 )
-from data_platform.assets.ml.discord_alerts import _build_embed
-from data_platform.assets.ml.elo_inference import _best_run
+from data_platform.assets.ml.discord_alerts import (
+    DiscordNotificationConfig,
+    _build_embed,
+)
+from data_platform.assets.ml.elo_inference import EloInferenceConfig, _best_run
 
 
 # ---------------------------------------------------------------------------
@@ -201,3 +207,381 @@ class TestBuildEmbed:
     def test_color_is_green(self):
         embed = _build_embed(self._make_row())
         assert embed["color"] == 0x00B894
+
+
+# ---------------------------------------------------------------------------
+# _cleanup_old_runs
+# ---------------------------------------------------------------------------
+
+
+class TestCleanupOldRuns:
+    @patch("data_platform.assets.ml.elo_model.mlflow")
+    def test_no_experiment_noop(self, mock_mlflow):
+        client = mock_mlflow.tracking.MlflowClient.return_value
+        client.get_experiment_by_name.return_value = None
+        context = MagicMock()
+        _cleanup_old_runs("nonexistent", context, keep=3)
+        client.delete_run.assert_not_called()
+
+    @patch("data_platform.assets.ml.elo_model.mlflow")
+    def test_fewer_than_keep_noop(self, mock_mlflow):
+        client = mock_mlflow.tracking.MlflowClient.return_value
+        client.get_experiment_by_name.return_value = MagicMock(experiment_id="1")
+        client.search_runs.return_value = [MagicMock(), MagicMock()]
+        context = MagicMock()
+        _cleanup_old_runs("exp", context, keep=3)
+        client.delete_run.assert_not_called()
+
+    @patch("data_platform.assets.ml.elo_model.mlflow")
+    def test_deletes_old_runs(self, mock_mlflow):
+        client = mock_mlflow.tracking.MlflowClient.return_value
+        client.get_experiment_by_name.return_value = MagicMock(experiment_id="1")
+        runs = [MagicMock() for _ in range(5)]
+        for i, run in enumerate(runs):
+            run.info.run_id = f"run_{i}"
+        client.search_runs.return_value = runs
+        context = MagicMock()
+        _cleanup_old_runs("exp", context, keep=2)
+        assert client.delete_run.call_count == 3
+        client.delete_run.assert_any_call("run_2")
+        client.delete_run.assert_any_call("run_3")
+        client.delete_run.assert_any_call("run_4")
+
+    @patch("data_platform.assets.ml.elo_model.mlflow")
+    def test_exactly_keep_noop(self, mock_mlflow):
+        client = mock_mlflow.tracking.MlflowClient.return_value
+        client.get_experiment_by_name.return_value = MagicMock(experiment_id="1")
+        client.search_runs.return_value = [MagicMock(), MagicMock(), MagicMock()]
+        context = MagicMock()
+        _cleanup_old_runs("exp", context, keep=3)
+        client.delete_run.assert_not_called()
+
+
+# ---------------------------------------------------------------------------
+# elo_prediction_model asset
+# ---------------------------------------------------------------------------
+
+
+def _make_training_df(n=20):
+    """Build a small training DataFrame with all required columns."""
+    rng = np.random.default_rng(42)
+    data = {
+        "energy_label": rng.choice(["A", "B", "C", "D"], size=n),
+        "current_price": rng.integers(200_000, 500_000, size=n).astype(float),
+        "living_area": rng.integers(40, 150, size=n).astype(float),
+        "plot_area": rng.integers(0, 300, size=n).astype(float),
+        "bedrooms": rng.integers(1, 5, size=n).astype(float),
+        "rooms": rng.integers(2, 8, size=n).astype(float),
+        "construction_year": rng.integers(1900, 2025, size=n).astype(float),
+        "latitude": rng.uniform(51, 53, size=n),
+        "longitude": rng.uniform(3, 6, size=n),
+        "photo_count": rng.integers(1, 30, size=n).astype(float),
+        "views": rng.integers(10, 500, size=n).astype(float),
+        "saves": rng.integers(0, 50, size=n).astype(float),
+        "price_per_sqm": rng.integers(2000, 6000, size=n).astype(float),
+        "has_garden": rng.choice([True, False, None], size=n),
+        "has_balcony": rng.choice([True, False], size=n),
+        "has_solar_panels": rng.choice([True, False, None], size=n),
+        "has_heat_pump": rng.choice([True, False], size=n),
+        "has_roof_terrace": rng.choice([True, False, None], size=n),
+        "is_energy_efficient": rng.choice([True, False], size=n),
+        "is_monument": rng.choice([True, False], size=n),
+        "elo_rating": rng.uniform(1200, 1800, size=n),
+    }
+    return pd.DataFrame(data)
+
+
+class TestEloPredictionModelAsset:
+    @patch("data_platform.assets.ml.elo_model._cleanup_old_runs")
+    @patch("data_platform.assets.ml.elo_model.mlflow")
+    def test_trains_and_returns_metadata(self, mock_mlflow, mock_cleanup):
+        # Setup MLflow mock
+        mock_run = MagicMock()
+        mock_run.info.run_id = "test-run-123"
+        mock_mlflow.start_run.return_value.__enter__ = MagicMock(return_value=mock_run)
+        mock_mlflow.start_run.return_value.__exit__ = MagicMock(return_value=False)
+
+        # Setup Postgres mock
+        postgres = MagicMock()
+        engine = MagicMock()
+        postgres.get_engine.return_value = engine
+        mlflow_resource = MagicMock()
+        mlflow_resource.get_tracking_uri.return_value = "http://mlflow:5000"
+
+        df = _make_training_df(20)
+        context = build_asset_context()
+
+        from data_platform.assets.ml.elo_model import (
+            EloModelConfig,
+            elo_prediction_model,
+        )
+
+        config = EloModelConfig(n_estimators=10)
+
+        with patch("data_platform.assets.ml.elo_model.pd.read_sql", return_value=df):
+            result = elo_prediction_model(context, config, postgres, mlflow_resource)
+
+        assert result.metadata["mlflow_run_id"].value == "test-run-123"
+        assert "rmse" in result.metadata
+        assert "mae" in result.metadata
+        assert "r2" in result.metadata
+        assert result.metadata["train_rows"] > 0
+        assert result.metadata["test_rows"] > 0
+        mock_cleanup.assert_called_once()
+
+    @patch("data_platform.assets.ml.elo_model.mlflow")
+    def test_raises_with_too_few_rows(self, mock_mlflow):
+        postgres = MagicMock()
+        engine = MagicMock()
+        postgres.get_engine.return_value = engine
+        mlflow_resource = MagicMock()
+        mlflow_resource.get_tracking_uri.return_value = "http://mlflow:5000"
+
+        df = _make_training_df(5)  # fewer than 10
+        context = build_asset_context()
+
+        from data_platform.assets.ml.elo_model import (
+            EloModelConfig,
+            elo_prediction_model,
+        )
+
+        config = EloModelConfig()
+
+        with (
+            patch("data_platform.assets.ml.elo_model.pd.read_sql", return_value=df),
+            pytest.raises(ValueError, match="Not enough rated listings"),
+        ):
+            elo_prediction_model(context, config, postgres, mlflow_resource)
+
+
+# ---------------------------------------------------------------------------
+# elo_inference asset
+# ---------------------------------------------------------------------------
+
+
+class TestEloInferenceAsset:
+    def _make_unscored_df(self, n=5):
+        """Build a DataFrame of unscored listings."""
+        rng = np.random.default_rng(42)
+        data = {
+            "global_id": [f"listing_{i}" for i in range(n)],
+            "energy_label": rng.choice(["A", "B", "C"], size=n),
+            "current_price": rng.integers(200_000, 500_000, size=n).astype(float),
+            "living_area": rng.integers(40, 150, size=n).astype(float),
+            "plot_area": rng.integers(0, 300, size=n).astype(float),
+            "bedrooms": rng.integers(1, 5, size=n).astype(float),
+            "rooms": rng.integers(2, 8, size=n).astype(float),
+            "construction_year": rng.integers(1900, 2025, size=n).astype(float),
+            "latitude": rng.uniform(51, 53, size=n),
+            "longitude": rng.uniform(3, 6, size=n),
+            "photo_count": rng.integers(1, 30, size=n).astype(float),
+            "views": rng.integers(10, 500, size=n).astype(float),
+            "saves": rng.integers(0, 50, size=n).astype(float),
+            "price_per_sqm": rng.integers(2000, 6000, size=n).astype(float),
+            "has_garden": rng.choice([True, False], size=n),
+            "has_balcony": rng.choice([True, False], size=n),
+            "has_solar_panels": rng.choice([True, False], size=n),
+            "has_heat_pump": rng.choice([True, False], size=n),
+            "has_roof_terrace": rng.choice([True, False], size=n),
+            "is_energy_efficient": rng.choice([True, False], size=n),
+            "is_monument": rng.choice([True, False], size=n),
+        }
+        return pd.DataFrame(data)
+
+    @patch("data_platform.assets.ml.elo_inference.mlflow")
+    @patch("data_platform.assets.ml.elo_inference.pd.read_sql")
+    @patch("data_platform.assets.ml.elo_inference.render_sql", return_value="SQL")
+    def test_scores_listings(self, mock_render, mock_read_sql, mock_mlflow):
+        from data_platform.assets.ml.elo_inference import elo_inference
+
+        df = self._make_unscored_df(5)
+        mock_read_sql.return_value = df
+
+        # Mock MLflow best run
+        best_run = MagicMock()
+        best_run.info.run_id = "run-abc"
+        best_run.data.metrics = {"rmse": 0.5}
+        client = mock_mlflow.tracking.MlflowClient.return_value
+        client.get_experiment_by_name.return_value = MagicMock(experiment_id="1")
+        client.search_runs.return_value = [best_run]
+
+        # Mock model
+        mock_model = MagicMock()
+        mock_model.predict.return_value = np.random.default_rng(42).uniform(
+            -3, 3, size=5
+        )
+        mock_mlflow.lightgbm.load_model.return_value = mock_model
+
+        # Mock resources
+        postgres = MagicMock()
+        engine = MagicMock()
+        conn = MagicMock()
+        engine.begin.return_value.__enter__ = MagicMock(return_value=conn)
+        engine.begin.return_value.__exit__ = MagicMock(return_value=False)
+        postgres.get_engine.return_value = engine
+
+        mlflow_resource = MagicMock()
+        mlflow_resource.get_tracking_uri.return_value = "http://mlflow:5000"
+
+        context = build_asset_context()
+        config = EloInferenceConfig()
+
+        result = elo_inference(context, config, postgres, mlflow_resource)
+
+        assert result.metadata["scored"] == 5
+        assert result.metadata["mlflow_run_id"].value == "run-abc"
+        assert "predicted_elo_mean" in result.metadata
+        mock_model.predict.assert_called_once()
+
+    @patch("data_platform.assets.ml.elo_inference.pd.read_sql")
+    @patch("data_platform.assets.ml.elo_inference.render_sql", return_value="SQL")
+    def test_empty_returns_zero_scored(self, mock_render, mock_read_sql):
+        from data_platform.assets.ml.elo_inference import elo_inference
+
+        mock_read_sql.return_value = pd.DataFrame()
+
+        postgres = MagicMock()
+        engine = MagicMock()
+        conn = MagicMock()
+        engine.begin.return_value.__enter__ = MagicMock(return_value=conn)
+        engine.begin.return_value.__exit__ = MagicMock(return_value=False)
+        postgres.get_engine.return_value = engine
+
+        mlflow_resource = MagicMock()
+        context = build_asset_context()
+        config = EloInferenceConfig()
+
+        result = elo_inference(context, config, postgres, mlflow_resource)
+
+        assert result.metadata["scored"] == 0
+        assert result.metadata["status"].value == "No new listings to score."
+
+
+# ---------------------------------------------------------------------------
+# listing_alert asset
+# ---------------------------------------------------------------------------
+
+
+class TestListingAlertAsset:
+    def _make_predictions_df(self, n=3):
+        """Build a DataFrame of high-ELO predictions."""
+        data = {
+            "global_id": [f"listing_{i}" for i in range(n)],
+            "predicted_elo": [1650.0 + i * 10 for i in range(n)],
+            "current_price": [350_000 + i * 10_000 for i in range(n)],
+            "city": ["Amsterdam", "Rotterdam", "Utrecht"][:n],
+            "living_area": [80 + i * 5 for i in range(n)],
+            "rooms": [4, 5, 3][:n],
+            "energy_label": ["A", "B", "C"][:n],
+            "price_per_sqm": [4375, 4000, 3800][:n],
+            "title": [f"Teststraat {i}" for i in range(n)],
+            "url": [f"https://funda.nl/{i}" for i in range(n)],
+        }
+        return pd.DataFrame(data)
+
+    @patch("data_platform.assets.ml.discord_alerts.requests.post")
+    @patch("data_platform.assets.ml.discord_alerts.pd.read_sql")
+    @patch("data_platform.assets.ml.discord_alerts.render_sql", return_value="SQL")
+    def test_sends_notifications(self, mock_render, mock_read_sql, mock_post):
+        from data_platform.assets.ml.discord_alerts import listing_alert
+
+        df = self._make_predictions_df(3)
+        mock_read_sql.return_value = df
+        mock_post.return_value = MagicMock(status_code=200)
+
+        postgres = MagicMock()
+        engine = MagicMock()
+        conn = MagicMock()
+        engine.begin.return_value.__enter__ = MagicMock(return_value=conn)
+        engine.begin.return_value.__exit__ = MagicMock(return_value=False)
+        postgres.get_engine.return_value = engine
+
+        discord = MagicMock()
+        discord.get_webhook_url.return_value = "https://discord.com/webhook/test"
+
+        context = build_asset_context()
+        config = DiscordNotificationConfig()
+
+        result = listing_alert(context, config, postgres, discord)
+
+        assert result.metadata["notified"] == 3
+        mock_post.assert_called_once()
+
+    @patch("data_platform.assets.ml.discord_alerts.pd.read_sql")
+    @patch("data_platform.assets.ml.discord_alerts.render_sql", return_value="SQL")
+    def test_empty_returns_zero_notified(self, mock_render, mock_read_sql):
+        from data_platform.assets.ml.discord_alerts import listing_alert
+
+        mock_read_sql.return_value = pd.DataFrame()
+
+        postgres = MagicMock()
+        engine = MagicMock()
+        conn = MagicMock()
+        engine.begin.return_value.__enter__ = MagicMock(return_value=conn)
+        engine.begin.return_value.__exit__ = MagicMock(return_value=False)
+        postgres.get_engine.return_value = engine
+
+        discord = MagicMock()
+        context = build_asset_context()
+        config = DiscordNotificationConfig()
+
+        result = listing_alert(context, config, postgres, discord)
+
+        assert result.metadata["notified"] == 0
+
+    @patch("data_platform.assets.ml.discord_alerts.requests.post")
+    @patch("data_platform.assets.ml.discord_alerts.pd.read_sql")
+    @patch("data_platform.assets.ml.discord_alerts.render_sql", return_value="SQL")
+    def test_batches_large_result_set(self, mock_render, mock_read_sql, mock_post):
+        from data_platform.assets.ml.discord_alerts import listing_alert
+
+        # 15 listings → should produce 2 batches (10 + 5)
+        data = {
+            "global_id": [f"listing_{i}" for i in range(15)],
+            "predicted_elo": [1700.0] * 15,
+            "current_price": [400_000] * 15,
+            "city": ["Amsterdam"] * 15,
+            "living_area": [90] * 15,
+            "rooms": [4] * 15,
+            "energy_label": ["A"] * 15,
+            "price_per_sqm": [4444] * 15,
+            "title": [f"Street {i}" for i in range(15)],
+            "url": [f"https://funda.nl/{i}" for i in range(15)],
+        }
+        mock_read_sql.return_value = pd.DataFrame(data)
+        mock_post.return_value = MagicMock(status_code=200)
+
+        postgres = MagicMock()
+        engine = MagicMock()
+        conn = MagicMock()
+        engine.begin.return_value.__enter__ = MagicMock(return_value=conn)
+        engine.begin.return_value.__exit__ = MagicMock(return_value=False)
+        postgres.get_engine.return_value = engine
+
+        discord = MagicMock()
+        discord.get_webhook_url.return_value = "https://discord.com/webhook/test"
+
+        context = build_asset_context()
+        config = DiscordNotificationConfig()
+
+        result = listing_alert(context, config, postgres, discord)
+
+        assert result.metadata["notified"] == 15
+        assert mock_post.call_count == 2
+
+
+# ---------------------------------------------------------------------------
+# Config defaults
+# ---------------------------------------------------------------------------
+
+
+class TestMLConfigs:
+    def test_elo_inference_config_defaults(self):
+        config = EloInferenceConfig()
+        assert config.mlflow_experiment == "elo-rating-prediction"
+        assert config.metric == "rmse"
+        assert config.ascending is True
+
+    def test_discord_notification_config_defaults(self):
+        config = DiscordNotificationConfig()
+        assert config.min_elo == 1600
diff --git a/tests/test_ops.py b/tests/test_ops.py
new file mode 100644
index 0000000..138bf4a
--- /dev/null
+++ b/tests/test_ops.py
@@ -0,0 +1,153 @@
+"""Tests for Dagster ops — elementary and source freshness."""
+
+import subprocess
+from unittest.mock import patch
+
+import pytest
+from dagster import build_op_context
+
+from data_platform.ops.check_source_freshness import (
+    SourceFreshnessConfig,
+)
+from data_platform.ops.elementary import (
+    _elementary_schema_exists,
+    elementary_generate_report,
+    elementary_run_models,
+)
+
+
+# ---------------------------------------------------------------------------
+# SourceFreshnessConfig
+# ---------------------------------------------------------------------------
+
+
+class TestSourceFreshnessConfig:
+    def test_accepts_source_name(self):
+        cfg = SourceFreshnessConfig(source_name="raw_funda")
+        assert cfg.source_name == "raw_funda"
+
+
+# ---------------------------------------------------------------------------
+# _elementary_schema_exists
+# ---------------------------------------------------------------------------
+
+
+class TestElementarySchemaExists:
+    @patch("data_platform.resources._retry_on_operational_error")
+    @patch("data_platform.ops.elementary.create_engine")
+    def test_returns_true_when_schema_present(self, mock_create_engine, mock_retry):
+        mock_retry.return_value = True
+        with patch.dict(
+            "os.environ",
+            {
+                "POSTGRES_USER": "u",
+                "POSTGRES_PASSWORD": "p",
+                "POSTGRES_HOST": "localhost",
+                "POSTGRES_PORT": "5432",
+                "POSTGRES_DB": "db",
+            },
+        ):
+            result = _elementary_schema_exists()
+        assert result is True
+        mock_create_engine.assert_called_once()
+
+    @patch("data_platform.resources._retry_on_operational_error")
+    @patch("data_platform.ops.elementary.create_engine")
+    def test_returns_false_when_schema_absent(self, mock_create_engine, mock_retry):
+        mock_retry.return_value = False
+        with patch.dict(
+            "os.environ",
+            {
+                "POSTGRES_USER": "u",
+                "POSTGRES_PASSWORD": "p",
+                "POSTGRES_HOST": "localhost",
+                "POSTGRES_PORT": "5432",
+                "POSTGRES_DB": "db",
+            },
+        ):
+            result = _elementary_schema_exists()
+        assert result is False
+
+
+# ---------------------------------------------------------------------------
+# elementary_run_models
+# ---------------------------------------------------------------------------
+
+
+class TestElementaryRunModels:
+    @patch("data_platform.ops.elementary._elementary_schema_exists", return_value=True)
+    def test_skips_when_schema_exists(self, mock_exists):
+        context = build_op_context()
+        elementary_run_models(context)
+        mock_exists.assert_called_once()
+
+    @patch(
+        "data_platform.ops.elementary.subprocess.run",
+        return_value=subprocess.CompletedProcess(
+            args=[], returncode=0, stdout="ok", stderr=""
+        ),
+    )
+    @patch("data_platform.ops.elementary._elementary_schema_exists", return_value=False)
+    def test_runs_dbt_when_schema_missing(self, mock_exists, mock_run):
+        context = build_op_context()
+        elementary_run_models(context)
+        mock_run.assert_called_once()
+        args = mock_run.call_args[0][0]
+        assert "dbt" in args
+        assert "run" in args
+        assert "elementary" in args
+
+    @patch(
+        "data_platform.ops.elementary.subprocess.run",
+        return_value=subprocess.CompletedProcess(
+            args=[], returncode=1, stdout="", stderr="error"
+        ),
+    )
+    @patch("data_platform.ops.elementary._elementary_schema_exists", return_value=False)
+    def test_raises_on_dbt_failure(self, mock_exists, mock_run):
+        context = build_op_context()
+        with pytest.raises(Exception, match="dbt run elementary failed"):
+            elementary_run_models(context)
+
+
+# ---------------------------------------------------------------------------
+# elementary_generate_report
+# ---------------------------------------------------------------------------
+
+
+class TestElementaryGenerateReport:
+    @patch(
+        "data_platform.ops.elementary.subprocess.run",
+        return_value=subprocess.CompletedProcess(
+            args=[], returncode=0, stdout="report generated", stderr=""
+        ),
+    )
+    def test_calls_edr_report(self, mock_run):
+        context = build_op_context()
+        elementary_generate_report(context)
+        mock_run.assert_called_once()
+        args = mock_run.call_args[0][0]
+        assert "edr" in args
+        assert "report" in args
+
+    @patch(
+        "data_platform.ops.elementary.subprocess.run",
+        return_value=subprocess.CompletedProcess(
+            args=[], returncode=1, stdout="", stderr="fatal error"
+        ),
+    )
+    def test_raises_on_failure(self, mock_run):
+        context = build_op_context()
+        with pytest.raises(Exception, match="edr report failed"):
+            elementary_generate_report(context)
+
+    @patch(
+        "data_platform.ops.elementary.subprocess.run",
+        return_value=subprocess.CompletedProcess(
+            args=[], returncode=0, stdout="done", stderr=""
+        ),
+    )
+    def test_success_returns_none(self, mock_run):
+        context = build_op_context()
+        result = elementary_generate_report(context)
+        assert result is None