diff --git a/integration_test_project/tests/assert_lineage_edges_cover_models.sql b/integration_test_project/tests/assert_lineage_edges_cover_models.sql
index f0dd335d..8e8b3a19 100644
--- a/integration_test_project/tests/assert_lineage_edges_cover_models.sql
+++ b/integration_test_project/tests/assert_lineage_edges_cover_models.sql
@@ -1,7 +1,10 @@
 {{ config(enabled = target.type == "snowflake") }}
 -- lineage_edges must be non-empty, and every model in the latest graph
 -- state that declares dependencies must appear as a child of >= 1 edge.
--- Fails (returns rows) for any model-with-deps that has no edge.
+-- Fails (returns rows) for any model-with-deps that has no edge, and for an
+-- empty mart. The empty-mart branch matters: without it this test passes
+-- vacuously when the mart has no rows at all, since models_with_deps is
+-- itself empty in that case.
 with latest_models as (
     select
         node_id
@@ -22,9 +25,20 @@ models_with_deps as (
 edge_children as (
     select distinct child_node_id
     from {{ ref("dim_dbt__lineage_edges") }}
+),
+
+edge_count as (
+    select count(*) as row_count
+    from {{ ref("dim_dbt__lineage_edges") }}
 )
 
-select models_with_deps.node_id as model_missing_edge
+select 'model_missing_edge: ' || models_with_deps.node_id as issue
 from models_with_deps
 left join edge_children on models_with_deps.node_id = edge_children.child_node_id
 where edge_children.child_node_id is null
+
+union all
+
+select 'empty_mart' as issue
+from edge_count
+where row_count = 0
diff --git a/tox.ini b/tox.ini
index 7a89bd37..0b995699 100644
--- a/tox.ini
+++ b/tox.ini
@@ -114,12 +114,30 @@ commands = sqlfluff fix models --ignore parsing
 
 ## Integration Tests
 ### Snowflake   #############################################################################################
+# Snowflake legs run `dbt build` TWICE, and the first pass excludes tests.
+#
+# The schema is per-commit (`dbt_artifacts_test_commit_..._<GITHUB_SHA>` in
+# profiles.yml), so every CI run starts against an empty schema. The source
+# tables are created empty by the run itself and are only populated by
+# `upload_results` in `on-run-end`, which fires AFTER all tests. On a single
+# build the consumption/observability marts are therefore empty when their
+# singular tests execute, and the three non-emptiness assertions
+# (assert_consumption_daily_has_smb, assert_run_health_daily_has_invocations,
+# assert_model_performance_valid) cannot pass.
+#
+# The first build populates the source tables via its own on-run-end hook;
+# the second asserts against that data. Tests are excluded from the first
+# pass or it would fail on those same three before any data lands.
+# Only the CI-active envs (latest / 1.11 / 1.10) get the warm-up —
+# `--exclude-resource-type` needs dbt-core >= 1.8, and 1.3-1.8 are
+# local-debug-only (see the release.yml version-matrix comment).
 [testenv:integration_snowflake]
 changedir = integration_test_project
 deps = dbt-snowflake<2.0.0
 commands =
     dbt clean
     dbt deps
+    dbt build --target snowflake --exclude-resource-type test
     dbt build --target snowflake
 
 [testenv:integration_snowflake_1_11_0]
@@ -133,6 +151,7 @@ deps =
 commands =
     dbt clean
     dbt deps
+    dbt build --target snowflake --exclude-resource-type test
     dbt build --target snowflake
 
 [testenv:integration_snowflake_1_10_0]
@@ -143,6 +162,7 @@ deps =
 commands =
     dbt clean
     dbt deps
+    dbt build --target snowflake --exclude-resource-type test
     dbt build --target snowflake
 
 [testenv:integration_snowflake_1_9_0]
@@ -153,7 +173,8 @@ deps =
 commands =
     dbt clean
     dbt deps
-    ; dbt build --target snowflake
+    dbt build --target snowflake --exclude-resource-type test
+    dbt build --target snowflake
 
 [testenv:integration_snowflake_1_8_0]
 changedir = integration_test_project