diff --git a/testing/quality_contract.json b/testing/quality_contract.json
index 06741e18..371e8e1e 100644
--- a/testing/quality_contract.json
+++ b/testing/quality_contract.json
@@ -16,20 +16,27 @@
   ],
   "managed_modules": [
     "ci/scripts/publish_test_metrics.py",
-    "services/mailu/scripts/mailu_sync.py",
+    "ci/scripts/publish_test_metrics_quality.py",
     "testing/__init__.py",
     "testing/quality_contract.py",
     "testing/quality_docs.py",
     "testing/quality_hygiene.py",
     "testing/quality_coverage.py",
-    "testing/quality_gate.py"
+    "testing/quality_gate.py",
+    "ci/tests/glue/test_ariadne_schedules.py",
+    "ci/tests/glue/test_glue_metrics.py",
+    "testing/tests/test_publish_test_metrics.py",
+    "testing/tests/test_quality_contract.py",
+    "testing/tests/test_quality_gate.py"
   ],
   "lint_paths": [
     "ci/scripts/publish_test_metrics.py",
+    "ci/scripts/publish_test_metrics_quality.py",
     "ci/tests/glue",
     "scripts/tests",
     "services/comms/scripts/tests",
     "services/mailu/scripts/mailu_sync.py",
+    "testing/tests",
     "testing"
   ],
   "pytest_suites": {
@@ -70,6 +77,8 @@
       "hygiene",
       "unit",
       "coverage",
+      "sonarqube",
+      "ironbank",
       "glue"
     ]
   },
@@ -151,6 +160,7 @@
     "minimum_percent": 95.0,
     "tracked_files": [
       "ci/scripts/publish_test_metrics.py",
+      "ci/scripts/publish_test_metrics_quality.py",
       "testing/quality_contract.py",
       "testing/quality_docs.py",
       "testing/quality_hygiene.py",
diff --git a/testing/tests/test_publish_test_metrics_quality.py b/testing/tests/test_publish_test_metrics_quality.py
new file mode 100644
index 00000000..2b6d2cb7
--- /dev/null
+++ b/testing/tests/test_publish_test_metrics_quality.py
@@ -0,0 +1,105 @@
+"""Focused tests for publish_test_metrics quality helper fallbacks."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+from ci.scripts import publish_test_metrics_quality as quality_helpers
+
+
+def test_infer_workspace_coverage_percent_handles_candidate_paths_and_parse_failures(tmp_path: Path) -> None:
+    """Coverage inference should honor explicit XML hints and fail closed on bad XML."""
+
+    build_dir = tmp_path / "build"
+    build_dir.mkdir()
+
+    coverage_xml = build_dir / "custom-coverage.xml"
+    coverage_xml.write_text('<coverage line-rate="0.975" />', encoding="utf-8")
+    summary = {"results": [None, {"name": "coverage", "coverage_xml": str(coverage_xml)}]}
+    assert quality_helpers._infer_workspace_coverage_percent(summary, "build/default.xml") == 97.5
+
+    missing_xml = build_dir / "missing.xml"
+    assert quality_helpers._infer_workspace_coverage_percent({}, str(missing_xml)) == 0.0
+
+    no_rate_xml = build_dir / "no-rate.xml"
+    no_rate_xml.write_text("<coverage />", encoding="utf-8")
+    assert quality_helpers._infer_workspace_coverage_percent({}, str(no_rate_xml)) == 0.0
+
+    bad_xml = build_dir / "bad.xml"
+    bad_xml.write_text("<coverage", encoding="utf-8")
+    assert quality_helpers._infer_workspace_coverage_percent({}, str(bad_xml)) == 0.0
+
+
+def test_infer_source_lines_over_500_counts_only_string_hygiene_issues() -> None:
+    """LOC inference should ignore non-lists and only count explicit over-limit strings."""
+
+    summary = {
+        "results": [
+            None,
+            {"name": "docs", "issues": ["ignore me"]},
+            {"name": "loc", "issues": "not-a-list"},
+            {
+                "name": "hygiene",
+                "issues": [
+                    "file exceeds 500 LOC: alpha.py (501)",
+                    42,
+                    "naming rule failed: beta.py",
+                    "file exceeds 500 LOC: gamma.py (650)",
+                ],
+            },
+        ]
+    }
+
+    assert quality_helpers._infer_source_lines_over_500(summary) == 2
+
+
+def test_build_check_statuses_uses_fallbacks_for_tests_docs_and_gate_glue() -> None:
+    """Fallback status synthesis should derive missing checks from related signals."""
+
+    statuses = quality_helpers._build_check_statuses(
+        summary={
+            "results": [
+                {"name": "docs", "status": "ok"},
+                {"name": "smell", "status": "ok"},
+                {"name": "gate", "status": "warning"},
+            ]
+        },
+        tests={"tests": 3, "failures": 1, "errors": 0, "skipped": 0},
+        workspace_line_coverage_percent=0.0,
+        source_lines_over_500=0,
+        sonarqube_report={},
+        supply_chain_report={},
+        supply_chain_required=False,
+    )
+
+    assert statuses["tests"] == "failed"
+    assert statuses["coverage"] == "not_applicable"
+    assert statuses["loc"] == "ok"
+    assert statuses["docs_naming"] == "ok"
+    assert statuses["gate_glue"] == "failed"
+
+
+def test_build_check_statuses_preserves_explicit_loc_docs_and_glue_results() -> None:
+    """Explicit canonical statuses should win over fallback inference."""
+
+    statuses = quality_helpers._build_check_statuses(
+        summary={
+            "results": [
+                {"name": "loc", "status": "ok"},
+                {"name": "docs_naming", "status": "ok"},
+                {"name": "gate_glue", "status": "ok"},
+            ]
+        },
+        tests={"tests": 0, "failures": 0, "errors": 0, "skipped": 0},
+        workspace_line_coverage_percent=96.0,
+        source_lines_over_500=9,
+        sonarqube_report={},
+        supply_chain_report={},
+        supply_chain_required=False,
+    )
+
+    assert statuses["tests"] == "not_applicable"
+    assert statuses["coverage"] == "ok"
+    assert statuses["loc"] == "ok"
+    assert statuses["docs_naming"] == "ok"
+    assert statuses["gate_glue"] == "ok"
diff --git a/testing/tests/test_quality_coverage_helpers.py b/testing/tests/test_quality_coverage_helpers.py
new file mode 100644
index 00000000..5eaa624e
--- /dev/null
+++ b/testing/tests/test_quality_coverage_helpers.py
@@ -0,0 +1,76 @@
+"""Focused coverage-helper tests for titan-iac quality modules."""
+
+from __future__ import annotations
+
+import textwrap
+from pathlib import Path
+
+from testing.quality_coverage import compute_workspace_line_coverage, run_check
+
+
+def test_compute_workspace_line_coverage_handles_missing_xml(tmp_path: Path) -> None:
+    """Missing coverage XML should produce a zero workspace coverage score."""
+
+    contract = {"coverage": {"tracked_files": ["managed.py"]}}
+    assert compute_workspace_line_coverage(contract, tmp_path, tmp_path / "missing.xml") == 0.0
+
+
+def test_compute_workspace_line_coverage_averages_present_tracked_files(tmp_path: Path) -> None:
+    """Workspace coverage should average only tracked files that appear in the report."""
+
+    coverage_xml = tmp_path / "coverage.xml"
+    coverage_xml.write_text(
+        textwrap.dedent(
+            """\
+            <coverage>
+              <packages>
+                <package>
+                  <classes>
+                    <class filename="alpha.py" line-rate="1.0" />
+                    <class filename="beta.py" line-rate="0.5" />
+                  </classes>
+                </package>
+              </packages>
+            </coverage>
+            """
+        ),
+        encoding="utf-8",
+    )
+
+    contract = {"coverage": {"tracked_files": ["alpha.py", "beta.py", "missing.py"]}}
+    assert compute_workspace_line_coverage(contract, tmp_path, coverage_xml) == 75.0
+
+
+def test_run_check_keeps_relative_names_when_source_roots_do_not_match(tmp_path: Path) -> None:
+    """Relative filenames should remain relative when no declared source root contains them."""
+
+    coverage_xml = tmp_path / "coverage.xml"
+    unmatched_root = tmp_path / "other-root"
+    unmatched_root.mkdir()
+    coverage_xml.write_text(
+        textwrap.dedent(
+            f"""\
+            <coverage>
+              <sources>
+                <source>{unmatched_root}</source>
+              </sources>
+              <packages>
+                <package>
+                  <classes>
+                    <class filename="relative.py" line-rate="0.80" />
+                  </classes>
+                </package>
+              </packages>
+            </coverage>
+            """
+        ),
+        encoding="utf-8",
+    )
+
+    issues = run_check(
+        {"coverage": {"minimum_percent": 95.0, "tracked_files": ["relative.py"]}},
+        tmp_path,
+        coverage_xml,
+    )
+
+    assert issues == ["coverage below 95.0%: relative.py (80.0%)"]
diff --git a/testing/tests/test_quality_hygiene_helpers.py b/testing/tests/test_quality_hygiene_helpers.py
new file mode 100644
index 00000000..a303c650
--- /dev/null
+++ b/testing/tests/test_quality_hygiene_helpers.py
@@ -0,0 +1,26 @@
+"""Focused hygiene-helper tests for titan-iac quality modules."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+from testing.quality_hygiene import count_files_over_line_limit
+
+
+def test_count_files_over_line_limit_counts_only_long_matches(tmp_path: Path) -> None:
+    """Only files beyond the configured limit should contribute to the LOC total."""
+
+    tests_dir = tmp_path / "tests"
+    tests_dir.mkdir()
+    (tests_dir / "test_short.py").write_text("line\n", encoding="utf-8")
+    (tests_dir / "test_long.py").write_text("line\n" * 4, encoding="utf-8")
+    (tests_dir / "notes.txt").write_text("line\n" * 8, encoding="utf-8")
+
+    contract = {
+        "hygiene": {
+            "max_lines": 3,
+            "line_limit_globs": ["tests/*.py"],
+        }
+    }
+
+    assert count_files_over_line_limit(contract, tmp_path) == 1