diff --git a/.github/scripts/run_chart_tests.py b/.github/scripts/run_chart_tests.py
index 4568624..04a3f7d 100755
--- a/.github/scripts/run_chart_tests.py
+++ b/.github/scripts/run_chart_tests.py
@@ -23,9 +23,11 @@
   - Checks if helm-unittest plugin is installed
   - If not installed, runs: helm plugin install (does not require Makefile)
   - Finds all directories under charts/ containing Chart.yaml
-  - For each chart directory with a Makefile, runs: make -C <chart_dir> tests
+  - For each chart directory with a Makefile, runs: make -C <chart_dir> test-all
+    (when defined) or `make tests` (legacy fallback) — `test-all` exercises the
+    parent-recursive suite AND each subchart standalone, catching helper/value
+    divergence that the parent-only run masks
   - Skips charts without a Makefile (e.g., library charts with no tests)
-  - Subcharts are tested through their parent chart's test suite
 
 REQUIREMENTS:
   - helm CLI must be installed
@@ -91,8 +93,15 @@ def main():
             skipped_charts.append(chart_dir)
             continue
 
-        print(f"Running helm chart tests in {chart_dir}...")
-        test_result = subprocess.run(["make", "-C", chart_dir, "tests"])
+        # Prefer `test-all` (parent + standalone subcharts) when the chart's Makefile defines
+        # it; fall back to legacy `tests` target for charts that haven't adopted it yet.
+        makefile_targets = subprocess.run(
+            ["make", "-C", chart_dir, "-pn"], capture_output=True, text=True
+        ).stdout
+        target = "test-all" if "\ntest-all:" in makefile_targets else "tests"
+
+        print(f"Running helm chart tests in {chart_dir} (target: {target})...")
+        test_result = subprocess.run(["make", "-C", chart_dir, target])
         if test_result.returncode != 0:
             print(f"Helm chart tests failed in {chart_dir}.")
             failed_charts.append(chart_dir)
diff --git a/charts/platform/Makefile b/charts/platform/Makefile
index c90fac2..8172bba 100644
--- a/charts/platform/Makefile
+++ b/charts/platform/Makefile
@@ -1,4 +1,4 @@
-.PHONY: test tests unittests unittests-no-build debug check-unittest-plugin install-unittest-plugin clean-deps clean-subchart-packages rebuild-deps rebuild-deps-and-unpack rebuild-deps-force help
+.PHONY: test tests unittests unittests-no-build debug check-unittest-plugin install-unittest-plugin clean-deps clean-subchart-packages rebuild-deps rebuild-deps-and-unpack rebuild-deps-force unittests-standalone test-all help
 
 # Run tests (with external dependencies rebuild) - DEFAULT behavior
 test: unittests
@@ -6,12 +6,20 @@ tests: test
 test-no-build: unittests-no-build
 tests-no-build: test-no-build
 
+# Run BOTH the parent's recursive test suite AND each standalone-installable subchart's
+# tests rendered with that subchart's own values/helpers (matching how a customer would
+# install it on its own). Catches helper / values divergence that the parent-recursive
+# run silently masks.
+test-all: unittests unittests-standalone
+
 help:
 	@echo "Seqera Platform Helm Chart - Available Make Targets"
 	@echo ""
 	@echo "Testing:"
 	@echo "  make test                        - Rebuild all Platform dependencies and run tests (DEFAULT)"
 	@echo "  make test-no-build               - Run tests without rebuilding dependencies"
+	@echo "  make test-all                    - Run parent-recursive tests AND each subchart standalone"
+	@echo "  make unittests-standalone        - Run each subchart's tests standalone (no parent context)"
 	@echo "  make debug                       - Run tests in debug mode"
 	@echo "  make unittests-update-snapshots  - Rebuild all Platform dependencies and update snapshots"
 	@echo ""
@@ -119,6 +127,34 @@ unittests: rebuild-deps
 	@echo "Running unit tests..."
 	@helm unittest .
 
+# Run each subchart's unit tests STANDALONE — i.e. invoke `helm unittest` from inside the
+# subchart directory so its templates render with its own values.yaml / helpers, not under
+# the parent's merged context. A subchart is considered "standalone-installable" if it ships
+# its own `tests/` directory.
+#
+# This complements `unittests`: the parent-recursive run exercises the full integrated
+# deployment, this target exercises each subchart as if a customer installed it on its own.
+unittests-standalone: rebuild-deps
+	@echo "Running unit tests for each standalone-installable subchart..."
+	@failed=""; \
+	for subchart_dir in charts/*/; do \
+		subchart=$$(basename $$subchart_dir); \
+		if [ ! -d "$$subchart_dir/tests" ]; then \
+			echo "→ skipping $$subchart (no tests/ directory)"; \
+			continue; \
+		fi; \
+		echo ""; \
+		echo "→ $$subchart (standalone)"; \
+		(cd "$$subchart_dir" && helm unittest .) || failed="$$failed $$subchart"; \
+	done; \
+	if [ -n "$$failed" ]; then \
+		echo ""; \
+		echo "✗ standalone tests failed for:$$failed"; \
+		exit 1; \
+	fi; \
+	echo ""; \
+	echo "✓ all standalone subchart tests passed"
+
 unittests-update-snapshots: rebuild-deps
 	@echo "Running unit tests and updating snapshots..."
 	@helm unittest -u .