diff --git a/cloudbuild-test.yaml b/cloudbuild-test.yaml
new file mode 100644
index 00000000..b438b2be
--- /dev/null
+++ b/cloudbuild-test.yaml
@@ -0,0 +1,28 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+timeout: 7200s # 2 hours
+
+steps:
+
+- id: googleapis-test
+  name: gcr.io/gapic-images/googleapis:prod
+  entrypoint: "/workspace/tools/bazel-test.sh"
+  waitFor: ["-"]
+  args:
+    - $REVISION_ID
+
+options:
+  logging: CLOUD_LOGGING_ONLY
+  machineType: 'E2_HIGHCPU_32'
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diff --git a/tools/bazel-test.sh b/tools/bazel-test.sh
new file mode 100755
index 00000000..f7b5729e
--- /dev/null
+++ b/tools/bazel-test.sh
@@ -0,0 +1,57 @@
+#!/bin/bash
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -eo pipefail
+
+apt-get update -y
+apt-get install -y jq
+
+GAPIC_GENERATOR_COMMIT=$1
+if [[ -z "${GAPIC_GENERATOR_COMMIT}" ]]
+then
+  echo "GAPIC_GENERATOR_COMMIT not set, trying default"
+  echo "Usage: $0 <commit-sha>"
+  exit 1
+fi
+
+git clone --depth=1 https://github.com/googleapis/googleapis
+pushd googleapis
+
+# debug bazel version
+bazelisk --version
+
+echo "Testing gapic-generator-csharp with ${GAPIC_GENERATOR_COMMIT}"
+
+# update current version of gapic-generator-csharp
+jq ".csharp.commit = \"${GAPIC_GENERATOR_COMMIT}\" | .csharp.version = null | .csharp.sha = null" generator-versions.json > generator-versions2.json
+mv generator-versions2.json generator-versions.json
+cat generator-versions.json
+
+# determine where bazel will output files
+BAZEL_BIN=$(bazelisk info bazel-bin)
+
+# try generating the google/example/library/v1 csharp gapic library
+bazelisk build //google/example/library/v1:google-cloud-example-library-v1-csharp
+
+# ensure we created the tarball we expect
+ls -al "${BAZEL_BIN}/google/example/library/v1/google-cloud-example-library-v1-csharp.tar.gz"
+
+# try generating the google/ads/googleads/v20 csharp gapic library
+bazelisk build //google/ads/googleads/v20:googleads-csharp
+
+# ensure we created the tarball we expect
+ls -al "${BAZEL_BIN}/google/ads/googleads/v20/googleads-csharp.tar.gz"
+
+popd
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