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+# Verification system
+
+Applications are executed in our Verification system to ensure that:
+
+1. Installation succeeds: All resources are applied and waited for to become healthy.
+1. Functionality tests pass: The deployer starts the Tester Pod and watches its exit status. Zero means
+success, non-zero means failure.
+1. Uninstallation succeeds: Application and all its resources are successfully removed from the cluster.
+
+Successful results are required before application can be published to the GCP Marketplace.
+
+## Functionality tests
+
+Packaging functionality tests involves the following steps.
+
+### 1. Create a `/data-test` folder
+
+The structure is similar to the one in `/data` folder, but with the configuration and manifests that
+are only meant to be applied when the application is installed in verification mode. Some examples of
+`/data-test` for different deployers:
+
+* Helm based deployer:
+
+    ```
+    data-test/
+      chart/
+        nginx.tar.gz
+      schema.yaml
+    ```
+
+* Kubectl based deployer:
+
+    ```
+    data-test/
+      manifest/
+        tester.yaml.template
+      schema.yaml
+    ```
+
+### 3. Writing the test schema.yaml
+
+The `/data-test/schema.yaml` file should be used to:
+
+* Declare properties needed for test, which are not already declared in `/data/schema.yaml`. One 
+common example is the image for the Tester Pod.
+* Declare default values for the properties in `/data/schema.yaml` that do not include default values.
+The Verification system will use the default values to run the application. Refer to [mpdev](https://github.com/GoogleCloudPlatform/marketplace-k8s-app-tools/blob/master/docs/mpdev-references.md#smoke-test-an-application)
+for more details.
+
+### 4. Include a Pod manifest to execute the tests
+
+The deployer starts the Tester Pod after all the Kubernetes resources are healthy. It should run all
+tests that assert the functionality of the application. If all tests pass, the Tester Pod must complete
+with a zero exit status. Otherwise, it must complete with a non-zero exit status.
+
+The Tester Pod needs to be annotated with `marketplace.cloud.google.com/verification:test`, so the Verification
+can detect which Pod to watch for test results.
+
+Helm based deployers can alternatively use `helm.sh/hook:test-success`, to keep compatibility with
+existing helm tests. Our tools will replace the helm annotation with the verification annotation during
+deployment time.
+
+
+### 5. (Optional) Add or modify resources as needed
+
+The `/data-test` folder is a way of including additional Kubernetes resources for verification purposes,
+or even modifying existing ones. The configuration defined in `/data-test` overrides the default configuration
+in `/data` according to the following rules:
+
++  Helm `values.yaml` files are merged. Values defined in `/data-test`
+   override the values in `/data`.
++  Schema properties are merged. Schema entries defined in `properties` from
+   `/data-test/schema.yaml` will override entries defined in `properties`
+   from `/data/schema.yaml`
++  All other files in `/data-test` will override files in `/data`. In case of helm deployer, which
+   contains a .tar.gz file, the files are extracted first and then replaced.
+
+You can also refer to [examples](https://github.com/GoogleCloudPlatform/click-to-deploy/tree/master/k8s) of open source apps packaged by GCP Marketplace.
+
+## Running Verification locally
+
+The verification triggered locally is the same run in our Verification system. It should be run prior
+to submitting the application, so mistakes can be caught sooner. Use the [mpdev](https://github.com/GoogleCloudPlatform/marketplace-k8s-app-tools/blob/master/docs/mpdev-references.md#smoke-test-an-application) command to run verification:
+
+```
+mpdev verify \
+  --deployer=<deployer image to be verified>
+```
+
+Make sure to include both the image name and the sha256/tag of the image, ex:
+
+```
+--deployer=gcr.io/my-project/my-app/deployer@sha256:123456789abcdef123456789abcdef123456789abcdef123456789abcdef1234
+```
+or
+```
+--deployer=gcr.io/my-project/my-app/deployer:1.0
+```
+
+In summary, this is what happens:
+
+1. Folder `/data-test` is overlayed on to `/data`, to prepare the resources such as the Tester Pod.
+1. A test namespace is created.
+1. Manifests for the app is applied in the test namespace.
+1. Status on Kubernetes resources are checked to ensure that the app is ready for testing.
+1. Tester Pods are started. If a Tester Pod fails, the deployer Job fails.
+1. Application and its resources are removed.
+1. Test namespace is deleted.