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# Contributing | ||
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## Rebasing contributions against master | ||
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PRs in this repo are merged using the [`rebase`](https://git-scm.com/docs/git-rebase) method. This keeps | ||
the git history clean by adding the PR commits to the most recent end of the commit history. It also has | ||
the benefit of keeping all the relevant commits for a given PR together, rather than spread throughout the | ||
git history based on when the commits were first created. | ||
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If the changes in your PR do not conflict with any of the existing code in the project, then Github supports | ||
automatic rebasing when the PR is accepted into the code. However, if there are conflicts (there will be | ||
a warning on the PR that reads "This branch cannot be rebased due to conflicts"), you will need to manually | ||
rebase the branch on master, fixing any conflicts along the way before the code can be merged. | ||
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## Testing | ||
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The Helm chart ships with both unit and acceptance tests. | ||
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The unit tests don't require any active Kubernetes cluster and complete | ||
very quickly. These should be used for fast feedback during development. | ||
The acceptance tests require a Kubernetes cluster with a configured `kubectl`. | ||
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### Prequisites | ||
* [Bats](https://github.com/bats-core/bats-core) | ||
```bash | ||
brew install bats-core | ||
``` | ||
* [yq](https://pypi.org/project/yq/) | ||
```bash | ||
brew install python-yq | ||
``` | ||
* [helm](https://helm.sh) | ||
```bash | ||
brew install kubernetes-helm | ||
``` | ||
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### Running The Tests | ||
To run the unit tests: | ||
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bats ./test/unit | ||
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To run the acceptance tests: | ||
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bats ./test/acceptance | ||
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If the acceptance tests fail, deployed resources in the Kubernetes cluster | ||
may not be properly cleaned up. We recommend recycling the Kubernetes cluster to | ||
start from a clean slate. | ||
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**Note:** There is a Terraform configuration in the | ||
[`test/terraform/`](https://github.com/hashicorp/consul-helm/tree/master/test/terraform) directory | ||
that can be used to quickly bring up a GKE cluster and configure | ||
`kubectl` and `helm` locally. This can be used to quickly spin up a test | ||
cluster for acceptance tests. Unit tests _do not_ require a running Kubernetes | ||
cluster. | ||
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### Writing Unit Tests | ||
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Changes to the Helm chart should be accompanied by appropriate unit tests. | ||
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#### Formatting | ||
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- Put tests in the test file in the same order as the variables appear in the `values.yaml`. | ||
- Start tests for a chart value with a header that says what is being tested, like this: | ||
``` | ||
#-------------------------------------------------------------------- | ||
# annotations | ||
``` | ||
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- Name the test based on what it's testing in the following format (this will be its first line): | ||
``` | ||
@test "<section being tested>: <short description of the test case>" { | ||
``` | ||
When adding tests to an existing file, the first section will be the same as the other tests in the file. | ||
#### Test Details | ||
[Bats](https://github.com/bats-core/bats-core) provides a way to run commands in a shell and inspect the output in an automated way. | ||
In all of the tests in this repo, the base command being run is [helm template](https://docs.helm.sh/helm/#helm-template) which turns the templated files into straight yaml output. | ||
In this way, we're able to test that the various conditionals in the templates render as we would expect. | ||
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Each test defines the files that should be rendered using the `-x` flag, then it might adjust chart values by adding `--set` flags as well. | ||
The output from this `helm template` command is then piped to [yq](https://pypi.org/project/yq/). | ||
`yq` allows us to pull out just the information we're interested in, either by referencing its position in the yaml file directly or giving information about it (like its length). | ||
The `-r` flag can be used with `yq` to return a raw string instead of a quoted one which is especially useful when looking for an exact match. | ||
The test passes or fails based on the conditional at the end that is in square brackets, which is a comparison of our expected value and the output of `helm template` piped to `yq`. | ||
The `| tee /dev/stderr ` pieces direct any terminal output of the `helm template` and `yq` commands to stderr so that it doesn't interfere with `bats`. | ||
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#### Test Examples | ||
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Here are some examples of common test patterns: | ||
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- Check that a value is disabled by default | ||
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``` | ||
@test "ui/Service: no type by default" { | ||
cd `chart_dir` | ||
local actual=$(helm template \ | ||
-x templates/ui-service.yaml \ | ||
. | tee /dev/stderr | | ||
yq -r '.spec.type' | tee /dev/stderr) | ||
[ "${actual}" = "null" ] | ||
} | ||
``` | ||
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In this example, nothing is changed from the default templates (no `--set` flags), then we use `yq` to retrieve the value we're checking, `.spec.type`. | ||
This output is then compared against our expected value (`null` in this case) in the assertion `[ "${actual}" = "null" ]`. | ||
- Check that a template value is rendered to a specific value | ||
``` | ||
@test "ui/Service: specified type" { | ||
cd `chart_dir` | ||
local actual=$(helm template \ | ||
-x templates/ui-service.yaml \ | ||
--set 'ui.service.type=LoadBalancer' \ | ||
. | tee /dev/stderr | | ||
yq -r '.spec.type' | tee /dev/stderr) | ||
[ "${actual}" = "LoadBalancer" ] | ||
} | ||
``` | ||
This is very similar to the last example, except we've changed a default value with the `--set` flag and correspondingly changed the expected value. | ||
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- Check that a template value contains several values | ||
``` | ||
@test "syncCatalog/Deployment: to-k8s only" { | ||
cd `chart_dir` | ||
local actual=$(helm template \ | ||
-x templates/sync-catalog-deployment.yaml \ | ||
--set 'syncCatalog.enabled=true' \ | ||
--set 'syncCatalog.toConsul=false' \ | ||
. | tee /dev/stderr | | ||
yq '.spec.template.spec.containers[0].command | any(contains("-to-consul=false"))' | tee /dev/stderr) | ||
[ "${actual}" = "true" ] | ||
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local actual=$(helm template \ | ||
-x templates/sync-catalog-deployment.yaml \ | ||
--set 'syncCatalog.enabled=true' \ | ||
--set 'syncCatalog.toConsul=false' \ | ||
. | tee /dev/stderr | | ||
yq '.spec.template.spec.containers[0].command | any(contains("-to-k8s"))' | tee /dev/stderr) | ||
[ "${actual}" = "false" ] | ||
} | ||
``` | ||
In this case, the same command is run twice in the same test. | ||
This can be used to look for several things in the same field, or to check that something is not present that shouldn't be. | ||
*Note:* If testing more than two conditions, it would be good to separate the `helm template` part of the command from the `yq` sections to reduce redundant work. | ||
- Check that an entire template file is not rendered | ||
``` | ||
@test "syncCatalog/Deployment: disabled by default" { | ||
cd `chart_dir` | ||
local actual=$(helm template \ | ||
-x templates/sync-catalog-deployment.yaml \ | ||
. | tee /dev/stderr | | ||
yq 'length > 0' | tee /dev/stderr) | ||
[ "${actual}" = "false" ] | ||
} | ||
``` | ||
Here we are check the length of the command output to see if the anything is rendered. | ||
This style can easily be switched to check that a file is rendered instead. |
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