Kubernetes控制器的单元测试

Question

I'm trying to write a controller and I'm having a few issues writing tests.

I've used some code from the k8s HPA in my controller and I'm seeing something weird when using the testrestmapper.

basically when running this test with a breakpoint here I see the mappings are returned.

When I do the same the mappings are not returned.

What magic is happening here?

The following test fails

package main

import (
    "github.com/stretchr/testify/assert"
    "k8s.io/apimachinery/pkg/api/meta/testrestmapper"
    "k8s.io/apimachinery/pkg/runtime/schema"
    "k8s.io/kubernetes/pkg/api/legacyscheme"
    "testing"
)

func TestT(t *testing.T) {
    mapper := testrestmapper.TestOnlyStaticRESTMapper(legacyscheme.Scheme)

    gk := schema.FromAPIVersionAndKind("apps/v1", "Deployment").GroupKind()
    mapping, err := mapper.RESTMapping(gk)

    assert.NoError(t, err)
    assert.NotNil(t, mapping)
}

Answer 1

I think this is because you are missing an import of _ "k8s.io/kubernetes/pkg/apis/apps/install".

Without importing this path, there are no API groups or versions registered with the schema you are using to obtain the REST mapping.

By importing the path, the API group will be registered, allowing the call to schema.FromAPIVersionAndKind("apps/v1", "Deployment").GroupKind() to return a valid GroupKind.