Version: Next

Testing Definitions

Write Go unit tests for your definitions using defkit's test helpers and Gomega matchers. Unit tests run entirely in-process and do not require a cluster; E2E tests require a live KubeVela cluster.

Unit Testing

`defkit.TestContext()`

Creates a test context with runtime values and parameter overrides for unit-testing definitions without a cluster.

Go — defkit
ctx := defkit.TestContext().
    WithName("my-app").
    WithNamespace("production").
    WithParam("image", "nginx:1.21").
    WithParam("replicas", 3).
    WithAppRevision("v2").
    WithClusterVersion(1, 28)

Available methods:

Method	Description
`.WithName(name)`	Component name
`.WithNamespace(ns)`	Application namespace
`.WithParam(key, value)`	Set a parameter value
`.WithAppRevision(rev)`	App revision string
`.WithClusterVersion(maj, min)`	Kubernetes version

`comp.Render(ctx)`

Renders a component definition against a test context, producing the concrete Kubernetes resource map.

Go — defkit
rendered := comp.Render(
    defkit.TestContext().WithName("myapp"),
)

apiVersion := rendered.APIVersion()
kind        := rendered.Kind()
data        := rendered.Data()
name        := data["metadata"].(map[string]any)["name"]

With Ginkgo/Gomega
It("should render with context", func() {
    rendered := comp.Render(
        defkit.TestContext().WithName("myapp"),
    )

    Expect(rendered.APIVersion()).To(Equal("apps/v1"))
    Expect(rendered.Kind()).To(Equal("Deployment"))

    data := rendered.Data()
    Expect(data["metadata"].(map[string]any)["name"]).
        To(Equal("myapp"))
})

Accessor Methods

Read-only accessors used in tests to inspect the definition structure without rendering.

Go — defkit
comp := defkit.NewComponent("webservice").
    Workload("apps/v1", "Deployment").
    Params(image, replicas).
    Template(myTemplate)

comp.GetName()
comp.GetDescription()
comp.GetWorkload()
comp.GetParams()
comp.GetPlacement()

tpl := defkit.NewTemplate()
comp.GetTemplate()(tpl)

tpl.GetOutput()
tpl.GetOutputs()

In Ginkgo tests
It("should have correct metadata", func() {
    Expect(comp.GetName()).To(Equal("webservice"))
    Expect(comp.GetDescription()).To(Equal("Web service"))
    Expect(comp.GetWorkload().Kind()).To(Equal("Deployment"))
})

It("should have required image param", func() {
    Expect(comp.GetParams()).To(HaveLen(2))
    Expect(comp.GetParams()[0]).To(BeRequired())
})

It("should produce a Deployment output", func() {
    tpl := defkit.NewTemplate()
    comp.GetTemplate()(tpl)
    Expect(tpl.GetOutput()).To(BeDeployment())
})

Gomega Matchers

Import from github.com/oam-dev/kubevela/pkg/definition/defkit/testing/matchers.

Resource Kind & Version Matchers

Go — import
import (
    . "github.com/onsi/gomega"
    . "github.com/oam-dev/kubevela/pkg/definition/defkit/testing/matchers"
)

r := defkit.NewResource("apps/v1", "Deployment")

Expect(r).To(BeDeployment())
Expect(r).To(BeService())
Expect(r).To(BeConfigMap())
Expect(r).To(BeSecret())
Expect(r).To(BeIngress())
Expect(r).To(BeResourceOfKind("Deployment"))
Expect(r).To(HaveAPIVersion("apps/v1"))

Template assertions
tpl := defkit.NewTemplate()
comp.GetTemplate()(tpl)

output := tpl.GetOutput()
Expect(output).To(BeDeployment())
Expect(output).To(HaveAPIVersion("apps/v1"))

outputs := tpl.GetOutputs()
Expect(outputs).To(HaveKey("service"))
Expect(outputs["service"]).To(BeService())

Operation Matchers

Assert that specific .Set() operations exist on a resource builder, and check the total number of operations.

Go — defkit
image    := defkit.String("image")
replicas := defkit.Int("replicas")

r := defkit.NewResource("apps/v1", "Deployment").
    Set("spec.template.spec.containers[0].image", image).
    Set("spec.replicas", replicas)

Expect(r).To(HaveSetOp("spec.template.spec.containers[0].image"))
Expect(r).NotTo(HaveSetOp("spec.volumes"))
Expect(r).To(HaveOpCount(2))

tip

Operation matchers check the builder's internal operation list — they don't require rendering the full template with a context. Use them for fast checks that verify a field is wired to a param.

Parameter Matchers

Go — defkit
Expect(defkit.String("token").Required()).To(BeRequired())
Expect(defkit.String("tag").Optional()).To(BeOptional())

Expect(defkit.Int("replicas").Default(3)).To(HaveDefaultValue(3))
Expect(defkit.String("tag").Default("latest")).To(HaveDefaultValue("latest"))

Expect(defkit.String("image").Description("Container image")).
    To(HaveDescription("Container image"))

comp := defkit.NewComponent("test").
    Params(
        defkit.String("image"),
        defkit.Int("replicas").Default(1),
    )

Expect(comp).To(HaveParamNamed("image"))
Expect(comp).To(HaveParamNamed("replicas"))
Expect(comp).NotTo(HaveParamNamed("cpu"))

Testing Placement

Test placement constraints by evaluating them against mock cluster labels using placement.Evaluate().

Go — Ginkgo test
import "github.com/oam-dev/kubevela/pkg/definition/defkit/placement"

It("should be eligible on AWS EKS clusters", func() {
    comp := defkit.NewComponent("aws-only").
        RunOn(placement.Label("provider").Eq("aws"))

    spec := comp.GetPlacement()
    result := placement.Evaluate(spec, map[string]string{
        "provider": "aws",
    })
    Expect(result.Eligible).To(BeTrue())
})

It("should be ineligible on GCP clusters", func() {
    comp := defkit.NewComponent("aws-only").
        RunOn(placement.Label("provider").Eq("aws"))

    spec := comp.GetPlacement()
    result := placement.Evaluate(spec, map[string]string{
        "provider": "gcp",
    })
    Expect(result.Eligible).To(BeFalse())
})

placement.Evaluate() returns a result with two fields:

Field	Type	Description
`result.Eligible`	`bool`	Whether the cluster matches
`result.Reason`	`string`	Explanation of the decision

Complete Unit Test Example

Go — full test file
var _ = Describe("Webservice Component", func() {
    var comp *defkit.ComponentDefinition

    BeforeEach(func() {
        image    := defkit.String("image")
        replicas := defkit.Int("replicas").Default(1)

        comp = defkit.NewComponent("webservice").
            Workload("apps/v1", "Deployment").
            Params(image, replicas).
            Template(func(tpl *defkit.Template) {
                vela := defkit.VelaCtx()
                tpl.Output(
                    defkit.NewResource("apps/v1", "Deployment").
                        Set("metadata.name", vela.Name()).
                        Set("spec.replicas", replicas),
                )
            })
    })

    It("should have correct metadata", func() {
        Expect(comp.GetName()).To(Equal("webservice"))
        Expect(comp.GetWorkload().Kind()).To(Equal("Deployment"))
    })

    It("should require image", func() {
        Expect(comp).To(HaveParamNamed("image"))
        Expect(comp.GetParams()[0]).To(BeRequired())
    })

    It("should produce a Deployment", func() {
        tpl := defkit.NewTemplate()
        comp.GetTemplate()(tpl)
        Expect(tpl.GetOutput()).To(BeDeployment())
        Expect(tpl.GetOutput()).To(HaveSetOp("metadata.name"))
        Expect(tpl.GetOutput()).To(HaveOpCount(2))
    })

    It("should generate valid CUE", func() {
        cue := comp.ToCue()
        Expect(cue).To(ContainSubstring(`type: "component"`))
        Expect(cue).To(ContainSubstring(`image: string`))
        Expect(cue).To(ContainSubstring(`replicas: *1 | int`))
    })
})

E2E Testing

E2E tests run against a live KubeVela cluster using YAML fixtures from test/builtin-definition-example/.

make targets
make test-e2e

make test-e2e-components
make test-e2e-traits
make test-e2e-policies
make test-e2e-workflowsteps

PROCS=10 E2E_TIMEOUT=10m make test-e2e-components

TESTDATA_PATH=test/my-fixtures make test-e2e

Fixture directory structure:

test/builtin-definition-example/
  components/      # Label("components") in Ginkgo
  traits/          # Label("traits")
  policies/        # Label("policies")
  workflowsteps/   # Label("workflowsteps")

Each YAML file is a complete Application spec that exercises the definition. Tests poll for Application readiness. Each test gets an isolated namespace e2e-<sanitized-app-name>.

Running Tests

go test
go test ./...

go test -v ./...

go test ./components/... -run TestWebService
go test ./traits/... -run TestEnv

make test-unit

Ginkgo CLI
make install-ginkgo

ginkgo -v ./components/...
ginkgo -v ./traits/...

ginkgo --label-filter=components ./test/e2e/...
ginkgo --label-filter=traits     ./test/e2e/...

Unit Testing​

defkit.TestContext()​

comp.Render(ctx)​

Accessor Methods​

Gomega Matchers​

Resource Kind & Version Matchers​

Operation Matchers​

Parameter Matchers​

Testing Placement​

Complete Unit Test Example​

E2E Testing​

Running Tests​