Terratest Helm Charts 在 Go 单元测试中失败

php小编草莓发现，Terratest Helm Charts 在 Go 单元测试中经常遇到失败的问题。Terratest 是一个用于编写自动化、可重复的基础设施测试的 Go 语言库，而 Helm Charts 则是 Kubernetes 的包管理工具。在使用 Terratest 进行 Helm Charts 的单元测试时，有时会出现各种各样的问题，导致测试失败。本文将探讨这些问题的原因，并提供相应的解决方案，帮助开发者更好地应对这些挑战。无论是初学者还是有经验的开发者，都能从本文中获得有益的知识和技巧。

问题内容

我正在尝试使用 terratest 对我的 helm 图表进行单元测试，但遇到了一个奇怪的错误：

这是我的单元测试：

package grafana

import (
    "fmt"

    "testing"

    corev1 "k8s.io/api/core/v1"

    "github.com/gruntwork-io/terratest/modules/helm"
)

func testgrafanahelmcharttemplate(t *testing.t) {
    // path to the helm chart we will test
    helmchartgrafanapath := "../../../open-electrons-monitoring"

    // setup the args. for this test, we will set the following input values:
    // - image=grafana:latest
    options := &helm.options{
        setvalues: map[string]string{"image": "grafana:latest"},
    }

    // run rendertemplate to render the template and capture the output.
    output := helm.rendertemplate(t, options, helmchartgrafanapath, "pod", []string{"templates/grafana/grafana-deployment.yml"})

    // now we use kubernetes/client-go library to render the template output into the pod struct. this will
    // ensure the pod resource is rendered correctly.
    var pod corev1.pod
    helm.unmarshalk8syaml(t, output, &pod)

    // finally, we verify the pod spec is set to the expected container image value
    expectedcontainerimage := "grafana:latest"
    podcontainers := pod.spec.containers
    fmt.print(pod.spec)
    fmt.print("*********************************************************")
    if podcontainers[0].image != expectedcontainerimage {
        t.fatalf("rendered container image (%s) is not expected (%s)", podcontainers[0].image, expectedcontainerimage)
    }
}

以下是部署的输出：

testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66: apiversion: apps/v1
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66: kind: deployment
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66: metadata:
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:   name: grafana-open-electrons-monitoring
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:   namespace: open-electrons-monitoring-ns
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:   labels:
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:     app.kubernetes.io/name: open-electrons-grafana
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:     app.kubernetes.io/component: monitoring
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:     app.kubernetes.io/part-of: open-electrons-grafana
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:     app.kubernetes.io/managed-by: helm
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:     app.kubernetes.io/instance: open-electrons-grafana
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:     app.kubernetes.io/version: refs/tags/v0.0.11 # todo: better use the grafana version
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66: spec:
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:   replicas: 1
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:   selector:
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:     matchlabels:
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:       app: open-electrons-grafana
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:   strategy:
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:     rollingupdate:
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:       maxsurge: 1
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:       maxunavailable: 1
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:     type: rollingupdate
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:   template:
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:     metadata:
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:       creationtimestamp: null
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:       labels:
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:         name: open-electrons-grafana
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:     spec:
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:       securitycontext:
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:         runasuser: 1000
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:         runasgroup: 3000
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:         fsgroup: 2000
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:         runasnonroot: true
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:       containers:
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:         - image: grafana/grafana:latest
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:           imagepullpolicy: ifnotpresent
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:           name: open-electrons-grafana
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:           ports:
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:             - containerport: 3000
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:               protocol: tcp
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:           resources:
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:             limits:
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:               memory: "1gi"
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:               cpu: "1000m"
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:             requests:
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:               memory: 500m
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:               cpu: "500m"
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:           volumemounts:
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:             - mountpath: /var/lib/grafana
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:               name: grafana-storage
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:             - mountpath: /etc/grafana/provisioning/datasources
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:               name: grafana-datasources
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:               readonly: false
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:       restartpolicy: always
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:       terminationgraceperiodseconds: 30
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:       volumes:
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:         - name: grafana-storage
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:           emptydir: {}
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:         - name: grafana-datasources
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:           configmap:
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:             defaultmode: 420
testgrafanahelmcharttemplate 2023-02-12t18:59:01+01:00 logger.go:66:             name: grafana-datasources
{[] [] [] []  <nil> <nil>  map[]   <nil>  false false false <nil> nil []   nil  [] []  <nil> nil [] <nil> <nil> <nil> map[] [] <nil>}*********************************************************--- fail: testgrafanahelmcharttemplate (0.06s)

这是输出：

panic: runtime error: index out of range [0] with length 0 [recovered]
    panic: runtime error: index out of range [0] with length 0

goroutine 5 [running]:
testing.tRunner.func1.2({0x1440620, 0xc0002a85b8})
    /usr/local/go/src/testing/testing.go:1526 +0x24e
testing.tRunner.func1()
    /usr/local/go/src/testing/testing.go:1529 +0x39f
panic({0x1440620, 0xc0002a85b8})
    /usr/local/go/src/runtime/panic.go:884 +0x213

为什么会失败？我在这里缺少什么？

解决方法

我设法把它修好了。导入应该是这样的：

appsv1 "k8s.io/api/apps/v1"

然后我必须修改 deployment 对象的实例化：

var deployment appsv1.Deployment

而不是 pod 对象。

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