Golang - 覆盖所有用例的文本/模板单元测试

Question

我有以下示例(类似于我们在 prod 中的示例)“文本/模板”代码可以正常工作，现在我想为其创建一个单元测试来检查函数以及 text/模板 看看我覆盖了100% 的代码...

这里的问题是如何进行涵盖所有案例的文本/模板单元测试。我目前是文本/模板的新手，我想确保它按预期工作。

请访问: https://play.golang.org/p/203Al36Zigk

这是模板:

const tmpl = `#!/bin/bash
{{- range .File.Dependency}}
echo {{.EchoText}}
{{- range .Install}}
submitting {{.name}}
{{- end}}
{{.TypeCommand}}
{{end}}

{{- range $k, $v := .API}}
echo {{$k}}
submitting {{$v}}
{{end}}
`

Answer 1

您应该设置一个 template_test 文件，专门用于测试模板文件的输出。

为此，查看 golang text/template package 的来源总是个好主意。

作为示例(以适应您的情况)，您有 src/text/template/example_test.go它使用经典的 table-driven test方法:

package template_test

import (
    "log"
    "os"
    "strings"
    "text/template"
)

func ExampleTemplate() {
    // Define a template.
    const letter = `
Dear {{.Name}},
{{if .Attended}}
It was a pleasure to see you at the wedding.
{{- else}}
It is a shame you couldn't make it to the wedding.
{{- end}}
{{with .Gift -}}
Thank you for the lovely {{.}}.
{{end}}
Best wishes,
Josie
`

    // Prepare some data to insert into the template.
    type Recipient struct {
        Name, Gift string
        Attended   bool
    }
    var recipients = []Recipient{
        {"Aunt Mildred", "bone china tea set", true},
        {"Uncle John", "moleskin pants", false},
        {"Cousin Rodney", "", false},
    }

    // Create a new template and parse the letter into it.
    t := template.Must(template.New("letter").Parse(letter))

    // Execute the template for each recipient.
    for _, r := range recipients {
        err := t.Execute(os.Stdout, r)
        if err != nil {
            log.Println("executing template:", err)
        }
    }

    // Output:
    // Dear Aunt Mildred,
    //
    // It was a pleasure to see you at the wedding.
    // Thank you for the lovely bone china tea set.
    //
    // Best wishes,
    // Josie
    //
    // Dear Uncle John,
    //
    // It is a shame you couldn't make it to the wedding.
    // Thank you for the lovely moleskin pants.
    //
    // Best wishes,
    // Josie
    //
    // Dear Cousin Rodney,
    //
    // It is a shame you couldn't make it to the wedding.
    //
    // Best wishes,
    // Josie
}

对于断言部分，请查看 src/text/template/multi_test.go它定义了 multiParseTest作为具有模板的结构，*和预期结果，允许执行 assertions like :

result := tmpl.Root.String()
if result != test.results[i] {
    t.Errorf("%s=(%q): got\n\t%v\nexpected\n\t%v", test.name, test.input, result, test.results[i])
}