Read golden files.

Author: rzajac

.gitignore

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+.idea/

LICENSE

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README.md

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+## Simple golden file test helper for HTTP responses.
+
+Check text response is the same as the one in the golden file. 
+

go.mod

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+module github.com/rzajac/golden
+
+go 1.15
+
+require github.com/stretchr/testify v1.6.1

go.sum

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+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
+github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

golden.go

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+package golden
+
+import (
+	"bufio"
+	"bytes"
+	"net/http"
+	"net/textproto"
+	"net/url"
+	"os"
+	"strings"
+	"testing"
+)
+
+// Golden file sections.
+const (
+	secVerb   = "Verb::"
+	secPath   = "Path::"
+	secQuery  = "Query::"
+	secHeader = "Header::"
+	secBody   = "Body::"
+)
+
+// fatalFn is a function signature for reporting fatal errors.
+// It is only used in Golden structure testing that's why it's not exported.
+type fatalFn func(args ...interface{})
+
+// Opt represents function signature for Golden constructor.
+type Opt func(gld *Golden)
+
+// Golden represents golden file.
+type Golden struct {
+	Verb       string       // HTTP verb.
+	VerbSet    bool         // Set to true when Verb was set in golden file.
+	Path       string       // HTTP path.
+	PathSet    bool         // Set to true when Path was set in golden file.
+	Query      url.Values   // HTTP query.
+	QuerySet   bool         // Set to true when Query was set in golden file.
+	Headers    http.Header  // HTTP headers.
+	HeadersSet bool         // Set to true when Headers were set in golden file.
+	Body       bytes.Buffer // HTTP body.
+	BodySet    bool         // Set to true when Body was set in golden file.
+	fatal      fatalFn
+}
+
+// New reads golden file at pth and creates new instance of Golden.
+func New(t *testing.T, pth string, opts ...Opt) *Golden {
+	t.Helper()
+
+	gld := &Golden{
+		fatal:   t.Fatal,
+		Headers: make(http.Header, 0),
+	}
+
+	for _, opt := range opts {
+		opt(gld)
+	}
+
+	fil, err := os.Open(pth)
+	if err != nil {
+		gld.fatal(err)
+	}
+
+	scn := bufio.NewScanner(fil)
+	for scn.Scan() {
+		if err := gld.processLine(scn.Text()); err != nil {
+			gld.fatal(err)
+		}
+	}
+
+	if err := scn.Err(); err != nil {
+		gld.fatal(err)
+	}
+
+	return gld
+}
+
+func (gld *Golden) processLine(lin string) error {
+	var err error
+
+	if gld.BodySet {
+		gld.Body.WriteString(lin + "\n")
+		return nil
+	}
+
+	switch {
+	case strings.HasPrefix(lin, secVerb):
+		gld.Verb = lin[len(secVerb):]
+		gld.VerbSet = true
+
+	case strings.HasPrefix(lin, secPath):
+		gld.Path = lin[len(secPath):]
+		gld.PathSet = true
+
+	case strings.HasPrefix(lin, secQuery):
+		if gld.Query, err = url.ParseQuery(lin[len(secQuery):]); err != nil {
+			return err
+		}
+		gld.QuerySet = true
+
+	case strings.HasPrefix(lin, secHeader):
+		if err := addHeader(gld.Headers, lin[len(secHeader):]); err != nil {
+			return err
+		}
+		gld.HeadersSet = true
+
+	case strings.HasPrefix(lin, secBody):
+		gld.Body.WriteString(lin[len(secBody):])
+		gld.BodySet = true
+
+	case strings.HasPrefix(lin, "#"):
+		// Do nothing.
+	}
+
+	return nil
+}
+
+func addHeader(hs http.Header, lin string) error {
+	hr := bufio.NewReader(strings.NewReader(lin + "\r\n\r\n"))
+	tp := textproto.NewReader(hr)
+	h, err := tp.ReadMIMEHeader()
+	if err != nil {
+		return err
+	}
+	for key, vv := range h {
+		for _, v := range vv {
+			hs.Add(key, v)
+		}
+	}
+	return nil
+}