Use jsondiff (#59)

* feat: use nsf/jsondiff

* chore: update go.mod

Author: podhmo

go.mod

@@ -1,6 +1,7 @@
 module github.com/podhmo/go-webtest
 
 require (
+	github.com/nsf/jsondiff v0.0.0-20190712045011-8443391ee9b6
 	github.com/pkg/errors v0.8.1
 	github.com/podhmo/go-rfc3339 v0.1.0
 	github.com/podhmo/noerror v0.2.0

go.sum

@@ -1,3 +1,5 @@
+github.com/nsf/jsondiff v0.0.0-20190712045011-8443391ee9b6 h1:qsqscDgSJy+HqgMTR+3NwjYJBbp1+honwDsszLoS+pA=
+github.com/nsf/jsondiff v0.0.0-20190712045011-8443391ee9b6/go.mod h1:uFMI8w+ref4v2r9jz+c9i1IfIttS/OkmLfrk1jne5hs=
 github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/podhmo/go-rfc3339 v0.1.0 h1:WzY1Kk+j9LSKKxvoZBm/FHx+DVrNqNZx2rPflpZzomw=

jsonequal/fail.go

@@ -0,0 +1,36 @@
+package jsonequal
+
+import (
+	"fmt"
+
+	"github.com/nsf/jsondiff"
+)
+
+// FailPlain :
+func FailPlain(
+	left interface{},
+	right interface{},
+	lb []byte,
+	rb []byte,
+) error {
+	ls, rs := string(lb), string(rb)
+	if ls == rs {
+		msg := "not equal json\nleft (%[1]T):\n	%[3]s\nright (%[2]T):\n	%[4]s"
+		return fmt.Errorf(msg, left, right, ls, rs)
+	}
+	// todo : more redable expression
+	msg := "not equal json\nleft:\n	%[3]s\nright:\n	%[4]s"
+	return fmt.Errorf(msg, left, right, ls, rs)
+}
+
+// FailJSONDiff :
+func FailJSONDiff(
+	left interface{},
+	right interface{},
+	lb []byte,
+	rb []byte,
+) error {
+	options := jsondiff.DefaultConsoleOptions()
+	diff, s := jsondiff.Compare(lb, rb, &options)
+	return fmt.Errorf("%s\n%s\n%s", diff.String(), s, FailPlain(left, right, lb, rb).Error())
+}

jsonequal/jsonequal.go

@@ -2,7 +2,6 @@ package jsonequal
 
 import (
 	"encoding/json"
-	"fmt"
 	"io"
 	"reflect"
 
@@ -106,7 +105,7 @@ func ShouldBeSame(
 		caller.WrapfFunc = errors.WithMessagef
 	}
 	if caller.FailFunc == nil {
-		caller.FailFunc = defaultFail
+		caller.FailFunc = FailJSONDiff
 	}
 
 	lv, lb, err := lsrc()
@@ -132,19 +131,3 @@ func Equal(
 ) bool {
 	return ShouldBeSame(lsrc, rsrc, options...) == nil
 }
-
-func defaultFail(
-	left interface{},
-	right interface{},
-	lb []byte,
-	rb []byte,
-) error {
-	ls, rs := string(lb), string(rb)
-	if ls == rs {
-		msg := "not equal json\nleft (%[1]T):\n	%[3]s\nright (%[2]T):\n	%[4]s"
-		return fmt.Errorf(msg, left, right, ls, rs)
-	}
-	// todo : more redable expression
-	msg := "not equal json\nleft:\n	%[3]s\nright:\n	%[4]s"
-	return fmt.Errorf(msg, left, right, ls, rs)
-}