new: colorize mock errors

checker/response_body/response_body.go

@@ -24,7 +24,7 @@ func createWrongStatusError(statusCode int, known map[int]string) error {
 	for code := range known {
 		knownCodes = append(knownCodes, fmt.Sprintf("%d", code))
 	}
-	return colorize.NewNotEqualError("server responded with unexpected ", "status", ":", strings.Join(knownCodes, " / "), statusCode, nil)
+	return colorize.NewNotEqualError("server responded with unexpected %s:", "status", strings.Join(knownCodes, " / "), statusCode)
 }
 
 func (c *responseBodyChecker) Check(t models.TestInterface, result *models.Result) ([]error, error) {

checker/response_db/response_db.go

@@ -122,30 +122,25 @@ func compareDbResponseLength(expected, actual []string, query interface{}) error
 	diffCfg.Diffable = true
 	chunks := diff.DiffChunks(strings.Split(diffCfg.Sprint(expected), "\n"), strings.Split(diffCfg.Sprint(actual), "\n"))
 
-	tail := []*colorize.Part{
+	tail := []colorize.Part{
 		colorize.None("\n\n   query: "),
 		colorize.Cyan(query),
 		colorize.None("\n   diff (--- expected vs +++ actual):\n"),
 	}
 	tail = append(tail, colorize.MakeColorDiff(chunks)...)
 
 	return colorize.NewNotEqualError(
-		"quantity of ",
+		"quantity of %s do not match:",
 		"items in database",
-		" do not match:",
 		len(expected),
 		len(actual),
-		tail,
-	)
+	).AddParts(tail...)
 
 	return colorize.NewError(
-		colorize.None("quantity of items in database do not match (-expected: "),
+		"quantity of items in database do not match (-expected: %s +actual: %s)\n     test query:\n%s\n    result diff:\n%s",
 		colorize.Cyan(len(expected)),
-		colorize.None(" +actual: "),
 		colorize.Cyan(len(actual)),
-		colorize.None(")\n     test query:\n"),
 		colorize.Cyan(query),
-		colorize.None("\n    result diff:\n"),
 		colorize.Cyan(pretty.Compare(expected, actual)),
 	)
 }

checker/response_header/response_header.go

@@ -27,7 +27,7 @@ func (c *responseHeaderChecker) Check(t models.TestInterface, result *models.Res
 		actualValues, ok := result.ResponseHeaders[k]
 		if !ok {
 			errs = append(errs, colorize.NewError(
-				colorize.None("response does not include expected header "),
+				"response does not include expected header %s",
 				colorize.Cyan(k),
 			))
 			continue
@@ -44,16 +44,15 @@ func (c *responseHeaderChecker) Check(t models.TestInterface, result *models.Res
 		}
 		if len(actualValues) == 1 {
 			errs = append(errs, colorize.NewNotEqualError(
-				"response header ", k, " value does not match:",
+				"response header %s value does not match:",
+				k,
 				v,
 				actualValues[0],
-				nil,
 			))
 		} else {
 			errs = append(errs, colorize.NewError(
-				colorize.None("response header "),
+				"response header %s value does not match expected %s",
 				colorize.Cyan(k),
-				colorize.None(" value does not match expected "),
 				colorize.Green(v),
 			))
 		}

checker/response_header/response_header_test.go

@@ -73,8 +73,8 @@ func TestCheckWhenNotMatchedShouldReturnError(t *testing.T) {
 		t,
 		errText,
 		[]string{
-			"response does not include expected header Content-Type",
-			"response header Accept value does not match:\n     expected: text/html\n       actual: application/json",
+			"response does not include expected header 'Content-Type'",
+			"response header 'Accept' value does not match:\n     expected: text/html\n       actual: application/json",
 		},
 	)
 }

colorize/diff.go

@@ -2,13 +2,12 @@ package colorize
 
 import (
 	"fmt"
-	"strings"
 
 	"github.com/kylelemons/godebug/diff"
 )
 
-func MakeColorDiff(chunks []diff.Chunk) []*Part {
-	parts := []*Part{}
+func MakeColorDiff(chunks []diff.Chunk) []Part {
+	parts := []Part{}
 	for _, c := range chunks {
 		for _, line := range c.Added {
 			parts = append(parts, Red(fmt.Sprintf("+%s\n", line)))
@@ -20,8 +19,5 @@ func MakeColorDiff(chunks []diff.Chunk) []*Part {
 			parts = append(parts, None(fmt.Sprintf(" %s\n", line)))
 		}
 	}
-	if len(parts) != 0 {
-		parts[len(parts)-1].value = strings.TrimRight(parts[len(parts)-1].value, "\n")
-	}
 	return parts
 }

colorize/error.go

@@ -1,50 +1,51 @@
 package colorize
 
 import (
+	"errors"
 	"fmt"
 	"strings"
 
 	"github.com/fatih/color"
 )
 
-type Color int
+func Red(v interface{}) Part {
+	return &partImpl{color.HiRedString, fmt.Sprintf("%v", v), false}
+}
 
-const (
-	ColorRed Color = iota
-	ColorCyan
-	ColorGreen
-	ColorNone
-)
+func Cyan(v interface{}) Part {
+	return &partImpl{color.HiCyanString, fmt.Sprintf("%v", v), true}
+}
 
-type Part struct {
-	attr  Color
-	value string
+func Green(v interface{}) Part {
+	return &partImpl{color.HiGreenString, fmt.Sprintf("%v", v), false}
 }
 
-func Red(v interface{}) *Part {
-	return &Part{ColorRed, fmt.Sprintf("%v", v)}
+func None(v interface{}) Part {
+	return &partImpl{asIsString, fmt.Sprintf("%v", v), false}
 }
 
-func Cyan(v interface{}) *Part {
-	return &Part{ColorCyan, fmt.Sprintf("%v", v)}
+func SubError(err error) Part {
+	return &subErrorImpl{err}
 }
 
-func Green(v interface{}) *Part {
-	return &Part{ColorGreen, fmt.Sprintf("%v", v)}
+type Error struct {
+	parts []Part
 }
 
-func None(v interface{}) *Part {
-	return &Part{ColorNone, fmt.Sprintf("%v", v)}
+func (e *Error) AddParts(values ...Part) *Error {
+	e.parts = append(e.parts, values...)
+	return e
 }
 
-type Error struct {
-	parts []*Part
+func (e *Error) SetSubError(err error) *Error {
+	e.AddParts(SubError(err))
+	return e
 }
 
 func (e *Error) Error() string {
 	buf := strings.Builder{}
 	for _, p := range e.parts {
-		buf.WriteString(p.value)
+		buf.WriteString(p.Text())
 	}
 	return buf.String()
 }
@@ -56,32 +57,56 @@ func asIsString(format string, a ...interface{}) string {
 func (e *Error) ColorError() string {
 	buf := strings.Builder{}
 	for _, p := range e.parts {
-		if p.value == "" {
-			continue
+		buf.WriteString(p.ColorText())
+	}
+	return buf.String()
+}
+
+func alternateJoin(list1, list2 []Part) []Part {
+	result := []Part{}
+	i, j := 0, 0
+	for len(result) != len(list1)+len(list2) {
+		if i < len(list1) {
+			result = append(result, list1[i])
+			i++
 		}
-		f := asIsString
-		switch p.attr {
-		case ColorRed:
-			f = color.RedString
-		case ColorCyan:
-			f = color.CyanString
-		case ColorGreen:
-			f = color.GreenString
+		if j < len(list2) {
+			result = append(result, list2[j])
+			j++
 		}
+	}
+
+	return result
+}
 
-		buf.WriteString(f(p.value))
+func GetColoredValue(err error) string {
+	var pErr *Error
+	if errors.As(err, &pErr) {
+		return pErr.ColorError()
 	}
-	return buf.String()
+	return err.Error()
+}
+
+func NewError(format string, values ...Part) *Error {
+	plain := []Part{}
+	for _, s := range strings.Split(format, "%s") {
+		plain = append(plain, None(s))
+	}
+	return &Error{alternateJoin(plain, values)}
+}
+
+func NewEntityError(pattern, entity string) *Error {
+	return NewError(pattern, Cyan(entity))
 }
 
-func NewError(parts ...*Part) error {
-	return &Error{parts}
+func NewNotEqualError(pattern, entity string, expected, actual interface{}) *Error {
+	pattern += "\n     expected: %s\n       actual: %s"
+	return NewError(pattern, Cyan(entity), Green(expected), Red(actual))
 }
 
-func NewNotEqualError(before, entity, after string, expected, actual interface{}, tail []*Part) error {
-	parts := []*Part{
+func NewNotEqualError2(before, entity, after string, expected, actual interface{}) *Error {
+	parts := []Part{
 		None(before), Cyan(entity), None(after + "\n     expected: "), Green(expected), None("\n       actual: "), Red(actual),
 	}
-	parts = append(parts, tail...)
-	return NewError(parts...)
+	return NewError("", parts...)
 }

colorize/part.go

@@ -0,0 +1,35 @@
+package colorize
+
+type Part interface {
+	Text() string
+	ColorText() string
+}
+
+type partImpl struct {
+	colorer func(format string, a ...interface{}) string
+	value   string
+	entity  bool
+}
+
+func (p *partImpl) Text() string {
+	if p.entity {
+		return "'" + p.value + "'"
+	}
+	return p.value
+}
+
+func (p *partImpl) ColorText() string {
+	return p.colorer(p.value)
+}
+
+type subErrorImpl struct {
+	err error
+}
+
+func (p *subErrorImpl) Text() string {
+	return ": " + p.err.Error()
+}
+
+func (p *subErrorImpl) ColorText() string {
+	return ": " + GetColoredValue(p.err)
+}

compare/compare.go

@@ -219,7 +219,7 @@ func leafMatchType(expected interface{}) leafsMatchType {
 	return pure
 }
 
-func diffStrings(a, b string) []*colorize.Part {
+func diffStrings(a, b string) []colorize.Part {
 	chunks := diff.DiffChunks(strings.Split(a, "\n"), strings.Split(b, "\n"))
 	return colorize.MakeColorDiff(chunks)
 }
@@ -232,18 +232,16 @@ func makeValueCompareError(path, msg string, expected, actual interface{}) error
 	}
 
 	// special case for multi-line strings
-	parts := []*colorize.Part{
-		colorize.None("at path "),
+	parts := []colorize.Part{
 		colorize.Cyan(path),
-		colorize.None(" " + msg + ":\n     diff (--- expected vs +++ actual):\n"),
 	}
 
 	parts = append(parts, diffStrings(actualStr, expectedStr)...)
-	return colorize.NewError(parts...)
+	return colorize.NewError("at path %s "+msg+":\n     diff (--- expected vs +++ actual):\n", parts...)
 }
 
 func makeError(path, msg string, expected, actual interface{}) error {
-	return colorize.NewNotEqualError("at path ", path, " "+msg+":", expected, actual, nil)
+	return colorize.NewNotEqualError("at path %s "+msg+":", path, expected, actual)
 }
 
 func convertToArray(array interface{}) []interface{} {

compare/compare_test.go

@@ -10,7 +10,7 @@ import (
 
 func makeErrorString(path, msg string, expected, actual interface{}) string {
 	return fmt.Sprintf(
-		"at path %s %s:\n     expected: %v\n       actual: %v",
+		"at path '%s' %s:\n     expected: %v\n       actual: %v",
 		path,
 		msg,
 		expected,

go.mod

@@ -12,7 +12,6 @@ require (
 	github.com/tidwall/gjson v1.17.0
 	golang.org/x/sync v0.4.0
 	gopkg.in/yaml.v2 v2.4.0
-	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
@@ -22,4 +21,5 @@ require (
 	github.com/tidwall/match v1.1.1 // indirect
 	github.com/tidwall/pretty v1.2.0 // indirect
 	golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

mocks/constraint_body_json_field_matches_json.go

@@ -2,10 +2,11 @@ package mocks
 
 import (
 	"encoding/json"
-	"fmt"
 	"net/http"
 
+	"github.com/lansfy/gonkex/colorize"
 	"github.com/lansfy/gonkex/compare"
+
 	"github.com/tidwall/gjson"
 )
 
@@ -58,10 +59,10 @@ func (c *bodyJSONFieldMatchesJSONConstraint) Verify(r *http.Request) []error {
 
 	value := gjson.Get(string(body), c.path)
 	if !value.Exists() {
-		return []error{fmt.Errorf("json field %s does not exist", c.path)}
+		return []error{colorize.NewEntityError("json field %s does not exist", c.path)}
 	}
 	if value.String() == "" {
-		return []error{fmt.Errorf("json field %s is empty", c.path)}
+		return []error{colorize.NewEntityError("json field %s is empty", c.path)}
 	}
 
 	var actual interface{}

mocks/constraint_body_matches_json.go

@@ -2,7 +2,7 @@ package mocks
 
 import (
 	"encoding/json"
-	"fmt"
+	"errors"
 	"net/http"
 
 	"github.com/lansfy/gonkex/compare"
@@ -50,7 +50,7 @@ func (c *bodyMatchesJSONConstraint) Verify(r *http.Request) []error {
 	}
 
 	if len(body) == 0 {
-		return []error{fmt.Errorf("request is empty")}
+		return []error{errors.New("request is empty")}
 	}
 	var actual interface{}
 	err = json.Unmarshal(body, &actual)