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Sam Stoelinga
2022-09-29 16:34:47 -07:00
parent a3b77e3e71
commit b624df4c39
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*.swp
*.out

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language: go
go:
- "1.15"
- "1.16"
- "1.17"
before_install:
- go get github.com/mattn/goveralls
- go get golang.org/x/tools/cover
script:
- $HOME/gopath/bin/goveralls -service=travis-pro -package github.com/go-test/deep

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# go-test/deep Changelog
## v1.0.8 released 2021-10-13
* Updated matrix to go1.15, go1.16, and go1.17
* Added SECURITY.md and GitHub code analysis
## v1.0.7 released 2020-07-11
* Fixed issue #39: Confusing diff when comparing distinct types with the same name (PR #44)
## v1.0.6 released 2020-04-21
* Added `NilMapsAreEmpty` variable which causes a nil map to equal an empty map (PR #43) (@yalegko)
## v1.0.5 released 2020-01-16
* Added `NilSlicesAreEmpty` variable which causes a nil slice to be equal to an empty slice (PR #27) (@Anaminus)
## v1.0.4 released 2019-09-15
* Added \`deep:"-"\` structure field tag to ignore field (PR #38) (@flga)
## v1.0.3 released 2019-08-18
* Fixed issue #31: panic on typed primitives that implement error interface
## v1.0.2 released 2019-07-14
* Enabled Go module (@radeksimko)
* Changed supported and tested Go versions: 1.10, 1.11, and 1.12 (dropped 1.9)
* Changed Error equality: additional struct fields are compared too (PR #29) (@andrewmostello)
* Fixed typos and ineffassign issues (PR #25) (@tariq1890)
* Fixed diff order for nil comparison (PR #16) (@gmarik)
* Fixed slice equality when slices are extracted from the same array (PR #11) (@risteli)
* Fixed test spelling and messages (PR #19) (@sofuture)
* Fixed issue #15: panic on comparing struct with anonymous time.Time
* Fixed issue #18: Panic when comparing structs with time.Time value and CompareUnexportedFields is true
* Fixed issue #21: Set default MaxDepth = 0 (disabled) (PR #23)
## v1.0.1 released 2018-01-28
* Fixed issue #12: Arrays are not properly compared (@samlitowitz)
## v1.0.0 releaesd 2017-10-27
* First release

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MIT License
Copyright 2015-2017 Daniel Nichter
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# Deep Variable Equality for Humans
[![Go Report Card](https://goreportcard.com/badge/github.com/go-test/deep)](https://goreportcard.com/report/github.com/go-test/deep) [![Build Status](https://app.travis-ci.com/go-test/deep.svg?branch=master)](https://app.travis-ci.com/go-test/deep) [![Coverage Status](https://coveralls.io/repos/github/go-test/deep/badge.svg?branch=master)](https://coveralls.io/github/go-test/deep?branch=master) [![GoDoc](https://godoc.org/github.com/go-test/deep?status.svg)](https://pkg.go.dev/github.com/go-test/deep)
This package provides a single function: `deep.Equal`. It's like [reflect.DeepEqual](http://golang.org/pkg/reflect/#DeepEqual) but much friendlier to humans (or any sentient being) for two reason:
* `deep.Equal` returns a list of differences
* `deep.Equal` does not compare unexported fields (by default)
`reflect.DeepEqual` is good (like all things Golang!), but it's a game of [Hunt the Wumpus](https://en.wikipedia.org/wiki/Hunt_the_Wumpus). For large maps, slices, and structs, finding the difference is difficult.
`deep.Equal` doesn't play games with you, it lists the differences:
```go
package main_test
import (
"testing"
"github.com/go-test/deep"
)
type T struct {
Name string
Numbers []float64
}
func TestDeepEqual(t *testing.T) {
// Can you spot the difference?
t1 := T{
Name: "Isabella",
Numbers: []float64{1.13459, 2.29343, 3.010100010},
}
t2 := T{
Name: "Isabella",
Numbers: []float64{1.13459, 2.29843, 3.010100010},
}
if diff := deep.Equal(t1, t2); diff != nil {
t.Error(diff)
}
}
```
```
$ go test
--- FAIL: TestDeepEqual (0.00s)
main_test.go:25: [Numbers.slice[1]: 2.29343 != 2.29843]
```
The difference is in `Numbers.slice[1]`: the two values aren't equal using Go `==`.

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# Security Policy
## Supported Versions
For security patches, the latest release is supported:
| Version | Supported |
| ------- | ------------------ |
| 1.0.x | :white_check_mark: |
## Reporting a Vulnerability
To report a vulnerability, [create an issue](https://github.com/go-test/deep/issues) with the _security_ label.
This project is developed and maintained by volunteers during their free time,
so there is no SLA or ETA for fixing vulnerabilities (or any issues).
Please help by submitting a PR to fix an issue.

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// Package deep provides function deep.Equal which is like reflect.DeepEqual but
// returns a list of differences. This is helpful when comparing complex types
// like structures and maps.
package deep
import (
"errors"
"fmt"
"log"
"reflect"
"strings"
)
var (
// FloatPrecision is the number of decimal places to round float values
// to when comparing.
FloatPrecision = 10
// MaxDiff specifies the maximum number of differences to return.
MaxDiff = 10
// MaxDepth specifies the maximum levels of a struct to recurse into,
// if greater than zero. If zero, there is no limit.
MaxDepth = 0
// LogErrors causes errors to be logged to STDERR when true.
LogErrors = false
// CompareUnexportedFields causes unexported struct fields, like s in
// T{s int}, to be compared when true.
CompareUnexportedFields = false
// NilSlicesAreEmpty causes a nil slice to be equal to an empty slice.
NilSlicesAreEmpty = false
// NilMapsAreEmpty causes a nil map to be equal to an empty map.
NilMapsAreEmpty = false
)
var (
// ErrMaxRecursion is logged when MaxDepth is reached.
ErrMaxRecursion = errors.New("recursed to MaxDepth")
// ErrTypeMismatch is logged when Equal passed two different types of values.
ErrTypeMismatch = errors.New("variables are different reflect.Type")
// ErrNotHandled is logged when a primitive Go kind is not handled.
ErrNotHandled = errors.New("cannot compare the reflect.Kind")
)
type cmp struct {
diff []string
buff []string
floatFormat string
}
var errorType = reflect.TypeOf((*error)(nil)).Elem()
// Equal compares variables a and b, recursing into their structure up to
// MaxDepth levels deep (if greater than zero), and returns a list of differences,
// or nil if there are none. Some differences may not be found if an error is
// also returned.
//
// If a type has an Equal method, like time.Equal, it is called to check for
// equality.
//
// When comparing a struct, if a field has the tag `deep:"-"` then it will be
// ignored.
func Equal(a, b interface{}) []string {
aVal := reflect.ValueOf(a)
bVal := reflect.ValueOf(b)
c := &cmp{
diff: []string{},
buff: []string{},
floatFormat: fmt.Sprintf("%%.%df", FloatPrecision),
}
if a == nil && b == nil {
return nil
} else if a == nil && b != nil {
c.saveDiff("<nil pointer>", b)
} else if a != nil && b == nil {
c.saveDiff(a, "<nil pointer>")
}
if len(c.diff) > 0 {
return c.diff
}
c.equals(aVal, bVal, 0)
if len(c.diff) > 0 {
return c.diff // diffs
}
return nil // no diffs
}
func (c *cmp) equals(a, b reflect.Value, level int) {
if MaxDepth > 0 && level > MaxDepth {
logError(ErrMaxRecursion)
return
}
// Check if one value is nil, e.g. T{x: *X} and T.x is nil
if !a.IsValid() || !b.IsValid() {
if a.IsValid() && !b.IsValid() {
c.saveDiff(a.Type(), "<nil pointer>")
} else if !a.IsValid() && b.IsValid() {
c.saveDiff("<nil pointer>", b.Type())
}
return
}
// If different types, they can't be equal
aType := a.Type()
bType := b.Type()
if aType != bType {
// Built-in types don't have a name, so don't report [3]int != [2]int as " != "
if aType.Name() == "" || aType.Name() != bType.Name() {
c.saveDiff(aType, bType)
} else {
// Type names can be the same, e.g. pkg/v1.Error and pkg/v2.Error
// are both exported as pkg, so unless we include the full pkg path
// the diff will be "pkg.Error != pkg.Error"
// https://github.com/go-test/deep/issues/39
aFullType := aType.PkgPath() + "." + aType.Name()
bFullType := bType.PkgPath() + "." + bType.Name()
c.saveDiff(aFullType, bFullType)
}
logError(ErrTypeMismatch)
return
}
// Primitive https://golang.org/pkg/reflect/#Kind
aKind := a.Kind()
bKind := b.Kind()
// Do a and b have underlying elements? Yes if they're ptr or interface.
aElem := aKind == reflect.Ptr || aKind == reflect.Interface
bElem := bKind == reflect.Ptr || bKind == reflect.Interface
// If both types implement the error interface, compare the error strings.
// This must be done before dereferencing because the interface is on a
// pointer receiver. Re https://github.com/go-test/deep/issues/31, a/b might
// be primitive kinds; see TestErrorPrimitiveKind.
if aType.Implements(errorType) && bType.Implements(errorType) {
if (!aElem || !a.IsNil()) && (!bElem || !b.IsNil()) {
aString := a.MethodByName("Error").Call(nil)[0].String()
bString := b.MethodByName("Error").Call(nil)[0].String()
if aString != bString {
c.saveDiff(aString, bString)
return
}
}
}
// Dereference pointers and interface{}
if aElem || bElem {
if aElem {
a = a.Elem()
}
if bElem {
b = b.Elem()
}
c.equals(a, b, level+1)
return
}
switch aKind {
/////////////////////////////////////////////////////////////////////
// Iterable kinds
/////////////////////////////////////////////////////////////////////
case reflect.Struct:
/*
The variables are structs like:
type T struct {
FirstName string
LastName string
}
Type = <pkg>.T, Kind = reflect.Struct
Iterate through the fields (FirstName, LastName), recurse into their values.
*/
// Types with an Equal() method, like time.Time, only if struct field
// is exported (CanInterface)
if eqFunc := a.MethodByName("Equal"); eqFunc.IsValid() && eqFunc.CanInterface() {
// Handle https://github.com/go-test/deep/issues/15:
// Don't call T.Equal if the method is from an embedded struct, like:
// type Foo struct { time.Time }
// First, we'll encounter Equal(Ttime, time.Time) but if we pass b
// as the 2nd arg we'll panic: "Call using pkg.Foo as type time.Time"
// As far as I can tell, there's no way to see that the method is from
// time.Time not Foo. So we check the type of the 1st (0) arg and skip
// unless it's b type. Later, we'll encounter the time.Time anonymous/
// embedded field and then we'll have Equal(time.Time, time.Time).
funcType := eqFunc.Type()
if funcType.NumIn() == 1 && funcType.In(0) == bType {
retVals := eqFunc.Call([]reflect.Value{b})
if !retVals[0].Bool() {
c.saveDiff(a, b)
}
return
}
}
for i := 0; i < a.NumField(); i++ {
if aType.Field(i).PkgPath != "" && !CompareUnexportedFields {
continue // skip unexported field, e.g. s in type T struct {s string}
}
if aType.Field(i).Tag.Get("deep") == "-" {
continue // field wants to be ignored
}
c.push(aType.Field(i).Name) // push field name to buff
// Get the Value for each field, e.g. FirstName has Type = string,
// Kind = reflect.String.
af := a.Field(i)
bf := b.Field(i)
// Recurse to compare the field values
c.equals(af, bf, level+1)
c.pop() // pop field name from buff
if len(c.diff) >= MaxDiff {
break
}
}
case reflect.Map:
/*
The variables are maps like:
map[string]int{
"foo": 1,
"bar": 2,
}
Type = map[string]int, Kind = reflect.Map
Or:
type T map[string]int{}
Type = <pkg>.T, Kind = reflect.Map
Iterate through the map keys (foo, bar), recurse into their values.
*/
if a.IsNil() || b.IsNil() {
if NilMapsAreEmpty {
if a.IsNil() && b.Len() != 0 {
c.saveDiff("<nil map>", b)
return
} else if a.Len() != 0 && b.IsNil() {
c.saveDiff(a, "<nil map>")
return
}
} else {
if a.IsNil() && !b.IsNil() {
c.saveDiff("<nil map>", b)
} else if !a.IsNil() && b.IsNil() {
c.saveDiff(a, "<nil map>")
}
}
return
}
if a.Pointer() == b.Pointer() {
return
}
for _, key := range a.MapKeys() {
c.push(fmt.Sprintf("map[%v]", key))
aVal := a.MapIndex(key)
bVal := b.MapIndex(key)
if bVal.IsValid() {
c.equals(aVal, bVal, level+1)
} else {
c.saveDiff(aVal, "<does not have key>")
}
c.pop()
if len(c.diff) >= MaxDiff {
return
}
}
for _, key := range b.MapKeys() {
if aVal := a.MapIndex(key); aVal.IsValid() {
continue
}
c.push(fmt.Sprintf("map[%v]", key))
c.saveDiff("<does not have key>", b.MapIndex(key))
c.pop()
if len(c.diff) >= MaxDiff {
return
}
}
case reflect.Array:
n := a.Len()
for i := 0; i < n; i++ {
c.push(fmt.Sprintf("array[%d]", i))
c.equals(a.Index(i), b.Index(i), level+1)
c.pop()
if len(c.diff) >= MaxDiff {
break
}
}
case reflect.Slice:
if NilSlicesAreEmpty {
if a.IsNil() && b.Len() != 0 {
c.saveDiff("<nil slice>", b)
return
} else if a.Len() != 0 && b.IsNil() {
c.saveDiff(a, "<nil slice>")
return
}
} else {
if a.IsNil() && !b.IsNil() {
c.saveDiff("<nil slice>", b)
return
} else if !a.IsNil() && b.IsNil() {
c.saveDiff(a, "<nil slice>")
return
}
}
aLen := a.Len()
bLen := b.Len()
if a.Pointer() == b.Pointer() && aLen == bLen {
return
}
n := aLen
if bLen > aLen {
n = bLen
}
for i := 0; i < n; i++ {
c.push(fmt.Sprintf("slice[%d]", i))
if i < aLen && i < bLen {
c.equals(a.Index(i), b.Index(i), level+1)
} else if i < aLen {
c.saveDiff(a.Index(i), "<no value>")
} else {
c.saveDiff("<no value>", b.Index(i))
}
c.pop()
if len(c.diff) >= MaxDiff {
break
}
}
/////////////////////////////////////////////////////////////////////
// Primitive kinds
/////////////////////////////////////////////////////////////////////
case reflect.Float32, reflect.Float64:
// Round floats to FloatPrecision decimal places to compare with
// user-defined precision. As is commonly know, floats have "imprecision"
// such that 0.1 becomes 0.100000001490116119384765625. This cannot
// be avoided; it can only be handled. Issue 30 suggested that floats
// be compared using an epsilon: equal = |a-b| < epsilon.
// In many cases the result is the same, but I think epsilon is a little
// less clear for users to reason about. See issue 30 for details.
aval := fmt.Sprintf(c.floatFormat, a.Float())
bval := fmt.Sprintf(c.floatFormat, b.Float())
if aval != bval {
c.saveDiff(a.Float(), b.Float())
}
case reflect.Bool:
if a.Bool() != b.Bool() {
c.saveDiff(a.Bool(), b.Bool())
}
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
if a.Int() != b.Int() {
c.saveDiff(a.Int(), b.Int())
}
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
if a.Uint() != b.Uint() {
c.saveDiff(a.Uint(), b.Uint())
}
case reflect.String:
if a.String() != b.String() {
c.saveDiff(a.String(), b.String())
}
default:
logError(ErrNotHandled)
}
}
func (c *cmp) push(name string) {
c.buff = append(c.buff, name)
}
func (c *cmp) pop() {
if len(c.buff) > 0 {
c.buff = c.buff[0 : len(c.buff)-1]
}
}
func (c *cmp) saveDiff(aval, bval interface{}) {
if len(c.buff) > 0 {
varName := strings.Join(c.buff, ".")
c.diff = append(c.diff, fmt.Sprintf("%s: %v != %v", varName, aval, bval))
} else {
c.diff = append(c.diff, fmt.Sprintf("%v != %v", aval, bval))
}
}
func logError(err error) {
if LogErrors {
log.Println(err)
}
}