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merge_test.go
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merge_test.go
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package jsonpatch
import (
"fmt"
"strings"
"testing"
)
func mergePatch(doc, patch string) string {
out, err := MergePatch([]byte(doc), []byte(patch))
if err != nil {
panic(err)
}
return string(out)
}
func TestMergePatchReplaceKey(t *testing.T) {
doc := `{ "title": "hello" }`
pat := `{ "title": "goodbye" }`
res := mergePatch(doc, pat)
if !compareJSON(pat, res) {
t.Fatalf("Key was not replaced")
}
}
func TestMergePatchIgnoresOtherValues(t *testing.T) {
doc := `{ "title": "hello", "age": 18 }`
pat := `{ "title": "goodbye" }`
res := mergePatch(doc, pat)
exp := `{ "title": "goodbye", "age": 18 }`
if !compareJSON(exp, res) {
t.Fatalf("Key was not replaced")
}
}
func TestMergePatchNilDoc(t *testing.T) {
doc := `{ "title": null }`
pat := `{ "title": {"foo": "bar"} }`
res := mergePatch(doc, pat)
exp := `{ "title": {"foo": "bar"} }`
if !compareJSON(exp, res) {
t.Fatalf("Key was not replaced")
}
}
func TestMergePatchRecursesIntoObjects(t *testing.T) {
doc := `{ "person": { "title": "hello", "age": 18 } }`
pat := `{ "person": { "title": "goodbye" } }`
res := mergePatch(doc, pat)
exp := `{ "person": { "title": "goodbye", "age": 18 } }`
if !compareJSON(exp, res) {
t.Fatalf("Key was not replaced")
}
}
type nonObjectCases struct {
doc, pat, res string
}
func TestMergePatchReplacesNonObjectsWholesale(t *testing.T) {
a1 := `[1]`
a2 := `[2]`
o1 := `{ "a": 1 }`
o2 := `{ "a": 2 }`
o3 := `{ "a": 1, "b": 1 }`
o4 := `{ "a": 2, "b": 1 }`
cases := []nonObjectCases{
{a1, a2, a2},
{o1, a2, a2},
{a1, o1, o1},
{o3, o2, o4},
}
for _, c := range cases {
act := mergePatch(c.doc, c.pat)
if !compareJSON(c.res, act) {
t.Errorf("whole object replacement failed")
}
}
}
func TestMergePatchReturnsErrorOnBadJSON(t *testing.T) {
_, err := MergePatch([]byte(`[[[[`), []byte(`1`))
if err == nil {
t.Errorf("Did not return an error for bad json: %s", err)
}
_, err = MergePatch([]byte(`1`), []byte(`[[[[`))
if err == nil {
t.Errorf("Did not return an error for bad json: %s", err)
}
}
func TestMergePatchReturnsEmptyArrayOnEmptyArray(t *testing.T) {
doc := `{ "array": ["one", "two"] }`
pat := `{ "array": [] }`
exp := `{ "array": [] }`
res, err := MergePatch([]byte(doc), []byte(pat))
if err != nil {
t.Errorf("Unexpected error: %s, %s", err, string(res))
}
if !compareJSON(exp, string(res)) {
t.Fatalf("Emtpy array did not return not return as empty array")
}
}
var rfcTests = []struct {
target string
patch string
expected string
}{
// test cases from https://tools.ietf.org/html/rfc7386#appendix-A
{target: `{"a":"b"}`, patch: `{"a":"c"}`, expected: `{"a":"c"}`},
{target: `{"a":"b"}`, patch: `{"b":"c"}`, expected: `{"a":"b","b":"c"}`},
{target: `{"a":"b"}`, patch: `{"a":null}`, expected: `{}`},
{target: `{"a":"b","b":"c"}`, patch: `{"a":null}`, expected: `{"b":"c"}`},
{target: `{"a":["b"]}`, patch: `{"a":"c"}`, expected: `{"a":"c"}`},
{target: `{"a":"c"}`, patch: `{"a":["b"]}`, expected: `{"a":["b"]}`},
{target: `{"a":{"b": "c"}}`, patch: `{"a": {"b": "d","c": null}}`, expected: `{"a":{"b":"d"}}`},
{target: `{"a":[{"b":"c"}]}`, patch: `{"a":[1]}`, expected: `{"a":[1]}`},
{target: `["a","b"]`, patch: `["c","d"]`, expected: `["c","d"]`},
{target: `{"a":"b"}`, patch: `["c"]`, expected: `["c"]`},
// {target: `{"a":"foo"}`, patch: `null`, expected: `null`},
// {target: `{"a":"foo"}`, patch: `"bar"`, expected: `"bar"`},
{target: `{"e":null}`, patch: `{"a":1}`, expected: `{"a":1,"e":null}`},
{target: `[1,2]`, patch: `{"a":"b","c":null}`, expected: `{"a":"b"}`},
{target: `{}`, patch: `{"a":{"bb":{"ccc":null}}}`, expected: `{"a":{"bb":{}}}`},
}
func TestMergePatchRFCCases(t *testing.T) {
for i, c := range rfcTests {
out := mergePatch(c.target, c.patch)
if !compareJSON(out, c.expected) {
t.Errorf("case[%d], patch '%s' did not apply properly to '%s'. expected:\n'%s'\ngot:\n'%s'", i, c.patch, c.target, c.expected, out)
}
}
}
var rfcFailTests = `
{"a":"foo"} | null
{"a":"foo"} | "bar"
`
func TestMergePatchFailRFCCases(t *testing.T) {
tests := strings.Split(rfcFailTests, "\n")
for _, c := range tests {
if strings.TrimSpace(c) == "" {
continue
}
parts := strings.SplitN(c, "|", 2)
doc := strings.TrimSpace(parts[0])
pat := strings.TrimSpace(parts[1])
out, err := MergePatch([]byte(doc), []byte(pat))
if err != errBadJSONPatch {
t.Errorf("error not returned properly: %s, %s", err, string(out))
}
}
}
func TestResembleJSONArray(t *testing.T) {
testCases := []struct {
input []byte
expected bool
}{
// Failure cases
{input: []byte(``), expected: false},
{input: []byte(`not an array`), expected: false},
{input: []byte(`{"foo": "bar"}`), expected: false},
{input: []byte(`{"fizz": ["buzz"]}`), expected: false},
{input: []byte(`[bad suffix`), expected: false},
{input: []byte(`bad prefix]`), expected: false},
{input: []byte(`][`), expected: false},
// Valid cases
{input: []byte(`[]`), expected: true},
{input: []byte(`["foo", "bar"]`), expected: true},
{input: []byte(`[["foo", "bar"]]`), expected: true},
{input: []byte(`[not valid syntax]`), expected: true},
// Valid cases with whitespace
{input: []byte(` []`), expected: true},
{input: []byte(`[] `), expected: true},
{input: []byte(` [] `), expected: true},
{input: []byte(` [ ] `), expected: true},
{input: []byte("\t[]"), expected: true},
{input: []byte("[]\n"), expected: true},
{input: []byte("\n\t\r[]"), expected: true},
}
for _, test := range testCases {
result := resemblesJSONArray(test.input)
if result != test.expected {
t.Errorf(
`expected "%t" but received "%t" for case: "%s"`,
test.expected,
result,
string(test.input),
)
}
}
}
func TestCreateMergePatchReplaceKey(t *testing.T) {
doc := `{ "title": "hello", "nested": {"one": 1, "two": 2} }`
pat := `{ "title": "goodbye", "nested": {"one": 2, "two": 2} }`
exp := `{ "title": "goodbye", "nested": {"one": 2} }`
res, err := CreateMergePatch([]byte(doc), []byte(pat))
if err != nil {
t.Errorf("Unexpected error: %s, %s", err, string(res))
}
if !compareJSON(exp, string(res)) {
t.Fatalf("Key was not replaced")
}
}
func TestCreateMergePatchGetArray(t *testing.T) {
doc := `{ "title": "hello", "array": ["one", "two"], "notmatch": [1, 2, 3] }`
pat := `{ "title": "hello", "array": ["one", "two", "three"], "notmatch": [1, 2, 3] }`
exp := `{ "array": ["one", "two", "three"] }`
res, err := CreateMergePatch([]byte(doc), []byte(pat))
if err != nil {
t.Errorf("Unexpected error: %s, %s", err, string(res))
}
if !compareJSON(exp, string(res)) {
t.Fatalf("Array was not added")
}
}
func TestCreateMergePatchGetObjArray(t *testing.T) {
doc := `{ "title": "hello", "array": [{"banana": true}, {"evil": false}], "notmatch": [{"one":1}, {"two":2}, {"three":3}] }`
pat := `{ "title": "hello", "array": [{"banana": false}, {"evil": true}], "notmatch": [{"one":1}, {"two":2}, {"three":3}] }`
exp := `{ "array": [{"banana": false}, {"evil": true}] }`
res, err := CreateMergePatch([]byte(doc), []byte(pat))
if err != nil {
t.Errorf("Unexpected error: %s, %s", err, string(res))
}
if !compareJSON(exp, string(res)) {
t.Fatalf("Object array was not added")
}
}
func TestCreateMergePatchDeleteKey(t *testing.T) {
doc := `{ "title": "hello", "nested": {"one": 1, "two": 2} }`
pat := `{ "title": "hello", "nested": {"one": 1} }`
exp := `{"nested":{"two":null}}`
res, err := CreateMergePatch([]byte(doc), []byte(pat))
if err != nil {
t.Errorf("Unexpected error: %s, %s", err, string(res))
}
// We cannot use "compareJSON", since Equals does not report a difference if the value is null
if exp != string(res) {
t.Fatalf("Key was not removed")
}
}
func TestCreateMergePatchEmptyArray(t *testing.T) {
doc := `{ "array": null }`
pat := `{ "array": [] }`
exp := `{"array":[]}`
res, err := CreateMergePatch([]byte(doc), []byte(pat))
if err != nil {
t.Errorf("Unexpected error: %s, %s", err, string(res))
}
// We cannot use "compareJSON", since Equals does not report a difference if the value is null
if exp != string(res) {
t.Fatalf("Key was not removed")
}
}
func TestCreateMergePatchNil(t *testing.T) {
doc := `{ "title": "hello", "nested": {"one": 1, "two": [{"one":null}, {"two":null}, {"three":null}]} }`
pat := doc
exp := `{}`
res, err := CreateMergePatch([]byte(doc), []byte(pat))
if err != nil {
t.Errorf("Unexpected error: %s, %s", err, string(res))
}
if !compareJSON(exp, string(res)) {
t.Fatalf("Object array was not added")
}
}
func TestCreateMergePatchObjArray(t *testing.T) {
doc := `{ "array": [ {"a": {"b": 2}}, {"a": {"b": 3}} ]}`
exp := `{}`
res, err := CreateMergePatch([]byte(doc), []byte(doc))
if err != nil {
t.Errorf("Unexpected error: %s, %s", err, string(res))
}
// We cannot use "compareJSON", since Equals does not report a difference if the value is null
if exp != string(res) {
t.Fatalf("Array was not empty, was " + string(res))
}
}
func TestCreateMergePatchSameOuterArray(t *testing.T) {
doc := `[{"foo": "bar"}]`
pat := doc
exp := `[{}]`
res, err := CreateMergePatch([]byte(doc), []byte(pat))
if err != nil {
t.Errorf("Unexpected error: %s, %s", err, string(res))
}
if !compareJSON(exp, string(res)) {
t.Fatalf("Outer array was not unmodified")
}
}
func TestCreateMergePatchModifiedOuterArray(t *testing.T) {
doc := `[{"name": "John"}, {"name": "Will"}]`
pat := `[{"name": "Jane"}, {"name": "Will"}]`
exp := `[{"name": "Jane"}, {}]`
res, err := CreateMergePatch([]byte(doc), []byte(pat))
if err != nil {
t.Errorf("Unexpected error: %s, %s", err, string(res))
}
if !compareJSON(exp, string(res)) {
t.Fatalf("Expected %s but received %s", exp, res)
}
}
func TestCreateMergePatchMismatchedOuterArray(t *testing.T) {
doc := `[{"name": "John"}, {"name": "Will"}]`
pat := `[{"name": "Jane"}]`
_, err := CreateMergePatch([]byte(doc), []byte(pat))
if err == nil {
t.Errorf("Expected error due to array length differences but received none")
}
}
func TestCreateMergePatchMismatchedOuterTypes(t *testing.T) {
doc := `[{"name": "John"}]`
pat := `{"name": "Jane"}`
_, err := CreateMergePatch([]byte(doc), []byte(pat))
if err == nil {
t.Errorf("Expected error due to mismatched types but received none")
}
}
func TestCreateMergePatchNoDifferences(t *testing.T) {
doc := `{ "title": "hello", "nested": {"one": 1, "two": 2} }`
pat := doc
exp := `{}`
res, err := CreateMergePatch([]byte(doc), []byte(pat))
if err != nil {
t.Errorf("Unexpected error: %s, %s", err, string(res))
}
if !compareJSON(exp, string(res)) {
t.Fatalf("Key was not replaced")
}
}
func TestCreateMergePatchComplexMatch(t *testing.T) {
doc := `{"hello": "world","t": true ,"f": false, "n": null,"i": 123,"pi": 3.1416,"a": [1, 2, 3, 4], "nested": {"hello": "world","t": true ,"f": false, "n": null,"i": 123,"pi": 3.1416,"a": [1, 2, 3, 4]} }`
empty := `{}`
res, err := CreateMergePatch([]byte(doc), []byte(doc))
if err != nil {
t.Errorf("Unexpected error: %s, %s", err, string(res))
}
// We cannot use "compareJSON", since Equals does not report a difference if the value is null
if empty != string(res) {
t.Fatalf("Did not get empty result, was:%s", string(res))
}
}
func TestCreateMergePatchComplexAddAll(t *testing.T) {
doc := `{"hello": "world","t": true ,"f": false, "n": null,"i": 123,"pi": 3.1416,"a": [1, 2, 3, 4], "nested": {"hello": "world","t": true ,"f": false, "n": null,"i": 123,"pi": 3.1416,"a": [1, 2, 3, 4]} }`
empty := `{}`
res, err := CreateMergePatch([]byte(empty), []byte(doc))
if err != nil {
t.Errorf("Unexpected error: %s, %s", err, string(res))
}
if !compareJSON(doc, string(res)) {
t.Fatalf("Did not get everything as, it was:\n%s", string(res))
}
}
// createNestedMap created a series of nested map objects such that the number of
// objects is roughly 2^n (precisely, 2^(n+1)-1).
func createNestedMap(m map[string]interface{}, depth int, objectCount *int) {
if depth == 0 {
return
}
for i := 0; i< 2;i++ {
nested := map[string]interface{}{}
*objectCount += 1
createNestedMap(nested, depth-1, objectCount)
m[fmt.Sprintf("key-%v", i)] = nested
}
}
func benchmarkMatchesValueWithDeeplyNestedFields(depth int, b *testing.B) {
a := map[string]interface{}{}
objCount := 1
createNestedMap(a, depth, &objCount)
b.ResetTimer()
b.Run(fmt.Sprintf("objectCount=%v", objCount), func(b *testing.B) {
for i := 0; i < b.N; i++ {
if !matchesValue(a, a) {
b.Errorf("Should be equal")
}
}
})
}
func BenchmarkMatchesValue1(b *testing.B) { benchmarkMatchesValueWithDeeplyNestedFields(1, b) }
func BenchmarkMatchesValue2(b *testing.B) { benchmarkMatchesValueWithDeeplyNestedFields(2, b) }
func BenchmarkMatchesValue3(b *testing.B) { benchmarkMatchesValueWithDeeplyNestedFields(3, b) }
func BenchmarkMatchesValue4(b *testing.B) { benchmarkMatchesValueWithDeeplyNestedFields(4, b) }
func BenchmarkMatchesValue5(b *testing.B) { benchmarkMatchesValueWithDeeplyNestedFields(5, b) }
func BenchmarkMatchesValue6(b *testing.B) { benchmarkMatchesValueWithDeeplyNestedFields(6, b) }
func BenchmarkMatchesValue7(b *testing.B) { benchmarkMatchesValueWithDeeplyNestedFields(7, b) }
func BenchmarkMatchesValue8(b *testing.B) { benchmarkMatchesValueWithDeeplyNestedFields(8, b) }
func BenchmarkMatchesValue9(b *testing.B) { benchmarkMatchesValueWithDeeplyNestedFields(9, b) }
func BenchmarkMatchesValue10(b *testing.B) { benchmarkMatchesValueWithDeeplyNestedFields(10, b) }
func TestCreateMergePatchComplexRemoveAll(t *testing.T) {
doc := `{"hello": "world","t": true ,"f": false, "n": null,"i": 123,"pi": 3.1416,"a": [1, 2, 3, 4], "nested": {"hello": "world","t": true ,"f": false, "n": null,"i": 123,"pi": 3.1416,"a": [1, 2, 3, 4]} }`
exp := `{"a":null,"f":null,"hello":null,"i":null,"n":null,"nested":null,"pi":null,"t":null}`
empty := `{}`
res, err := CreateMergePatch([]byte(doc), []byte(empty))
if err != nil {
t.Errorf("Unexpected error: %s, %s", err, string(res))
}
if exp != string(res) {
t.Fatalf("Did not get result, was:%s", string(res))
}
// FIXME: Crashes if using compareJSON like this:
/*
if !compareJSON(doc, string(res)) {
t.Fatalf("Did not get everything as, it was:\n%s", string(res))
}
*/
}
func TestCreateMergePatchObjectWithInnerArray(t *testing.T) {
stateString := `{
"OuterArray": [
{
"InnerArray": [
{
"StringAttr": "abc123"
}
],
"StringAttr": "def456"
}
]
}`
patch, err := CreateMergePatch([]byte(stateString), []byte(stateString))
if err != nil {
t.Fatal(err)
}
if string(patch) != "{}" {
t.Fatalf("Patch should have been {} but was: %v", string(patch))
}
}
func TestCreateMergePatchReplaceKeyNotEscape(t *testing.T) {
doc := `{ "title": "hello", "nested": {"title/escaped": 1, "two": 2} }`
pat := `{ "title": "goodbye", "nested": {"title/escaped": 2, "two": 2} }`
exp := `{ "title": "goodbye", "nested": {"title/escaped": 2} }`
res, err := CreateMergePatch([]byte(doc), []byte(pat))
if err != nil {
t.Errorf("Unexpected error: %s, %s", err, string(res))
}
if !compareJSON(exp, string(res)) {
t.Log(string(res))
t.Fatalf("Key was not replaced")
}
}
func TestMergePatchReplaceKeyNotEscaping(t *testing.T) {
doc := `{ "obj": { "title/escaped": "hello" } }`
pat := `{ "obj": { "title/escaped": "goodbye" } }`
exp := `{ "obj": { "title/escaped": "goodbye" } }`
res := mergePatch(doc, pat)
if !compareJSON(exp, res) {
t.Fatalf("Key was not replaced")
}
}
func TestMergeMergePatches(t *testing.T) {
cases := []struct {
demonstrates string
p1 string
p2 string
exp string
}{
{
demonstrates: "simple patches are merged normally",
p1: `{"add1": 1}`,
p2: `{"add2": 2}`,
exp: `{"add1": 1, "add2": 2}`,
},
{
demonstrates: "nulls are kept",
p1: `{"del1": null}`,
p2: `{"del2": null}`,
exp: `{"del1": null, "del2": null}`,
},
{
demonstrates: "a key added then deleted is kept deleted",
p1: `{"add_then_delete": "atd"}`,
p2: `{"add_then_delete": null}`,
exp: `{"add_then_delete": null}`,
},
{
demonstrates: "a key deleted then added is kept added",
p1: `{"delete_then_add": null}`,
p2: `{"delete_then_add": "dta"}`,
exp: `{"delete_then_add": "dta"}`,
},
{
demonstrates: "object overrides array",
p1: `[]`,
p2: `{"del": null, "add": "a"}`,
exp: `{"del": null, "add": "a"}`,
},
{
demonstrates: "array overrides object",
p1: `{"del": null, "add": "a"}`,
p2: `[]`,
exp: `[]`,
},
}
for _, c := range cases {
out, err := MergeMergePatches([]byte(c.p1), []byte(c.p2))
if err != nil {
panic(err)
}
if !compareJSON(c.exp, string(out)) {
t.Logf("Error while trying to demonstrate: %v", c.demonstrates)
t.Logf("Got %v", string(out))
t.Logf("Expected %v", c.exp)
t.Fatalf("Merged merge patch is incorrect")
}
}
}