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// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package json
import (
"archive/tar"
"bytes"
"errors"
"fmt"
"io"
"reflect"
"strconv"
"strings"
"testing"
)
func TestSemanticError(t *testing.T) {
tests := []struct {
err error
want string
}{{
err: &SemanticError{},
want: "json: cannot handle",
}, {
err: &SemanticError{JSONKind: 'n'},
want: "json: cannot handle JSON null",
}, {
err: &SemanticError{action: "unmarshal", JSONKind: 't'},
want: "json: cannot unmarshal JSON boolean",
}, {
err: &SemanticError{action: "unmarshal", JSONKind: 'x'},
want: "json: cannot unmarshal", // invalid token kinds are ignored
}, {
err: &SemanticError{action: "marshal", JSONKind: '"'},
want: "json: cannot marshal JSON string",
}, {
err: &SemanticError{GoType: reflect.TypeOf(bool(false))},
want: "json: cannot handle Go value of type bool",
}, {
err: &SemanticError{action: "marshal", GoType: reflect.TypeOf(int(0))},
want: "json: cannot marshal Go value of type int",
}, {
err: &SemanticError{action: "unmarshal", GoType: reflect.TypeOf(uint(0))},
want: "json: cannot unmarshal Go value of type uint",
}, {
err: &SemanticError{JSONKind: '0', GoType: reflect.TypeOf(tar.Header{})},
want: "json: cannot handle JSON number with Go value of type tar.Header",
}, {
err: &SemanticError{action: "marshal", JSONKind: '{', GoType: reflect.TypeOf(bytes.Buffer{})},
want: "json: cannot marshal JSON object from Go value of type bytes.Buffer",
}, {
err: &SemanticError{action: "unmarshal", JSONKind: ']', GoType: reflect.TypeOf(strings.Reader{})},
want: "json: cannot unmarshal JSON array into Go value of type strings.Reader",
}, {
err: &SemanticError{action: "unmarshal", JSONKind: '{', GoType: reflect.TypeOf(float64(0)), ByteOffset: 123},
want: "json: cannot unmarshal JSON object into Go value of type float64 after byte offset 123",
}, {
err: &SemanticError{action: "marshal", JSONKind: 'f', GoType: reflect.TypeOf(complex128(0)), ByteOffset: 123, JSONPointer: "/foo/2/bar/3"},
want: "json: cannot marshal JSON boolean from Go value of type complex128 within JSON value at \"/foo/2/bar/3\"",
}, {
err: &SemanticError{action: "unmarshal", JSONKind: '}', GoType: reflect.TypeOf((*io.Reader)(nil)).Elem(), ByteOffset: 123, JSONPointer: "/foo/2/bar/3", Err: errors.New("some underlying error")},
want: "json: cannot unmarshal JSON object into Go value of type io.Reader within JSON value at \"/foo/2/bar/3\": some underlying error",
}, {
err: &SemanticError{Err: errors.New("some underlying error")},
want: "json: cannot handle: some underlying error",
}, {
err: &SemanticError{ByteOffset: 123},
want: "json: cannot handle after byte offset 123",
}, {
err: &SemanticError{JSONPointer: "/foo/2/bar/3"},
want: "json: cannot handle within JSON value at \"/foo/2/bar/3\"",
}}
for _, tt := range tests {
got := tt.err.Error()
// Cleanup the error of non-deterministic rendering effects.
if strings.HasPrefix(got, errorPrefix+"unable to ") {
got = errorPrefix + "cannot " + strings.TrimPrefix(got, errorPrefix+"unable to ")
}
if got != tt.want {
t.Errorf("%#v.Error mismatch:\ngot %v\nwant %v", tt.err, got, tt.want)
}
}
}
func TestErrorsIs(t *testing.T) {
const (
someGlobalError = jsonError("some global error")
otherGlobalError = jsonError("other global error")
)
var (
someIOError = &ioError{action: "write", err: io.ErrShortWrite}
otherIOError = &ioError{action: "read", err: io.ErrUnexpectedEOF}
someSyntacticError = &SyntacticError{str: "some syntactic error"}
otherSyntacticError = &SyntacticError{str: "other syntactic error"}
someSemanticError = &SemanticError{action: "unmarshal", JSONKind: '0', GoType: reflect.TypeOf(int(0)), Err: strconv.ErrRange}
otherSemanticError = &SemanticError{action: "marshal", GoType: reflect.TypeOf(complex128(0))}
)
tests := []struct {
err error
target error
want bool
}{
// Top-level Error should match itself (identity).
{Error, Error, true},
// All sub-error values should match the top-level Error value.
{someGlobalError, Error, true},
{someIOError, Error, true},
{someSyntacticError, Error, true},
{someSemanticError, Error, true},
// Top-level Error should not match any other sub-error value.
{Error, someGlobalError, false},
{Error, someIOError, false},
{Error, someSyntacticError, false},
{Error, someSemanticError, false},
// Sub-error values should match itself (identity).
{someGlobalError, someGlobalError, true},
{someIOError, someIOError, true},
{someSyntacticError, someSyntacticError, true},
{someSemanticError, someSemanticError, true},
// Sub-error values should not match each other.
{someGlobalError, someIOError, false},
{someIOError, someSyntacticError, false},
{someSyntacticError, someSemanticError, false},
{someSemanticError, someGlobalError, false},
// Sub-error values should not match other error values of same type.
{someGlobalError, otherGlobalError, false},
{someIOError, otherIOError, false},
{someSyntacticError, otherSyntacticError, false},
{someSemanticError, otherSemanticError, false},
// Error should not match any other random error.
{Error, nil, false},
{nil, Error, false},
{io.ErrShortWrite, Error, false},
{Error, io.ErrShortWrite, false},
// Wrapped errors should be matched.
{&ioError{err: fmt.Errorf("%w", io.ErrShortWrite)}, io.ErrShortWrite, true}, // doubly wrapped
{&ioError{err: io.ErrShortWrite}, io.ErrShortWrite, true}, // singly wrapped
{&ioError{err: io.ErrShortWrite}, io.EOF, false},
{&SemanticError{Err: fmt.Errorf("%w", strconv.ErrRange)}, strconv.ErrRange, true}, // doubly wrapped
{&SemanticError{Err: strconv.ErrRange}, strconv.ErrRange, true}, // singly wrapped
{&SemanticError{Err: strconv.ErrRange}, io.EOF, false},
}
for _, tt := range tests {
got := errors.Is(tt.err, tt.target)
if got != tt.want {
t.Errorf("errors.Is(%#v, %#v) = %v, want %v", tt.err, tt.target, got, tt.want)
}
// If the type supports the Is method,
// it should behave the same way if called directly.
if iserr, ok := tt.err.(interface{ Is(error) bool }); ok {
got := iserr.Is(tt.target)
if got != tt.want {
t.Errorf("%#v.Is(%#v) = %v, want %v", tt.err, tt.target, got, tt.want)
}
}
}
}
func TestQuoteRune(t *testing.T) {
tests := []struct{ in, want string }{
{"x", `'x'`},
{"\n", `'\n'`},
{"'", `'\''`},
{"\xff", `'\xff'`},
{"💩", `'💩'`},
{"💩"[:1], `'\xf0'`},
{"\uffff", `'\uffff'`},
{"\U00101234", `'\U00101234'`},
}
for _, tt := range tests {
got := quoteRune([]byte(tt.in))
if got != tt.want {
t.Errorf("quoteRune(%q) = %s, want %s", tt.in, got, tt.want)
}
}
}
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