opt.Optional[bool|string].MarshalJSON()

master
Charles Iliya Krempeaux 2023-09-23 09:29:41 +09:00
parent a33304548a
commit 58bf264aa9
4 changed files with 170 additions and 10 deletions

View File

@ -2,7 +2,6 @@ package opt
import ( import (
"fmt" "fmt"
"encoding/json"
) )
// Optional represents an optional value. // Optional represents an optional value.
@ -170,15 +169,6 @@ func (receiver Optional[T]) GoString() string {
return fmt.Sprintf("opt.Something[%T](%#v)", receiver.value, receiver.value) return fmt.Sprintf("opt.Something[%T](%#v)", receiver.value, receiver.value)
} }
// MarshalJSON makes it so json.Marshaler is implemented.
func (receiver Optional[string]) MarshalJSON() ([]byte, error) {
if !receiver.something {
return nil, fmt.Errorf("cannot marshal opt.Nothing[%T]()", receiver.value)
}
return json.Marshal(receiver.value)
}
// WhenNothing will call fn when receiver is holding nothing. // WhenNothing will call fn when receiver is holding nothing.
// //
// It will not call fn when receier is hold something. // It will not call fn when receier is hold something.

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@ -0,0 +1,19 @@
package opt
import (
"fmt"
"encoding/json"
)
type jsonMarshaler interface {
bool | string
}
// MarshalJSON makes it so json.Marshaler is implemented.
func (receiver Optional[jsonMarshal]) MarshalJSON() ([]byte, error) {
if !receiver.something {
return nil, fmt.Errorf("cannot marshal opt.Nothing[%T]()", receiver.value)
}
return json.Marshal(receiver.value)
}

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@ -0,0 +1,46 @@
package opt_test
import (
"testing"
"sourcecode.social/reiver/go-opt"
)
func TestOptional_MarshalJSON_bool(t *testing.T) {
tests := []struct{
Value opt.Optional[bool]
Expected string
}{
{
Value: opt.Something(false),
Expected: "false",
},
{
Value: opt.Something(true),
Expected: "true",
},
}
for testNumber, test := range tests {
actualBytes, err := test.Value.MarshalJSON()
if nil != err {
t.Errorf("For test #%d, did not expect an error but actually got one." , testNumber)
t.Logf("ERROR: (%T) %s", err, err)
t.Logf("VALUE: %#v", test.Value)
continue
}
actual := string(actualBytes)
expected := test.Expected
if expected != actual {
t.Errorf("For test #%d, the actual value for the JSON marshaling is not what was expected.", testNumber)
t.Logf("EXPECTED: %q", expected)
t.Logf("ACTUAL: %q", actual)
t.Logf("VALUE: %#v", test.Value)
continue
}
}
}

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@ -0,0 +1,105 @@
package opt_test
import (
"testing"
"sourcecode.social/reiver/go-opt"
)
func TestOptional_MarshalJSON_string(t *testing.T) {
tests := []struct{
Value opt.Optional[string]
Expected string
}{
{
Value: opt.Something(""),
Expected: `""`,
},
{
Value: opt.Something("apple"),
Expected: `"apple"`,
},
{
Value: opt.Something("banana"),
Expected: `"banana"`,
},
{
Value: opt.Something("cherry"),
Expected: `"cherry"`,
},
{
Value: opt.Something("ONCE"),
Expected: `"ONCE"`,
},
{
Value: opt.Something("TWICE"),
Expected: `"TWICE"`,
},
{
Value: opt.Something("THRICE"),
Expected: `"THRICE"`,
},
{
Value: opt.Something("FOURCE"),
Expected: `"FOURCE"`,
},
{
Value: opt.Something("🙂"),
Expected: `"🙂"`,
},
{
Value: opt.Something("😈"),
Expected: `"😈"`,
},
{
Value: opt.Something("❤️"),
Expected: `"❤️"`,
},
{
Value: opt.Something("٠١٢٣۴۵۶٧٨٩"),
Expected: `"٠١٢٣۴۵۶٧٨٩"`,
},
{
Value: opt.Something("𐏑𐏓𐏕"),
Expected: `"𐏑𐏓𐏕"`,
},
}
for testNumber, test := range tests {
actualBytes, err := test.Value.MarshalJSON()
if nil != err {
t.Errorf("For test #%d, did not expect an error but actually got one." , testNumber)
t.Logf("ERROR: (%T) %s", err, err)
t.Logf("VALUE: %#v", test.Value)
continue
}
actual := string(actualBytes)
expected := test.Expected
if expected != actual {
t.Errorf("For test #%d, the actual value for the JSON marshaling is not what was expected.", testNumber)
t.Logf("EXPECTED: %q", expected)
t.Logf("ACTUAL: %q", actual)
t.Logf("VALUE: %#v", test.Value)
continue
}
}
}