add comments for Format

shogo82148 · Oct 15, 2023 · 8526be2 · 8526be2
1 parent 25eef92
commit 8526be2
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Showing 2 changed files with 3 additions and 0 deletions.
diff --git a/format.go b/format.go
@@ -7,6 +7,7 @@ import (
 
 var _ fmt.Formatter = Int128{}
 
+// Format implements [fmt.Formatter].
 func (a Int128) Format(s fmt.State, ch rune) {
 	var out []byte
 	var prefix []byte
@@ -112,6 +113,7 @@ func (a Int128) Format(s fmt.State, ch rune) {
 
 var _ fmt.Formatter = Uint128{}
 
+// Format implements [fmt.Formatter].
 func (a Uint128) Format(s fmt.State, ch rune) {
 	var out []byte
 	var prefix []byte

diff --git a/format_test.go b/format_test.go
@@ -20,6 +20,7 @@ func TestInt128Format(t *testing.T) {
 		{"%8d", Int128{0, 0}, "       0"},
 		{"%08d", Int128{0, 0}, "00000000"},
 		{"%-8d", Int128{0, 0}, "0       "},
+		{"%-8d", Int128{0, 1}.Neg(), "-1      "},
 		{"%+08d", Int128{0, 0}, "+0000000"},
 		{"%+8d", Int128{0, 0}, "      +0"},
 		{"% 08d", Int128{0, 0}, " 0000000"},