1 files changed, 30 insertions, 1 deletions
diff --git a/src/pkg/big/int_test.go b/src/pkg/big/int_test.go
index 58a55030d..7f33c9522 100755
--- a/src/pkg/big/int_test.go
+++ b/src/pkg/big/int_test.go
@@ -376,6 +376,35 @@ var formatTests = []struct {
 	{"-10", "%#X", "-0XA"},
 	{"10", "%#y", "%!y(big.Int=10)"},
 	{"-10", "%#y", "%!y(big.Int=-10)"},
+
+	{"1234", "%d", "1234"},
+	{"1234", "%3d", "1234"},
+	{"1234", "%4d", "1234"},
+	{"-1234", "%d", "-1234"},
+	{"1234", "% 5d", " 1234"},
+	{"1234", "%+5d", "+1234"},
+	{"1234", "%-5d", "1234 "},
+	{"1234", "%x", "4d2"},
+	{"1234", "%X", "4D2"},
+	{"1234", "% x", "4 d2"},
+	{"-1234", "%3x", "-4d2"},
+	{"-1234", "%4x", "-4d2"},
+	{"-1234", "%5x", " -4d2"},
+	{"-1234", "%-5x", "-4d2 "},
+	{"-1234", "% x", "-4 d2"},
+	{"1234", "%03d", "1234"},
+	{"1234", "%04d", "1234"},
+	{"1234", "%05d", "01234"},
+	{"1234", "%06d", "001234"},
+	{"-1234", "%06d", "-01234"},
+	{"1234", "%+06d", "+01234"},
+	{"1234", "% 06d", " 01234"},
+	{"1234", "%-6d", "1234  "},
+	{"1234", "%-06d", "001234"},
+	{"-1234", "%-06d", "-01234"},
+	{"10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000", // 10**100
+		"% x",
+		"12 49 ad 25 94 c3 7c eb 0b 27 84 c4 ce 0b f3 8a ce 40 8e 21 1a 7c aa b2 43 08 a8 2e 8f 10 00 00 00 00 00 00 00 00 00 00 00 00"},
 }
 
 
@@ -391,7 +420,7 @@ func TestFormat(t *testing.T) {
 		}
 		output := fmt.Sprintf(test.format, x)
 		if output != test.output {
-			t.Errorf("#%d got %s; want %s", i, output, test.output)
+			t.Errorf("#%d got %q; want %q", i, output, test.output)
 		}
 	}
 }