Add new tests to presubmit, fix errors

go/gitinfo/gitinfo_test.go

Index: go/gitinfo/gitinfo_test.go
diff --git a/go/gitinfo/gitinfo_test.go b/go/gitinfo/gitinfo_test.go
index 4a45b597ac7159d3eb923519e900a1f01b270570..2cf8d1a01c7b6063ee746e4a5c9b1802c7dc1bf4 100644
--- a/go/gitinfo/gitinfo_test.go
+++ b/go/gitinfo/gitinfo_test.go
@@ -81,7 +81,7 @@ func TestFrom(t *testing.T) {
 	for _, tc := range testCases {
 		hashes := r.From(time.Unix(tc.ts, 0))
 		if got, want := len(hashes), tc.length; got != want {
-			t.Errorf("For ts: %d Length returned is wrong: Got %s Want %d", tc.ts, got, want)
+			t.Errorf("For ts: %d Length returned is wrong: Got %d Want %d", tc.ts, got, want)
 		}
 	}
 }