internal: remove problematic test case

A test case for AbsRelPath does not work on all platforms and does not
bring much value. We delete it then.

Fixes golang/go#56838

Change-Id: Ia8b24e36e909d2bd3f601e9cd5ec3aa0ffe51eb1
Reviewed-on: https://go-review.googlesource.com/c/vuln/+/452655
Run-TryBot: Zvonimir Pavlinovic <zpavlinovic@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
diff --git a/internal/filepath_test.go b/internal/filepath_test.go
index 1f64d77..eac0ef1 100644
--- a/internal/filepath_test.go
+++ b/internal/filepath_test.go
@@ -5,32 +5,19 @@
 package internal
 
 import (
-	"os"
 	"path/filepath"
 	"testing"
 )
 
 func TestAbsRelShorter(t *testing.T) {
-	thisFile := "filepath_test.go"
-	thisFileAbs, _ := filepath.Abs(thisFile)
-
-	tf, err := os.CreateTemp("", "filepath_test.gp")
-	if err != nil {
-		t.Errorf("could not create temporary filepath_test.go file: %v", err)
-	}
-	tempFile := tf.Name()
-	tempFileAbs, _ := filepath.Abs(tempFile)
+	thisFileAbs, _ := filepath.Abs("filepath_test.go")
 
 	for _, test := range []struct {
 		l    string
 		want string
 	}{
-		{thisFile, "filepath_test.go"},
+		{"filepath_test.go", "filepath_test.go"},
 		{thisFileAbs, "filepath_test.go"},
-		// Relative path to temp file from "." is longer as
-		// it needs to go back the length of the absolute
-		// path and then in addition go to os.TempDir.
-		{tempFile, tempFileAbs},
 	} {
 		if got := AbsRelShorter(test.l); got != test.want {
 			t.Errorf("want %s; got %s", test.want, got)