diff --git a/go.mod b/go.mod
index fdac399..694ab5d 100644
--- a/go.mod
+++ b/go.mod
@@ -2,9 +2,13 @@ module scm.yoorie.de/go-lib/util
 
 go 1.18
 
-require gotest.tools v2.2.0+incompatible
+require (
+	github.com/stretchr/testify v1.7.1
+	golang.org/x/sys v0.0.0-20220405052023-b1e9470b6e64
+)
 
 require (
-	github.com/google/go-cmp v0.5.7 // indirect
-	github.com/pkg/errors v0.9.1 // indirect
+	github.com/davecgh/go-spew v1.1.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
 )
diff --git a/go.sum b/go.sum
index bf21e2d..eab2ab1 100644
--- a/go.sum
+++ b/go.sum
@@ -1,8 +1,13 @@
-github.com/google/go-cmp v0.5.7 h1:81/ik6ipDQS2aGcBfIN5dHDB36BwrStyeAQquSYCV4o=
-github.com/google/go-cmp v0.5.7/go.mod h1:n+brtR0CgQNWTVd5ZUFpTBC8YFBDLK/h/bpaJ8/DtOE=
-github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
-github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-gotest.tools v2.2.0+incompatible h1:VsBPFP1AI068pPrMxtb/S8Zkgf9xEmTLJjfM+P5UIEo=
-gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.7.1 h1:5TQK59W5E3v0r2duFAb7P95B6hEeOyEnHRa8MjYSMTY=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+golang.org/x/sys v0.0.0-20220405052023-b1e9470b6e64 h1:D1v9ucDTYBtbz5vNuBbAhIMAGhQhJ6Ym5ah3maMVNX4=
+golang.org/x/sys v0.0.0-20220405052023-b1e9470b6e64/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/os_windows.go b/os_windows.go
index 102eee1..ea7e3ce 100644
--- a/os_windows.go
+++ b/os_windows.go
@@ -4,18 +4,47 @@
 package util
 
 import (
+	"log"
 	"os"
 	"path/filepath"
+
+	"golang.org/x/sys/windows"
 )
 
 // IsSuperUser returns true, if the current user is a super user
 // A.K.A root, Administrator etc
 func IsSuperUser() bool {
-	_, err := os.Open("\\\\.\\PHYSICALDRIVE0")
+	var sid *windows.SID
+
+	// Although this looks scary, it is directly copied from the
+	// official windows documentation. The Go API for this is a
+	// direct wrap around the official C++ API.
+	// See https://docs.microsoft.com/en-us/windows/desktop/api/securitybaseapi/nf-securitybaseapi-checktokenmembership
+	err := windows.AllocateAndInitializeSid(
+		&windows.SECURITY_NT_AUTHORITY,
+		2,
+		windows.SECURITY_BUILTIN_DOMAIN_RID,
+		windows.DOMAIN_ALIAS_RID_ADMINS,
+		0, 0, 0, 0, 0, 0,
+		&sid)
 	if err != nil {
+		log.Fatalf("SID Error: %s", err)
 		return false
 	}
-	return true
+	defer windows.FreeSid(sid)
+
+	// This appears to cast a null pointer so I'm not sure why this
+	// works, but this guy says it does and it Works for Me™:
+	// https://github.com/golang/go/issues/28804#issuecomment-438838144
+	token := windows.Token(0)
+
+	member, err := token.IsMember(sid)
+	if err != nil {
+		log.Fatalf("Token Membership Error: %s", err)
+		return false
+	}
+
+	return member
 }
 
 // GetGlobalConfigurationDirectory returns OS specific location for putting
diff --git a/utils_test.go b/utils_test.go
index 04b8308..53de342 100644
--- a/utils_test.go
+++ b/utils_test.go
@@ -3,12 +3,12 @@ package util
 import (
 	"testing"
 
-	"gotest.tools/assert"
+	"github.com/stretchr/testify/assert"
 )
 
 func TestFileExist(t *testing.T) {
-	assert.Assert(t, FileExists("utils.go"))
-	assert.Assert(t, !FileExists("Utils2.go"))
+	assert.True(t, FileExists("utils.go"))
+	assert.True(t, !FileExists("Utils2.go"))
 }
 
 func TestJoiningSlash(t *testing.T) {
@@ -18,3 +18,12 @@ func TestJoiningSlash(t *testing.T) {
 	assert.Equal(t, "http://my.tld/docs/bla/blub", JoiningSlash("http://my.tld/docs", "bla/", "blub"))
 	assert.Equal(t, "http://my.tld/docs/bla/blub", JoiningSlash("http://my.tld/docs/", "bla/", "blub"))
 }
+
+/* Can run only as admin within windows or linux
+func TestIsSuperUser(t *testing.T) {
+	cuser, err := user.Current()
+	assert.Nil(t, err)
+	assert.NotNil(t, cuser)
+	assert.True(t, IsSuperUser())
+}
+*/