Rework the tests to make a bit more sense

Author: Jacalz

src/mime/testdata/test.types.globs2

@@ -4,5 +4,5 @@
 
 
 # mime package test for globs2
-50:application/test:*.t1
-50:text/test:*.t2
+50:document/test:*.t3
+50:example/test:*.t4

src/mime/type_unix.go

@@ -97,7 +97,7 @@ func initMimeUnix() {
 }
 
 func initMimeForTests() map[string]string {
-	mimeGlobs = []string{"testdata/test.types.globs2"}
+	mimeGlobs = []string{""}
 	typeFiles = []string{"testdata/test.types"}
 	return map[string]string{
 		".T1":  "application/test",

src/mime/type_unix_test.go

@@ -8,20 +8,22 @@ import (
 	"testing"
 )
 
-func initMimeUnixTest() {
+func initMimeUnixTest(t *testing.T) {
 	err := loadMimeGlobsFile("testdata/test.types.globs2")
 	if err != nil {
-		panic(err)
+		t.Fatal(err)
 	}
 
 	loadMimeFile("testdata/test.types")
 }
 
 func TestTypeByExtensionUNIX(t *testing.T) {
-	initMimeUnixTest()
+	initMimeUnixTest(t)
 	typeTests := map[string]string{
 		".T1":  "application/test",
 		".t2":  "text/test; charset=utf-8",
+		".t3":  "document/test",
+		".t4":  "example/test",
 		".png": "image/png",
 	}