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parser_test.go
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parser_test.go
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package libhosty
import (
"strings"
"testing"
)
var (
// for this test use a custom hosts file
customHostsFile = `## Custom hosts file
# To check if everything works
1.1.1.1 my.cloudflare.domain
8.8.8.8 my.google.dns
6.6.6.6 an.evil.domain
# 12.12.12.12 commented.evil.domain # with comments
# 2.3.4.5 first.domain second.domain third.domain
5.6.7.8 first.domain second.domain third.domain
5.6.7.8 a.domain b.domain c.domain`
)
// TestParseHostsFile implicitly tests parser()
// assuming the test is executed on a computer,
// we should be able to load the default hosts file
func TestParseHostsFile(t *testing.T) {
// check for invalid path
path := "/my/custom/invalid/path/hosts"
_, err := InitFromCustomPath(path)
if err == nil {
t.Fatalf("should fail with invalid path: %s", path)
}
// parse file
hf, err := Init()
// check for errors
if err != nil {
t.Fatalf("error parsing hosts file: %s", err)
}
// load custom file for tests
hf.HostsFileLines, err = ParseHostsFileFromString(customHostsFile)
if err != nil {
t.Fatalf("error parsing custom hosts file: %s", err)
}
// check for unknown lines
// this can be a false positive if the line is actually invalid
// also we assume to have no unknown line in a standard system
// but we left it to ensure correct lines are not recognized as unknown lines
//
// edit: this now breaks the github automatic build due to https://github.com/actions/virtual-environments/issues/3353
// so we must comment this out
//
// for k, v := range hf {
// if v.Type == LineTypeUnknown {
// t.Fatalf("unable to parse line at index %d: %s", k, v.Raw)
// }
// }
// for every line,
for k, v := range hf.HostsFileLines {
// ensure addresses have a valid ip
if v.Type == LineTypeAddress {
if v.Address == nil {
t.Fatalf("address line without address at index %d: %v", k, v)
}
}
// ensure comments starts with #
if v.Type == LineTypeComment {
if !strings.HasPrefix(v.Raw, "#") {
t.Fatalf("comment line does not starts with # at index %d: %v", k, v)
}
}
}
}
// TestParseHostsFileFromString test unknown line type
// actual parsing is already tested in TestParseHostsFile()
func TestParseHostsFileFromString(t *testing.T) {
// parse custom hosts file from string
hf, err := ParseHostsFileFromString(customHostsFile)
if err != nil {
t.Fatalf("error parsing customHostsFile: %s", err)
}
// for every line,
for k, v := range hf {
// ensure addresses have a valid ip
if v.Type == LineTypeAddress {
if v.Address == nil {
t.Fatalf("address line without address at index %d: %v", k, v)
}
}
// ensure comments starts with #
if v.Type == LineTypeComment {
if !strings.HasPrefix(v.Raw, "#") {
t.Fatalf("comment line does not starts with # at index %d: %v", k, v)
}
}
}
}