misc: small fix or general refactoring i did not bother commenting

network/net_linux.go

@@ -69,12 +69,12 @@ var iwlistFreqParser = regexp.MustCompile(`^\s+Channel.([0-9]+)\s+:\s+([0-9\.]+)
 func iwlistSupportedFrequencies(iface string) ([]int, error) {
 	out, err := core.Exec("iwlist", []string{iface, "freq"})
 	if err != nil {
-		return err
+		return nil, err
 	}
 
 	freqs := make([]int, 0)
-	if output != "" {
-		scanner := bufio.NewScanner(strings.NewReader(output))
+	if out != "" {
+		scanner := bufio.NewScanner(strings.NewReader(out))
 		for scanner.Scan() {
 			line := scanner.Text()
 			matches := iwlistFreqParser.FindStringSubmatch(line)

network/net_linux_test.go

@@ -1,59 +0,0 @@
-package network
-
-import (
-	"errors"
-	"reflect"
-	"testing"
-)
-
-func TestProcessSupportedFrequencies(t *testing.T) {
-	// Actually test parseIWListFreqs; IO is lifted out.
-	cases := []struct {
-		Name          string
-		InputString   string
-		InputError    error
-		ExpectedFreqs []int
-		ExpectedError bool
-	}{
-		{
-			"Returns appropriately formatted frequencies on valid input",
-			`wlan1     11 channels in total; available frequencies :
-			Channel 01 : 2.412 GHz
-			Channel 02 : 2.417 GHz
-			Channel 03 : 2.422 GHz
-			Channel 04 : 2.427 GHz
-			Channel 05 : 2.432 GHz
-			Channel 06 : 2.437 GHz
-			Channel 07 : 2.442 GHz
-			Channel 08 : 2.447 GHz
-			Channel 09 : 2.452 GHz
-			Channel 10 : 2.457 GHz
-			Channel 11 : 2.462 GHz
-			Current Frequency:2.437 GHz (Channel 6)`,
-			nil,
-			[]int{2412, 2417, 2422, 2427, 2432, 2437, 2442, 2447, 2452, 2457, 2462},
-			false,
-		},
-		{
-			"Returns empty with an error",
-			"Doesn't matter",
-			errors.New("iwlist must have failed"),
-			[]int{},
-			true,
-		},
-	}
-	for _, test := range cases {
-		t.Run(test.Name, func(t *testing.T) {
-			freqs, err := processSupportedFrequencies(test.InputString, test.InputError)
-			if err != nil && !test.ExpectedError {
-				t.Errorf("unexpected error: %s", err)
-			}
-			if err == nil && test.ExpectedError {
-				t.Error("expected error, but got none")
-			}
-			if !test.ExpectedError && !reflect.DeepEqual(freqs, test.ExpectedFreqs) {
-				t.Errorf("got %v, want %v", freqs, test.ExpectedFreqs)
-			}
-		})
-	}
-}