headers: add negative unit tests

pkg/headers/keyval.go

@@ -6,15 +6,11 @@ import (
 )
 
 func findValue(str string, separator byte) (string, string, error) {
-	if str == "" {
-		return "", "", nil
-	}
-
-	if str[0] == '"' {
+	if len(str) > 0 && str[0] == '"' {
 		i := 1
 		for {
 			if i >= len(str) {
-				return "", "", fmt.Errorf("apices not closed (%v)", str)
+				return "", "", fmt.Errorf("apexes not closed (%v)", str)
 			}
 
 			if str[i] == '"' {
@@ -41,7 +37,7 @@ func keyValParse(str string, separator byte) (map[string]string, error) {
 	for len(str) > 0 {
 		i := strings.IndexByte(str, '=')
 		if i < 0 {
-			return nil, fmt.Errorf("unable to find key '%v'", str)
+			return nil, fmt.Errorf("unable to find key (%v)", str)
 		}
 		var k string
 		k, str = str[:i], str[i+1:]

pkg/headers/keyval_test.go

@@ -6,7 +6,8 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-var casesKeyVal = []struct {
+func TestKeyValParse(t *testing.T) {
+	for _, ca := range []struct {
 		name string
 		s    string
 		kvs  map[string]string
@@ -28,7 +29,7 @@ var casesKeyVal = []struct {
 			},
 		},
 		{
-		"with apices",
+			"with apexes",
 			`key1="v1", key2=v2`,
 			map[string]string{
 				"key1": "v1",
@@ -36,7 +37,7 @@ var casesKeyVal = []struct {
 			},
 		},
 		{
-		"with apices and comma",
+			"with apexes and comma",
 			`key1="v,1", key2="v2"`,
 			map[string]string{
 				"key1": "v,1",
@@ -44,17 +45,14 @@ var casesKeyVal = []struct {
 			},
 		},
 		{
-		"with apices and equal",
+			"with apexes and equal",
 			`key1="v=1", key2="v2"`,
 			map[string]string{
 				"key1": "v=1",
 				"key2": "v2",
 			},
 		},
-}
-
-func TestKeyValParse(t *testing.T) {
-	for _, ca := range casesKeyVal {
+	} {
 		t.Run(ca.name, func(t *testing.T) {
 			kvs, err := keyValParse(ca.s, ',')
 			require.NoError(t, err)
@@ -62,3 +60,27 @@ func TestKeyValParse(t *testing.T) {
 		})
 	}
 }
+
+func TestKeyValParseError(t *testing.T) {
+	for _, ca := range []struct {
+		name string
+		s    string
+		err  string
+	}{
+		{
+			"apexes not closed",
+			`key1="v,1`,
+			"apexes not closed (\"v,1)",
+		},
+		{
+			"no key",
+			`value`,
+			"unable to find key (value)",
+		},
+	} {
+		t.Run(ca.name, func(t *testing.T) {
+			_, err := keyValParse(ca.s, ',')
+			require.Equal(t, ca.err, err.Error())
+		})
+	}
+}