Fix issue in FindEntry that causes extensions and alias crash

internal/config/config_map.go

@@ -68,13 +68,18 @@ func (cm *ConfigMap) FindEntry(key string) (ce *ConfigEntry, err error) {
 
 	ce = &ConfigEntry{}
 
-	topLevelKeys := cm.Root.Content
-	for i, v := range topLevelKeys {
+	// Content slice goes [key1, value1, key2, value2, ...]
+	topLevelPairs := cm.Root.Content
+	for i, v := range topLevelPairs {
+		// Skip every other slice item since we only want to check against keys
+		if i%2 != 0 {
+			continue
+		}
 		if v.Value == key {
 			ce.KeyNode = v
 			ce.Index = i
-			if i+1 < len(topLevelKeys) {
-				ce.ValueNode = topLevelKeys[i+1]
+			if i+1 < len(topLevelPairs) {
+				ce.ValueNode = topLevelPairs[i+1]
 			}
 			return
 		}

internal/config/config_map_test.go

@@ -0,0 +1,65 @@
+package config
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"gopkg.in/yaml.v3"
+)
+
+func TestFindEntry(t *testing.T) {
+	tests := []struct {
+		name    string
+		key     string
+		output  string
+		wantErr bool
+	}{
+		{
+			name:   "find key",
+			key:    "valid",
+			output: "present",
+		},
+		{
+			name:    "find key that is not present",
+			key:     "invalid",
+			wantErr: true,
+		},
+		{
+			name:   "find key with blank value",
+			key:    "blank",
+			output: "",
+		},
+		{
+			name:   "find key that has same content as a value",
+			key:    "same",
+			output: "logical",
+		},
+	}
+
+	for _, tt := range tests {
+		cm := ConfigMap{Root: testYaml()}
+		t.Run(tt.name, func(t *testing.T) {
+			out, err := cm.FindEntry(tt.key)
+			if tt.wantErr {
+				assert.EqualError(t, err, "not found")
+				return
+			}
+			assert.NoError(t, err)
+			fmt.Println(out)
+			assert.Equal(t, tt.output, out.ValueNode.Value)
+		})
+	}
+}
+
+func testYaml() *yaml.Node {
+	var root yaml.Node
+	var data = `
+valid: present
+erroneous: same
+blank:
+same: logical
+`
+	_ = yaml.Unmarshal([]byte(data), &root)
+	return root.Content[0]
+}