fix decoder + tests

internal/cnf/parser/nginx/encoder.go

@@ -68,7 +68,6 @@ func (e *encoder) Encode(v interface{}) error {
 		if line == nil {
 			repr = append(repr, []byte("}\n\n")...)
 			// Note: new line after section for readability
-			indent--
 
 			// 3. comments
 		} else if line.Type == COMMENT {
@@ -92,7 +91,7 @@ func (e *encoder) Encode(v interface{}) error {
 
 			// push children lines in reverse order
 			if len(line.Lines) > 0 {
-				for l := len(line.Lines); l > 0; l-- {
+				for l := len(line.Lines) - 1; l >= 0; l-- {
 					stack = append(stack, line.Lines[l])
 				}
 			}

internal/cnf/parser/nginx/encoder_test.go

@@ -48,6 +48,14 @@ func TestDecodeEncode(t *testing.T) {
 		{"; some comment  \n", "; some comment\n"},
 		{"; some comment \t\n", "; some comment\n"},
 		{"\t; some comment {\n", "; some comment {\n"},
+
+		{"a{\n}\n", "a {\n}\n\n"},
+		{"a{\n\n}\n", "a {\n}\n\n"},
+		{"a{\n; some comment\n}\n", "a {\n\t; some comment\n}\n\n"},
+		{"a{\n; some comment\n #another comment\n}\n", "a {\n\t; some comment\n\t#another comment\n}\n\n"},
+		{"a{\nb{\n}\n}\n", "a {\n\tb {\n\t}\n\n}\n\n"},
+		{"a{\n\tb{\n\t}\n}\n", "a {\n\tb {\n\t}\n\n}\n\n"},
+		{"a{\nb{\nc{\n}\n}\n}\n", "a {\n\tb {\n\t\tc {\n\t\t}\n\n\t}\n\n}\n\n"},
 	}
 
 	for i, test := range tests {
@@ -73,7 +81,7 @@ func TestDecodeEncode(t *testing.T) {
 
 		// check equality
 		if w.String() != test.Output {
-			t.Errorf("[%d] expected '%s', got '%s'", i, escape(test.Output), escape(w.String()))
+			t.Errorf("[%d] expected '%s', got '%s'", i, (test.Output), (w.String()))
 		}
 
 	}