add comment tests

comment/comment_test.go

@@ -0,0 +1,27 @@
+package comment_test
+
+import (
+	"testing"
+
+	"github.com/z7zmey/php-parser/comment"
+	"github.com/z7zmey/php-parser/node"
+)
+
+func TestComments(t *testing.T) {
+	n := node.NewIdentifier("test")
+
+	commentGroup := []comment.Comment{
+		comment.NewDocComment("/** hello world */"),
+		comment.NewPlainComment("// hello world"),
+	}
+
+	comments := comment.Comments{}
+	comments.AddComments(n, commentGroup)
+
+	if comments[n][0].String() != "/** hello world */" {
+		t.Errorf("expected and actual are not equal\n")
+	}
+	if comments[n][1].String() != "// hello world" {
+		t.Errorf("expected and actual are not equal\n")
+	}
+}