diff --git a/test/testcandidatelist.cpp b/test/testcandidatelist.cpp
index 2ef4cc8c..28a38bc9 100644
--- a/test/testcandidatelist.cpp
+++ b/test/testcandidatelist.cpp
@@ -14,8 +14,10 @@ int selected = 0;
 
 class TestCandidateWord : public CandidateWord {
 public:
-    TestCandidateWord(int number)
-        : CandidateWord(Text(std::to_string(number))), number_(number) {}
+    TestCandidateWord(int number, Text comment = {})
+        : CandidateWord(Text(std::to_string(number))), number_(number) {
+        setComment(std::move(comment));
+    }
     void select(InputContext *) const override { selected = number_; }
 
 private:
@@ -303,9 +305,17 @@ void test_label() {
     FCITX_ASSERT(candidatelist.label(9).toString() == ",. ");
 }
 
+void test_comment() {
+    TestCandidateWord candidate(1, Text("comment"));
+    FCITX_ASSERT(candidate.text().toString() == "1");
+    FCITX_ASSERT(candidate.comment().toString() == "comment");
+    FCITX_ASSERT(candidate.textWithComment().toString() == "1 comment");
+}
+
 int main() {
     test_basic();
     test_faulty_placeholder();
     test_label();
+    test_comment();
     return 0;
 }
diff --git a/test/testtext.cpp b/test/testtext.cpp
index 179795b7..bfd27111 100644
--- a/test/testtext.cpp
+++ b/test/testtext.cpp
@@ -6,6 +6,7 @@
  */
 #include <fcitx-utils/log.h>
 #include <fcitx/text.h>
+#include "fcitx-utils/textformatflags.h"
 using namespace fcitx;
 
 void test_basic() {
@@ -33,6 +34,14 @@ void test_basic() {
     FCITX_ASSERT(lines[2].toStringForCommit() == "");
     FCITX_ASSERT(lines[3].toStringForCommit() == "Z");
     FCITX_ASSERT(lines[4].toStringForCommit() == "1");
+
+    text = Text("ABC");
+    Text another = Text("DEF", TextFormatFlag::Bold);
+    another.append("GHI", TextFormatFlag::Italic);
+    text.append(another);
+    FCITX_ASSERT(text.toString() == "ABCDEFGHI");
+    FCITX_ASSERT(text.formatAt(1) == TextFormatFlag::Bold);
+    FCITX_ASSERT(text.formatAt(2) == TextFormatFlag::Italic);
 }
 
 void test_normalize() {