diff --git a/src/test/java/io/github/linwancen/plugin/show/doc/PsiDocToStrDocTest.java b/src/test/java/io/github/linwancen/plugin/show/doc/PsiDocToStrDocTest.java
new file mode 100644
index 0000000..3297f3a
--- /dev/null
+++ b/src/test/java/io/github/linwancen/plugin/show/doc/PsiDocToStrDocTest.java
@@ -0,0 +1,52 @@
+package io.github.linwancen.plugin.show.doc;
+
+import org.jetbrains.annotations.Nullable;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.util.regex.Pattern;
+
+/**
+ * @see PsiDocToStrDoc
+ */
+class PsiDocToStrDocTest {
+
+    public static final String[] STRS = {
+            "english. next",
+            "China。next",
+            "Class.field",
+    };
+
+    public static final String[] RESULT = {
+            "english. ",
+            "China。",
+            "Class.field",
+    };
+
+    public static final Pattern[] PATTERNS = {
+            Pattern.compile(".+?(?:[。\\r\\n]|\\. )"),
+            Pattern.compile("(.+?(?:。|. ))"),
+            Pattern.compile(""),
+            Pattern.compile("C()"),
+    };
+
+    /**
+     * @see PsiDocToStrDoc#getDoc
+     */
+    @Test
+    void testGetDoc() {
+        for (int pi = 0; pi < PATTERNS.length; pi++) {
+            Pattern p = PATTERNS[pi];
+            for (int si = 0; si < STRS.length; si++) {
+                String s = STRS[si];
+                @Nullable String doc = PsiDocToStrDoc.getDoc(s, p);
+                String pattern = p.pattern();
+                System.out.println("（" + s + ", " + pattern + "): " + doc);
+                if (pi < 2) {
+                    Assertions.assertEquals(RESULT[si], doc);
+                }
+            }
+            System.out.println();
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/io/github/linwancen/plugin/show/line/PsiClassSkipTest.java b/src/test/java/io/github/linwancen/plugin/show/line/PsiClassSkipTest.java
index 4ea141b..9d5b699 100644
--- a/src/test/java/io/github/linwancen/plugin/show/line/PsiClassSkipTest.java
+++ b/src/test/java/io/github/linwancen/plugin/show/line/PsiClassSkipTest.java
@@ -13,17 +13,17 @@ import java.util.regex.Pattern;
  */
 class PsiClassSkipTest {
 
-    public static final boolean o = true;
-    public static final boolean x = false;
+    private static final boolean o = true;
+    private static final boolean x = false;
 
-    String[] names = {"java", "io.a", "io.b"};
-    Pattern[] includes = {
+    private static final String[] names = {"java", "io.a", "io.b"};
+    private static final Pattern[] includes = {
             Pattern.compile(""),
             Pattern.compile("java"),
             Pattern.compile("io"),
             Pattern.compile("java|io"),
     };
-    Pattern[] excludes = {
+    private static final Pattern[] excludes = {
             Pattern.compile(""),
             Pattern.compile("java"),
             Pattern.compile("io\\.b"),