diff --git a/scfs-api-core/src/main/java/com/czcb/scfs/api/core/util/Nonce.java b/scfs-api-core/src/main/java/com/czcb/scfs/api/core/util/Nonce.java
index 5f5e117..c0628e1 100644
--- a/scfs-api-core/src/main/java/com/czcb/scfs/api/core/util/Nonce.java
+++ b/scfs-api-core/src/main/java/com/czcb/scfs/api/core/util/Nonce.java
@@ -17,9 +17,4 @@ public class Nonce {
     public static String ofNonce() {
         return UUID.randomUUID().toString().replace("-", "").toLowerCase();
     }
-
-    public static String ofShortNonce() {
-        // TODO　短ID
-        throw new IllegalArgumentException();
-    }
 }
diff --git a/scfs-api-core/src/test/java/com/czcb/scfs/api/core/cipher/SignatureResultTest.java b/scfs-api-core/src/test/java/com/czcb/scfs/api/core/cipher/SignatureResultTest.java
index 263686f..772b678 100644
--- a/scfs-api-core/src/test/java/com/czcb/scfs/api/core/cipher/SignatureResultTest.java
+++ b/scfs-api-core/src/test/java/com/czcb/scfs/api/core/cipher/SignatureResultTest.java
@@ -16,4 +16,10 @@ class SignatureResultTest {
         SignatureResult result = new SignatureResult("6CDDAA92CAD75998325027647847330C1756291", "123456");
         Assertions.assertEquals("{\"certificateSerial\":\"6CDDAA92CAD75998325027647847330C1756291\",\"signature\":\"123456\"}", result.toString());
     }
+
+    @Test
+    void getCertificateSerial() {
+        SignatureResult result = new SignatureResult("6CDDAA92CAD75998325027647847330C1756291", "123456");
+        Assertions.assertEquals("6CDDAA92CAD75998325027647847330C1756291", result.getCertificateSerial());
+    }
 }
\ No newline at end of file
diff --git a/scfs-api-core/src/test/java/com/czcb/scfs/api/core/http/HttpStatusTest.java b/scfs-api-core/src/test/java/com/czcb/scfs/api/core/http/HttpStatusTest.java
new file mode 100644
index 0000000..1d26408
--- /dev/null
+++ b/scfs-api-core/src/test/java/com/czcb/scfs/api/core/http/HttpStatusTest.java
@@ -0,0 +1,104 @@
+package com.czcb.scfs.api.core.http;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+class HttpStatusTest {
+    @Test
+    void toStringTest() {
+        HttpStatus status = HttpStatus.valueOf(101);
+        Assertions.assertEquals("101 SWITCHING_PROTOCOLS", status.toString());
+    }
+
+    @Test
+    void value() {
+        HttpStatus status = HttpStatus.valueOf(101);
+        Assertions.assertEquals(101, status.value());
+    }
+
+    @Test
+    void series() {
+        HttpStatus.Series series = HttpStatus.Series.valueOf(HttpStatus.ACCEPTED);
+        Assertions.assertEquals(HttpStatus.Series.SUCCESSFUL, series);
+    }
+
+    @Test
+    void getReasonPhrase() {
+        HttpStatus status = HttpStatus.valueOf(101);
+        Assertions.assertEquals("Switching Protocols", status.getReasonPhrase());
+    }
+
+    @Test
+    void is1xxInformational() {
+        HttpStatus status = HttpStatus.valueOf(101);
+        Assertions.assertTrue(status.is1xxInformational());
+    }
+
+    @Test
+    void is2xxSuccessful() {
+        HttpStatus status = HttpStatus.valueOf(200);
+        Assertions.assertTrue(status.is2xxSuccessful());
+    }
+
+    @Test
+    void is3xxRedirection() {
+        HttpStatus status = HttpStatus.valueOf(302);
+        Assertions.assertTrue(status.is3xxRedirection());
+    }
+
+    @Test
+    void is4xxClientError() {
+        HttpStatus status = HttpStatus.valueOf(404);
+        Assertions.assertTrue(status.is4xxClientError());
+    }
+
+    @Test
+    void is5xxServerError() {
+        HttpStatus status = HttpStatus.valueOf(500);
+        Assertions.assertTrue(status.is5xxServerError());
+    }
+
+    @Test
+    void isError() {
+        HttpStatus status = HttpStatus.valueOf(500);
+        Assertions.assertTrue(status.isError());
+
+        status = HttpStatus.valueOf(404);
+        Assertions.assertTrue(status.isError());
+    }
+
+    @Test
+    void valueOf() {
+        HttpStatus.Series series = HttpStatus.Series.valueOf(300);
+        Assertions.assertNotNull(series);
+
+        Assertions.assertThrows(IllegalArgumentException.class, () -> {
+            HttpStatus.Series.valueOf(0);
+        });
+    }
+
+    @Test
+    void resolve() {
+        HttpStatus status = HttpStatus.resolve(200);
+        Assertions.assertNotNull(status);
+        Assertions.assertEquals("OK", status.getReasonPhrase());
+        Assertions.assertNull(HttpStatus.resolve(0));
+    }
+
+    @Test
+    void values() {
+        HttpStatus.Series series = HttpStatus.Series.valueOf(300);
+        Assertions.assertEquals(3, series.value());
+    }
+
+    @Test
+    void testValueOf() {
+        HttpStatus status = HttpStatus.valueOf(200);
+        Assertions.assertNotNull(status);
+        Assertions.assertEquals("OK", status.getReasonPhrase());
+
+        Assertions.assertThrows(IllegalArgumentException.class, () -> {
+            HttpStatus.valueOf(0);
+        });
+    }
+}
\ No newline at end of file
diff --git a/scfs-api-core/src/test/java/com/czcb/scfs/api/core/util/PemFileTest.java b/scfs-api-core/src/test/java/com/czcb/scfs/api/core/util/PemFileTest.java
index 9998b6c..70e5c10 100644
--- a/scfs-api-core/src/test/java/com/czcb/scfs/api/core/util/PemFileTest.java
+++ b/scfs-api-core/src/test/java/com/czcb/scfs/api/core/util/PemFileTest.java
@@ -10,6 +10,8 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
 import java.security.PrivateKey;
+import java.security.cert.X509Certificate;
+import java.util.regex.Pattern;
 
 class PemFileTest {
 
@@ -55,4 +57,17 @@ class PemFileTest {
             file.delete();
         }
     }
+
+    @Test
+    void loadX509FromString() {
+        Assertions.assertThrows(IllegalArgumentException.class, () -> PemFile.loadX509FromString(KeyText.CERTIFICATE_TEXT_RSA, null));
+        Assertions.assertThrows(NullPointerException.class, () -> PemFile.loadX509FromString(null));
+    }
+
+    @Test
+    void getSerialNumber() {
+        X509Certificate certificate = PemFile.loadX509FromString(KeyText.CERTIFICATE_TEXT_RSA);
+        String text = PemFile.getSerialNumber(certificate);
+        Assertions.assertTrue(Pattern.matches("[A-Z0-9]+", text));
+    }
 }
\ No newline at end of file