diff --git a/scfs-api-core/src/test/java/com/czcb/scfs/api/core/cipher/CipherTypeTest.java b/scfs-api-core/src/test/java/com/czcb/scfs/api/core/cipher/CipherTypeTest.java
new file mode 100644
index 0000000..1ada781
--- /dev/null
+++ b/scfs-api-core/src/test/java/com/czcb/scfs/api/core/cipher/CipherTypeTest.java
@@ -0,0 +1,13 @@
+package com.czcb.scfs.api.core.cipher;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+class CipherTypeTest {
+
+    @Test
+    void getValue() {
+        Assertions.assertEquals("sm", CipherType.SM.getValue());
+        Assertions.assertEquals("rsa", CipherType.RSA.getValue());
+    }
+}
\ 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 cca561d..41631f3 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
@@ -54,7 +54,7 @@ class PemFileTest {
             String privateKey = PemFile.readPrivateKeyStringFromPath(file.getPath());
             Assertions.assertNotNull(PemFile.loadPrivateKeyFromString(privateKey));
         } finally {
-            file.delete();
+            Assertions.assertTrue(file.delete());
         }
     }
 
@@ -75,4 +75,32 @@ class PemFileTest {
     void testLoadPrivateKeyFromStream() {
         Assertions.assertThrows(NullPointerException.class, () -> PemFile.loadPrivateKeyFromStream(null));
     }
+
+    @Test
+    void loadPrivateKeyFromAbsolutePathTest() throws IOException {
+        File file = File.createTempFile("Test.", "rsa_channel_private_key.pem");
+        try (FileOutputStream outputStream = new FileOutputStream(file)) {
+            outputStream.write(KeyText.PRIVATE_TEXT_RSA.getBytes(StandardCharsets.UTF_8));
+            outputStream.flush();
+
+            PrivateKey privateKey = PemFile.loadPrivateKeyFromAbsolutePath(file.getPath());
+            Assertions.assertNotNull(privateKey);
+        } finally {
+            Assertions.assertTrue(file.delete());
+        }
+    }
+
+    @Test
+    void loadX509FromAbsolutePath() throws IOException {
+        File file = File.createTempFile("Test.", "rsa.pem");
+        try (FileOutputStream outputStream = new FileOutputStream(file)) {
+            outputStream.write(KeyText.CERTIFICATE_TEXT_RSA.getBytes(StandardCharsets.UTF_8));
+            outputStream.flush();
+
+            X509Certificate certificate = PemFile.loadX509FromAbsolutePath(file.getPath());
+            Assertions.assertNotNull(certificate);
+        } finally {
+            Assertions.assertTrue(file.delete());
+        }
+    }
 }
\ No newline at end of file
diff --git a/scfs-api-core/src/test/java/com/czcb/scfs/api/core/util/StopWatchTest.java b/scfs-api-core/src/test/java/com/czcb/scfs/api/core/util/StopWatchTest.java
index 3221804..2393fab 100644
--- a/scfs-api-core/src/test/java/com/czcb/scfs/api/core/util/StopWatchTest.java
+++ b/scfs-api-core/src/test/java/com/czcb/scfs/api/core/util/StopWatchTest.java
@@ -66,4 +66,22 @@ class StopWatchTest {
         Assertions.assertEquals(1, stopWatch.getTaskInfo().length);
         Assertions.assertNotEquals(0, stopWatch.getTaskInfo()[0].getTimeSeconds());
     }
+
+    @Test
+    void start4() {
+        StopWatch stopWatch = new StopWatch("11", false).start();
+        Assertions.assertThrows(UnsupportedOperationException.class, stopWatch::getTaskInfo);
+        Assertions.assertThrows(IllegalStateException.class, stopWatch::getLastTaskInfo);
+        Assertions.assertThrows(IllegalStateException.class, stopWatch::getLastTaskTimeNanos);
+        Assertions.assertThrows(IllegalStateException.class, stopWatch::getLastTaskTimeMillis);
+        Assertions.assertThrows(IllegalStateException.class, stopWatch::getLastTaskName);
+        Assertions.assertTrue(stopWatch.isRunning());
+        Assertions.assertThrows(IllegalStateException.class, stopWatch::start);
+    }
+
+    @Test
+    void start5() {
+        StopWatch stopWatch = new StopWatch("11", false);
+        Assertions.assertThrows(IllegalStateException.class, stopWatch::stop);
+    }
 }
\ No newline at end of file