diff --git a/weixin-java-common/src/main/java/me/chanjar/weixin/common/util/fs/FileUtils.java b/weixin-java-common/src/main/java/me/chanjar/weixin/common/util/fs/FileUtils.java
index 65bc48da1..4a267153c 100644
--- a/weixin-java-common/src/main/java/me/chanjar/weixin/common/util/fs/FileUtils.java
+++ b/weixin-java-common/src/main/java/me/chanjar/weixin/common/util/fs/FileUtils.java
@@ -11,6 +11,9 @@ import java.util.Base64;
 
 import static org.apache.commons.io.FileUtils.openOutputStream;
 
+/**
+ * @author Daniel Qian
+ */
 public class FileUtils {
 
   /**
@@ -21,7 +24,8 @@ public class FileUtils {
    * @param ext         扩展名
    * @param tmpDirFile  临时文件夹目录
    */
-  public static File createTmpFile(InputStream inputStream, String name, String ext, File tmpDirFile) throws IOException {
+  public static File createTmpFile(InputStream inputStream, String name, String ext, File tmpDirFile)
+    throws IOException {
     File resultFile = File.createTempFile(name, '.' + ext, tmpDirFile);
 
     resultFile.deleteOnExit();
diff --git a/weixin-java-common/src/test/java/me/chanjar/weixin/common/util/fs/FileUtilsTest.java b/weixin-java-common/src/test/java/me/chanjar/weixin/common/util/fs/FileUtilsTest.java
new file mode 100644
index 000000000..5a25fb149
--- /dev/null
+++ b/weixin-java-common/src/test/java/me/chanjar/weixin/common/util/fs/FileUtilsTest.java
@@ -0,0 +1,34 @@
+package me.chanjar.weixin.common.util.fs;
+
+import org.apache.commons.io.IOUtils;
+import org.testng.annotations.Test;
+
+import java.io.ByteArrayInputStream;
+import java.io.File;
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.nio.file.Files;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class FileUtilsTest {
+
+  @Test
+  public void testCreateTmpFile() throws IOException {
+    String strings = "abc";
+    File tmpFile = FileUtils.createTmpFile(new ByteArrayInputStream(strings.getBytes()), "name", "txt");
+    System.out.println(tmpFile);
+    List<String> lines = IOUtils.readLines(Files.newInputStream(tmpFile.toPath()), Charset.defaultCharset());
+    assertThat(lines).hasSize(1);
+    assertThat(lines.get(0)).isEqualTo(strings);
+  }
+
+  @Test
+  public void testTestCreateTmpFile() {
+  }
+
+  @Test
+  public void testImageToBase64ByStream() {
+  }
+}