添加 api。

src/test/java/xyz/zhouxy/plusone/commons/util/RestfulResultTest.java

@@ -0,0 +1,34 @@
+package xyz.zhouxy.plusone.commons.util;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+class RestfulResultTest {
+
+    @Test
+    void testSuccessIf() {
+        String str = null;
+        RestfulResult result = RestfulResult.successIf(str != null, "成功")
+                .orError();
+        System.out.println(result);
+        assertEquals(RestfulResult.DEFAULT_ERROR_STATUS, result.getStatus());
+
+        result = RestfulResult.successIf(str != null, "成功")
+                .orError(2333, "失败");
+        System.out.println(result);
+        assertEquals(2333, result.getStatus());
+        assertEquals("失败", result.getMessage());
+
+        str = "";
+        result = RestfulResult.successIf(str != null, "成功")
+                .orError();
+        System.out.println(result);
+        assertEquals(RestfulResult.SUCCESS_STATUS, result.getStatus());
+
+        result = RestfulResult.successIf(str != null, "成功", str)
+                .orError(2333, "失败");
+        System.out.println(result);
+        assertEquals("成功", result.getMessage());
+    }
+}