remove unnecessary conditional statement, add test case

Author: cafe24-jspark03

src/main/java/com/joonsang/graylog/GraylogQuery.java

@@ -393,9 +393,7 @@ private String escape(String input) {
         };
 
         for (String meta: metaCharacters) {
-            if (input.contains(meta)) {
-                input = input.replace(meta, "\\" + meta);
-            }
+            input = input.replace(meta, "\\" + meta);
         }
 
         return input;

src/test/java/com/joonsang/graylog/GraylogQueryTests.java

@@ -256,4 +256,18 @@ public void TC_019_APPEND() {
             .as("TC_019_APPEND")
             .isEqualTo(expect);
     }
+
+    @Test
+    public void TC_020_ESCAPING() {
+        GraylogQuery query = GraylogQuery.builder()
+            .field("content_type", "application/json")
+            .and()
+            .field("response_body", "{\"nickname\": \"[*test] John Doe\", \"message\": \"hello?\"}");
+
+        String expect = "content_type:\"application\\/json\" AND response_body:\"\\{\\\"nickname\\\"\\\\: \\\"\\[\\*test\\] John Doe\\\", \\\"message\\\"\\\\: \\\"hello\\?\\\"\\}\"";
+
+        assertThat(query.build())
+            .as("TC_020_SANITIZE")
+            .isEqualTo(expect);
+    }
 }