diff --git a/src/test/java/com/googlesource/gerrit/plugins/findowners/FindOwners.java b/src/test/java/com/googlesource/gerrit/plugins/findowners/FindOwners.java
index d414755..872cda4 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/findowners/FindOwners.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/findowners/FindOwners.java
@@ -182,12 +182,21 @@
     return c.findApproval(accountCache, db);
   }
 
-  // Remove '"' and space; replace '\n' with ' '; ignore "owner_revision" and "HostName:*".
+  // To simplify test case code, the REST API returned JSON string is filtered to
+  // remove '\t', ' ' and '"', but replace "\\\"" with '"',
+  // replace '\n' with space, remove "owner_revision:*" and "HostName:*",
+  // and replace some unicode with simple characters.
   protected static String filteredJson(String json) {
-    return json.replaceAll("[\" ]*", "")
+    return json.replaceAll("[\t ]", "")
+        .replace("\\\"", "\t")
+        .replace("\"", "")
+        .replace('\t', '"')
         .replace('\n', ' ')
         .replaceAll("owner_revision:[^ ]* ", "")
-        .replaceAll("HostName:[^ ]*, ", "");
+        .replaceAll("HostName:[^ ]*, ", "")
+        .replace("\\u0027", "'")
+        .replace("\\u003d", "=")
+        .replace("\\u003e", ">");
   }
 
   protected static String filteredJson(RestResponse response) throws Exception {
diff --git a/src/test/java/com/googlesource/gerrit/plugins/findowners/IncludeIT.java b/src/test/java/com/googlesource/gerrit/plugins/findowners/IncludeIT.java
index be64ad3..192fbf6 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/findowners/IncludeIT.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/findowners/IncludeIT.java
@@ -63,7 +63,7 @@
             + getRepoFileLog(projectName + ":refs/heads/master:./OWNERS", "OWNERS:(...)")
             + "parseLine:include:P1/P2:f1, "
             + "getRepoFile:P1/P2:refs/heads/master:f1, "
-            + "hasReadAccessException:project\\u0027P1/P2\\u0027isunavailable, " // cannot read
+            + "hasReadAccessException:project'P1/P2'isunavailable, " // cannot read
             + "parseLine:include:(), " // missing file is treated as empty
             + concat("parseLine:include:", projectName, ":./d1/d2/../../f2, ")
             + getRepoFileLog(projectName + ":refs/heads/master:f2", "f2(NOTFOUND)")
@@ -114,7 +114,7 @@
             + getRepoFileLog(projectName + ":refs/heads/master:./OWNERS", "OWNERS:(...)")
             + "parseLine:include:P1/P2:f1, "
             + "getRepoFile:P1/P2:refs/heads/master:f1, "
-            + "hasReadAccessException:project\\u0027P1/P2\\u0027isunavailable, "
+            + "hasReadAccessException:project'P1/P2'isunavailable, "
             + "parseLine:include:(), " // P1/P2 is still not found
             + concat("parseLine:include:", projectName, ":./d1/d2/../../f2, ")
             + getRepoFileLog(projectName + ":refs/heads/master:f2", "f2:(...)")