Issue 5931 - Create tests for util package

adblockplussbrowser/src/main/java/org/adblockplus/sbrowser/contentblocker/engine/JSONPrefs.java

Index: adblockplussbrowser/src/main/java/org/adblockplus/sbrowser/contentblocker/engine/JSONPrefs.java
===================================================================
new file mode 100644
--- /dev/null
+++ b/adblockplussbrowser/src/main/java/org/adblockplus/sbrowser/contentblocker/engine/JSONPrefs.java
@@ -0,0 +1,59 @@
+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-present eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.adblockplus.sbrowser.contentblocker.engine;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+final class JSONPrefs
+{
+  private final JSONObject jsonObject;
+
+  private JSONPrefs(JSONObject object)
+  {
+    this.jsonObject = object;
+  }
+
+  public String getDefaults(final String key)
+  {
+    try
+    {
+      final JSONObject defaults = this.jsonObject.getJSONObject("defaults");
+      return defaults != null && defaults.has(key) ? defaults.getString(key) : null;
+    }
+    catch (final JSONException e)
+    {
+      return null;
+    }
+  }
+
+  public static JSONPrefs create(final InputStream instream) throws IOException
+  {
+    try
+    {
+      return new JSONPrefs(new JSONObject(Engine.readFileAsString(instream)));
+    }
+    catch (JSONException e)
+    {
+      throw new IOException("Failed to parse JSON", e);
+    }
+  }
+}