diff --git a/sources/Data/TEST_JSON.uc b/sources/Data/TEST_JSON.uc
new file mode 100644
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--- /dev/null
+++ b/sources/Data/TEST_JSON.uc
@@ -0,0 +1,710 @@
+/**
+ *      Set of tests for JSON data storage, implemented via
+ *  `JSONObject` and `JSONArray`.
+ *      Copyright 2020 Anton Tarasenko
+ *------------------------------------------------------------------------------
+ * This file is part of Acedia.
+ *
+ * Acedia is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Acedia 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 Acedia.  If not, see <https://www.gnu.org/licenses/>.
+ */
+class TEST_JSON extends TestCase
+    abstract;
+
+protected static function TESTS()
+{
+    local JSONObject jsonData;
+    jsonData = new class'JSONObject';
+    Test_ObjectGetSetRemove();
+    Test_ArrayGetSetRemove();
+}
+
+protected static function Test_ObjectGetSetRemove()
+{
+    SubTest_Undefined();
+    SubTest_StringGetSetRemove();
+    SubTest_BooleanGetSetRemove();
+    SubTest_NumberGetSetRemove();
+    SubTest_NullGetSetRemove();
+    SubTest_MultipleVariablesGetSet();
+    SubTest_Object();
+}
+
+protected static function Test_ArrayGetSetRemove()
+{
+    Context("Testing get/set/remove functions for JSON arrays");
+    SubTest_ArrayUndefined();
+    SubTest_ArrayStringGetSetRemove();
+    SubTest_ArrayBooleanGetSetRemove();
+    SubTest_ArrayNumberGetSetRemove();
+    SubTest_ArrayNullGetSetRemove();
+    SubTest_ArrayMultipleVariablesStorage();
+    SubTest_ArrayMultipleVariablesRemoval();
+    SubTest_ArrayRemovingMultipleVariablesAtOnce();
+    SubTest_ArrayExpansions();
+}
+
+protected static function SubTest_Undefined()
+{
+    local JSONObject testJSON;
+    testJSON = new class'JSONObject';
+    Context("Testing how `JSONObject` handles undefined values");
+    Issue("Undefined variable doesn't have proper type.");
+    TEST_ExpectTrue(testJSON.GetType("some_var") == JSON_Undefined);
+
+    Issue("There is a variable in an empty object after `GetType` call.");
+    TEST_ExpectTrue(testJSON.GetType("some_var") == JSON_Undefined);
+
+    Issue("Getters don't return default values for undefined variables.");
+    TEST_ExpectTrue(testJSON.GetNumber("some_var", 0) == 0);
+    TEST_ExpectTrue(testJSON.GetString("some_var", "") == "");
+    TEST_ExpectTrue(testJSON.GetBoolean("some_var", false) == false);
+    TEST_ExpectNone(testJSON.GetObject("some_var"));
+    TEST_ExpectNone(testJSON.GetArray("some_var"));
+}
+
+protected static function SubTest_BooleanGetSetRemove()
+{
+    local JSONObject testJSON;
+    testJSON = new class'JSONObject';
+    testJSON.SetBoolean("some_boolean", true);
+
+    Context("Testing `JSONObject`'s get/set/remove functions for" @
+            "boolean variables");
+    Issue("Boolean type isn't properly set by `SetBoolean`");
+    TEST_ExpectTrue(testJSON.GetType("some_boolean") == JSON_Boolean);
+
+    Issue("Variable value is incorrectly assigned by `SetBoolean`");
+    TEST_ExpectTrue(testJSON.GetBoolean("some_boolean") == true);
+
+    Issue("Variable value isn't correctly reassigned by `SetBoolean`");
+    testJSON.SetBoolean("some_boolean", false);
+    TEST_ExpectTrue(testJSON.GetBoolean("some_boolean") == false);
+
+    Issue(  "Getting boolean variable as a wrong type" @
+            "doesn't yield default value");
+    TEST_ExpectTrue(testJSON.GetNumber("some_boolean", 7) == 7);
+
+    Issue("Boolean variable isn't being properly removed");
+    testJSON.RemoveValue("some_boolean");
+    TEST_ExpectTrue(testJSON.GetType("some_boolean") == JSON_Undefined);
+
+    Issue(  "Getters don't return default value for missing key that" @
+            "previously stored boolean value, that got removed");
+    TEST_ExpectTrue(testJSON.GetBoolean("some_boolean", true) == true);
+}
+
+protected static function SubTest_StringGetSetRemove()
+{
+    local JSONObject testJSON;
+    testJSON = new class'JSONObject';
+    testJSON.SetString("some_string", "first string");
+
+    Context("Testing `JSONObject`'s get/set/remove functions for" @
+            "string variables");
+    Issue("String type isn't properly set by `SetString`");
+    TEST_ExpectTrue(testJSON.GetType("some_string") == JSON_String);
+
+    Issue("Value is incorrectly assigned by `SetString`");
+    TEST_ExpectTrue(testJSON.GetString("some_string") == "first string");
+
+    Issue(  "Providing default variable value makes 'GetString'" @
+            "return wrong value");
+    TEST_ExpectTrue(    testJSON.GetString("some_string", "alternative")
+                    ==  "first string");
+
+    Issue("Variable value isn't correctly reassigned by `SetString`");
+    testJSON.SetString("some_string", "new string!~");
+    TEST_ExpectTrue(testJSON.GetString("some_string") == "new string!~");
+
+    Issue(  "Getting string variable as a wrong type" @
+            "doesn't yield default value");
+    TEST_ExpectTrue(testJSON.GetBoolean("some_string", true) == true);
+
+    Issue("String variable isn't being properly removed");
+    testJSON.RemoveValue("some_string");
+    TEST_ExpectTrue(testJSON.GetType("some_string") == JSON_Undefined);
+
+    Issue(  "Getters don't return default value for missing key that" @
+            "previously stored string value, but got removed");
+    TEST_ExpectTrue(testJSON.GetString("some_string", "other") == "other");
+}
+
+protected static function SubTest_NumberGetSetRemove()
+{
+    local JSONObject testJSON;
+    testJSON = new class'JSONObject';
+    testJSON.SetNumber("some_number", 3.5);
+
+    Context("Testing `JSONObject`'s get/set/remove functions for" @
+            "number variables");
+    Issue("Number type isn't properly set by `SetNumber`");
+    TEST_ExpectTrue(testJSON.GetType("some_number") == JSON_Number);
+
+    Issue("Value is incorrectly assigned by `SetNumber`");
+    TEST_ExpectTrue(testJSON.GetNumber("some_number") == 3.5);
+
+    Issue(  "Providing default variable value makes 'GetNumber'" @
+            "return wrong value");
+    TEST_ExpectTrue(testJSON.GetNumber("some_number", 5) == 3.5);
+
+    Issue("Variable value isn't correctly reassigned by `SetNumber`");
+    testJSON.SetNumber("some_number", 7);
+    TEST_ExpectTrue(testJSON.GetNumber("some_number") == 7);
+
+    Issue(  "Getting number variable as a wrong type" @
+            "doesn't yield default value.");
+    TEST_ExpectTrue(testJSON.GetString("some_number", "default") == "default");
+
+    Issue("Number type isn't being properly removed");
+    testJSON.RemoveValue("some_number");
+    TEST_ExpectTrue(testJSON.GetType("some_number") == JSON_Undefined);
+
+    Issue(  "Getters don't return default value for missing key that" @
+            "previously stored number value, that got removed");
+    TEST_ExpectTrue(testJSON.GetNumber("some_number", 13) == 13);
+}
+
+protected static function SubTest_NullGetSetRemove()
+{
+    local JSONObject testJSON;
+    testJSON = new class'JSONObject';
+
+    Context("Testing `JSONObject`'s get/set/remove functions for" @
+            "null values");
+    Issue("Undefined variable is incorrectly considered `null`");
+    TEST_ExpectFalse(testJSON.IsNull("some_var"));
+
+    Issue("Number variable is incorrectly considered `null`");
+    testJSON.SetNumber("some_var", 4);
+    TEST_ExpectFalse(testJSON.IsNull("some_var"));
+
+    Issue("Boolean variable is incorrectly considered `null`");
+    testJSON.SetBoolean("some_var", true);
+    TEST_ExpectFalse(testJSON.IsNull("some_var"));
+
+    Issue("String variable is incorrectly considered `null`");
+    testJSON.SetString("some_var", "string");
+    TEST_ExpectFalse(testJSON.IsNull("some_var"));
+    
+    Issue("Null value is incorrectly assigned");
+    testJSON.SetNull("some_var");
+    TEST_ExpectTrue(testJSON.IsNull("some_var"));
+
+    Issue("Null type isn't properly set by `SetNumber`");
+    TEST_ExpectTrue(testJSON.GetType("some_var") == JSON_Null);
+
+    Issue("Null value isn't being properly removed.");
+    testJSON.RemoveValue("some_var");
+    TEST_ExpectTrue(testJSON.GetType("some_var") == JSON_Undefined);
+}
+
+protected static function SubTest_MultipleVariablesGetSet()
+{
+    local int           i;
+    local bool          correctValue, allValuesCorrect;
+    local JSONObject    testJSON;
+    testJSON = new class'JSONObject';
+    Context("Testing how `JSONObject` handles addition, change and removal" @
+            "of relatively large (hundreds) number of variables");
+    for (i = 0;i < 2000; i += 1)
+    {
+        testJSON.SetNumber("num" $ string(i), 4 * i*i - 2.6 * i + 0.75);
+    }
+    for (i = 0;i < 500; i += 1)
+    {
+        testJSON.SetString("num" $ string(i), "str" $ string(Sin(i)));
+    }
+    for (i = 1500;i < 2000; i += 1)
+    {
+        testJSON.RemoveValue("num" $ string(i));
+    }
+    allValuesCorrect = true;
+    for (i = 0;i < 200; i += 1)
+    {
+        if (i < 500)
+        {
+            correctValue = (    testJSON.GetString("num" $ string(i))
+                            ==  ("str" $ string(Sin(i))) );
+            Issue("Variables are incorrectly overwritten");
+        }
+        else if(i < 1500)
+        {
+            correctValue = (    testJSON.GetNumber("num" $ string(i))
+                            ==  4 * i*i - 2.6 * i + 0.75);
+            Issue("Variables are lost");
+        }
+        else
+        {
+            correctValue = (    testJSON.GetType("num" $ string(i))
+                            ==  JSON_Undefined);
+            Issue("Variables aren't removed");
+        }
+        if (!correctValue)
+        {
+            allValuesCorrect = false;
+            break;
+        }
+    }
+    TEST_ExpectTrue(allValuesCorrect);
+}
+
+protected static function SubTest_Object()
+{
+    local JSONObject testObject;
+    Context("Testing setters and getters for folded objects");
+    testObject = new class'JSONObject';
+    testObject.CreateObject("folded");
+    testObject.GetObject("folded").CreateObject("folded");
+    testObject.SetString("out", "string outside");
+    testObject.GetObject("folded").SetNumber("mid", 8);
+    testObject.GetObject("folded")
+        .GetObject("folded")
+        .SetString("in", "string inside");
+
+    Issue("Addressing variables in root object doesn't work");
+    TEST_ExpectTrue(testObject.GetString("out", "default") == "string outside");
+
+    Issue("Addressing variables in folded object doesn't work");
+    TEST_ExpectTrue(testObject.GetObject("folded").GetNumber("mid", 1) == 8);
+
+    Issue("Addressing plain variables in folded (twice) object doesn't work");
+    TEST_ExpectTrue(testObject.GetObject("folded").GetObject("folded")
+        .GetString("in", "default") == "string inside");
+}
+
+protected static function SubTest_ArrayUndefined()
+{
+    local JSONArray testJSON;
+    testJSON = new class'JSONArray';
+    Context("Testing how `JSONArray` handles undefined values");
+    Issue("Undefined variable doesn't have `JSON_Undefined` type");
+    TEST_ExpectTrue(testJSON.GetType(0) == JSON_Undefined);
+
+    Issue("There is a variable in an empty object after `GetType` call");
+    TEST_ExpectTrue(testJSON.GetType(0) == JSON_Undefined);
+
+    Issue("Negative index refers to a defined value");
+    TEST_ExpectTrue(testJSON.GetType(-1) == JSON_Undefined);
+
+    Issue("Getters don't return default values for undefined variables");
+    TEST_ExpectTrue(testJSON.GetNumber(0, 0) == 0);
+    TEST_ExpectTrue(testJSON.GetString(0, "") == "");
+    TEST_ExpectTrue(testJSON.GetBoolean(0, false) == false);
+    TEST_ExpectNone(testJSON.GetObject(0));
+    TEST_ExpectNone(testJSON.GetArray(0));
+
+    Issue(  "Getters don't return user-defined default values for" @
+            "undefined variables");
+    TEST_ExpectTrue(testJSON.GetNumber(0, 10) == 10);
+    TEST_ExpectTrue(testJSON.GetString(0, "test") == "test");
+    TEST_ExpectTrue(testJSON.GetBoolean(0, true) == true);
+}
+
+protected static function SubTest_ArrayBooleanGetSetRemove()
+{
+    local JSONArray testJSON;
+    testJSON = new class'JSONArray';
+    testJSON.SetBoolean(0, true);
+
+    Context("Testing `JSONArray`'s get/set/remove functions for" @
+            "boolean variables");
+    Issue("Boolean type isn't properly set by `SetBoolean`");
+    TEST_ExpectTrue(testJSON.GetType(0) == JSON_Boolean);
+
+    Issue("Value is incorrectly assigned by `SetBoolean`");
+    TEST_ExpectTrue(testJSON.GetBoolean(0) == true);
+    testJSON.SetBoolean(0, false);
+
+    Issue("Variable value isn't correctly reassigned by `SetBoolean`");
+    TEST_ExpectTrue(testJSON.GetBoolean(0) == false);
+
+    Issue(  "Getting boolean variable as a wrong type" @
+            "doesn't yield default value");
+    TEST_ExpectTrue(testJSON.GetNumber(0, 7) == 7);
+
+    Issue("Boolean variable isn't being properly removed");
+    testJSON.RemoveValue(0);
+    TEST_ExpectTrue( testJSON.GetType(0) == JSON_Undefined);
+
+    Issue(  "Getters don't return default value for missing key that" @
+            "previously stored boolean value, but got removed");
+    TEST_ExpectTrue(testJSON.GetBoolean(0, true) == true);
+}
+
+protected static function SubTest_ArrayStringGetSetRemove()
+{
+    local JSONArray testJSON;
+    testJSON = new class'JSONArray';
+    testJSON.SetString(0, "first string");
+
+    Context("Testing `JSONArray`'s get/set/remove functions for" @
+            "string variables");
+    Issue("String type isn't properly set by `SetString`");
+    TEST_ExpectTrue(testJSON.GetType(0) == JSON_String);
+
+    Issue("Value is incorrectly assigned by `SetString`");
+    TEST_ExpectTrue(testJSON.GetString(0) == "first string");
+
+    Issue(  "Providing default variable value makes 'GetString'" @
+            "return incorrect value");
+    TEST_ExpectTrue(testJSON.GetString(0, "alternative") == "first string");
+
+    Issue("Variable value isn't correctly reassigned by `SetString`");
+    testJSON.SetString(0, "new string!~");
+    TEST_ExpectTrue(testJSON.GetString(0) == "new string!~");
+
+    Issue(  "Getting string variable as a wrong type" @
+            "doesn't yield default value");
+    TEST_ExpectTrue(testJSON.GetBoolean(0, true) == true);
+
+    Issue("Boolean variable isn't being properly removed");
+    testJSON.RemoveValue(0);
+    TEST_ExpectTrue(testJSON.GetType(0) == JSON_Undefined);
+
+    Issue(  "Getters don't return default value for missing key that" @
+            "previously stored string value, but got removed");
+    TEST_ExpectTrue(testJSON.GetString(0, "other") == "other");
+}
+
+protected static function SubTest_ArrayNumberGetSetRemove()
+{
+    local JSONArray testJSON;
+    testJSON = new class'JSONArray';
+    testJSON.SetNumber(0, 3.5);
+
+    Context("Testing `JSONArray`'s get/set/remove functions for" @
+            "number variables");
+    Issue("Number type isn't properly set by `SetNumber`");
+    TEST_ExpectTrue(testJSON.GetType(0) == JSON_Number);
+
+    Issue("Value is incorrectly assigned by `SetNumber`");
+    TEST_ExpectTrue(testJSON.GetNumber(0) == 3.5);
+
+    Issue(  "Providing default variable value makes 'GetNumber'" @
+            "return incorrect value");
+    TEST_ExpectTrue(testJSON.GetNumber(0, 5) == 3.5);
+
+    Issue("Variable value isn't correctly reassigned by `SetNumber`");
+    testJSON.SetNumber(0, 7);
+    TEST_ExpectTrue(testJSON.GetNumber(0) == 7);
+
+    Issue(  "Getting number variable as a wrong type" @
+            "doesn't yield default value");
+    TEST_ExpectTrue(testJSON.GetString(0, "default") == "default");
+
+    Issue("Number type isn't being properly removed");
+    testJSON.RemoveValue(0);
+    TEST_ExpectTrue(testJSON.GetType(0) == JSON_Undefined);
+
+    Issue(  "Getters don't return default value for missing key that" @
+            "previously stored number value, but got removed");
+    TEST_ExpectTrue(testJSON.GetNumber(0, 13) == 13);
+}
+
+protected static function SubTest_ArrayNullGetSetRemove()
+{
+    local JSONArray testJSON;
+    testJSON = new class'JSONArray';
+
+    Context("Testing `JSONArray`'s get/set/remove functions for" @
+            "null values");
+    
+    Issue("Undefined variable is incorrectly considered `null`");
+    TEST_ExpectFalse(testJSON.IsNull(0));
+    TEST_ExpectFalse(testJSON.IsNull(2));
+    TEST_ExpectFalse(testJSON.IsNull(-1));
+
+    Issue("Number variable is incorrectly considered `null`");
+    testJSON.SetNumber(0, 4);
+    TEST_ExpectFalse(testJSON.IsNull(0));
+
+    Issue("Boolean variable is incorrectly considered `null`");
+    testJSON.SetBoolean(0, true);
+    TEST_ExpectFalse(testJSON.IsNull(0));
+    
+    Issue("String variable is incorrectly considered `null`");
+    testJSON.SetString(0, "string");
+    TEST_ExpectFalse(testJSON.IsNull(0));
+
+    Issue("Null value is incorrectly assigned");
+    testJSON.SetNull(0);
+    TEST_ExpectTrue(testJSON.IsNull(0));
+
+    Issue("Null type isn't properly set by `SetNumber`");
+    TEST_ExpectTrue(testJSON.GetType(0) == JSON_Null);
+
+    Issue("Null value isn't being properly removed");
+    testJSON.RemoveValue(0);
+    TEST_ExpectTrue(testJSON.GetType(0) == JSON_Undefined);
+}
+
+//  Returns following array:
+//  [10.0, "test string", "another string", true, 0.0, {"var": 7.0}]
+protected static function JSONArray Prepare_Array()
+{
+    local JSONArray testArray;
+    testArray = new class'JSONArray';
+    testArray.AddNumber(10.0f)
+        .AddString("test string")
+        .AddString("another string")
+        .AddBoolean(true)
+        .AddNumber(0.0f)
+        .AddObject();
+    testArray.GetObject(5).SetNumber("var", 7);
+    return testArray;
+}
+
+protected static function SubTest_ArrayMultipleVariablesStorage()
+{
+    local JSONArray testArray;
+    testArray = Prepare_Array();
+
+    Context("Testing how `JSONArray` handles adding and" @
+            "changing several variables");
+    Issue("Stored values are compromised.");
+    TEST_ExpectTrue(testArray.GetNumber(0) == 10.0f);
+    TEST_ExpectTrue(testArray.GetString(1) == "test string");
+    TEST_ExpectTrue(testArray.GetString(2) == "another string");
+    TEST_ExpectTrue(testArray.GetBoolean(3) == true);
+    TEST_ExpectTrue(testArray.GetNumber(4) == 0.0f);
+    TEST_ExpectTrue(testArray.GetObject(5).GetNumber("var") == 7);
+
+    Issue("Values incorrectly change their values.");
+    testArray.SetString(3, "new string");
+    TEST_ExpectTrue(testArray.GetString(3) == "new string");
+
+    Issue(  "After overwriting boolean value with a different type," @
+            "attempting go get it as a boolean gives old value," @
+            "instead of default");
+    TEST_ExpectTrue(testArray.GetBoolean(3, false) == false);
+
+    Issue("Type of the variable is incorrectly changed.");
+    TEST_ExpectTrue(testArray.GetType(3) == JSON_String);
+}
+
+protected static function SubTest_ArrayMultipleVariablesRemoval()
+{
+    local JSONArray testArray;
+    testArray = Prepare_Array();
+    //  Test removing variables
+    //  After `Prepare_Array`, our array should be:
+    //  [10.0, "test string", "another string", true, 0.0, {"var": 7.0}]
+
+    Context("Testing how `JSONArray` handles adding and" @
+            "removing several variables");
+    Issue("Values are incorrectly removed");
+    testArray.RemoveValue(2);
+    //  [10.0, "test string", true, 0.0, {"var": 7.0}]
+    Issue("Values are incorrectly removed");
+    TEST_ExpectTrue(testArray.GetNumber(0) == 10.0);
+    TEST_ExpectTrue(testArray.GetString(1) == "test string");
+    TEST_ExpectTrue(testArray.GetBoolean(2) == true);
+    TEST_ExpectTrue(testArray.GetNumber(3) == 0.0f);
+    TEST_ExpectTrue(testArray.GetType(4) == JSON_Object);
+
+    Issue("First element incorrectly removed");
+    testArray.RemoveValue(0);
+    //  ["test string", true, 0.0, {"var": 7.0}]
+    TEST_ExpectTrue(testArray.GetString(0) == "test string");
+    TEST_ExpectTrue(testArray.GetBoolean(1) == true);
+    TEST_ExpectTrue(testArray.GetNumber(2) == 0.0f);
+    TEST_ExpectTrue(testArray.GetType(3) == JSON_Object);
+    TEST_ExpectTrue(testArray.GetObject(3).GetNumber("var") == 7.0);
+
+    Issue("Last element incorrectly removed");
+    testArray.RemoveValue(3);
+    //  ["test string", true, 0.0]
+    TEST_ExpectTrue(testArray.GetLength() == 3);
+    TEST_ExpectTrue(testArray.GetString(0) == "test string");
+    TEST_ExpectTrue(testArray.GetBoolean(1) == true);
+    TEST_ExpectTrue(testArray.GetNumber(2) == 0.0f);
+
+    Issue("Removing all elements is handled incorrectly");
+    testArray.RemoveValue(0);
+    testArray.RemoveValue(0);
+    testArray.RemoveValue(0);
+    TEST_ExpectTrue(testArray.Getlength() == 0);
+    TEST_ExpectTrue(testArray.GetType(0) == JSON_Undefined);
+}
+
+protected static function SubTest_ArrayRemovingMultipleVariablesAtOnce()
+{
+    local JSONArray testArray;
+    testArray = new class'JSONArray';
+    testArray.AddNumber(10.0f)
+        .AddString("test string")
+        .AddString("another string")
+        .AddNumber(7.0);
+
+    Context("Testing how `JSONArray`' handles removing" @
+            "multiple elements at once");
+    Issue("Multiple values are incorrectly removed");
+    testArray.RemoveValue(1, 2);
+    TEST_ExpectTrue(testArray.GetLength() == 2);
+    TEST_ExpectTrue(testArray.GetNumber(1) == 7.0);
+
+    testArray.AddNumber(4.0f)
+        .AddString("test string")
+        .AddString("another string")
+        .AddNumber(8.0);
+
+    //  Current array:
+    //  [10.0, 7.0, 4.0, "test string", "another string", 8.0]
+    Issue("Last value is incorrectly removed");
+    testArray.RemoveValue(5, 1);
+    TEST_ExpectTrue(testArray.GetLength() == 5);
+    TEST_ExpectTrue(testArray.GetString(4) == "another string");
+
+    //  Current array:
+    //  [10.0, 7.0, 4.0, "test string", "another string"]
+    Issue("Tail elements are incorrectly removed");
+    testArray.RemoveValue(3, 4);
+    TEST_ExpectTrue(testArray.GetLength() == 3);
+    TEST_ExpectTrue(testArray.GetNumber(0) == 10.0);
+    TEST_ExpectTrue(testArray.GetNumber(2) == 4.0);
+
+    Issue("Array empties incorrectly");
+    testArray.RemoveValue(0, testArray.GetLength());
+    TEST_ExpectTrue(testArray.GetLength() == 0);
+    TEST_ExpectTrue(testArray.GetType(0) == JSON_Undefined);
+    TEST_ExpectTrue(testArray.GetType(1) == JSON_Undefined);
+}
+
+protected static function SubTest_ArrayExpansions()
+{
+    local JSONArray testArray;
+    testArray = new class'JSONArray';
+
+    Context("Testing how `JSONArray`' handles expansions/shrinking " @
+            "via `SetLength()`");
+    Issue("`SetLength()` doesn't properly expand empty array");
+    testArray.SetLength(2);
+    TEST_ExpectTrue(testArray.GetLength() == 2);
+    TEST_ExpectTrue(testArray.GetType(0) == JSON_Null);
+    TEST_ExpectTrue(testArray.GetType(1) == JSON_Null);
+
+    Issue("`SetLength()` doesn't properly expand non-empty array");
+    testArray.AddNumber(1);
+    testArray.SetLength(4);
+    TEST_ExpectTrue(testArray.GetLength() == 4);
+    TEST_ExpectTrue(testArray.GetType(0) == JSON_Null);
+    TEST_ExpectTrue(testArray.GetType(1) == JSON_Null);
+    TEST_ExpectTrue(testArray.GetType(2) == JSON_Number);
+    TEST_ExpectTrue(testArray.GetType(3) == JSON_Null);
+    TEST_ExpectTrue(testArray.GetNumber(2) == 1);
+    SubSubTest_ArraySetNumberExpansions();
+    SubSubTest_ArraySetStringExpansions();
+    SubSubTest_ArraySetBooleanExpansions();
+}
+
+protected static function SubSubTest_ArraySetNumberExpansions()
+{
+    local JSONArray testArray;
+    testArray = new class'JSONArray';
+
+    Context("Testing how `JSONArray`' handles expansions via" @
+            "`SetNumber()` function");
+    Issue("Setters don't create correct first element");
+    testArray.SetNumber(0, 1);
+    TEST_ExpectTrue(testArray.GetLength() == 1);
+    TEST_ExpectTrue(testArray.GetNumber(0) == 1);
+
+    Issue(  "`SetNumber()` doesn't properly define array when setting" @
+            "value out-of-bounds");
+    testArray = new class'JSONArray';
+    testArray.AddNumber(1);
+    testArray.SetNumber(4, 2);
+    TEST_ExpectTrue(testArray.GetLength() == 5);
+    TEST_ExpectTrue(testArray.GetNumber(0) == 1);
+    TEST_ExpectTrue(testArray.GetType(1) == JSON_Null);
+    TEST_ExpectTrue(testArray.GetType(2) == JSON_Null);
+    TEST_ExpectTrue(testArray.GetType(3) == JSON_Null);
+    TEST_ExpectTrue(testArray.GetNumber(4) == 2);
+
+    Issue("`SetNumber()` expands array even when it told not to");
+    testArray.SetNumber(6, 7, true);
+    TEST_ExpectTrue(testArray.GetLength() == 5);
+    TEST_ExpectTrue(testArray.GetNumber(6) == 0);
+    TEST_ExpectTrue(testArray.GetType(5) == JSON_Undefined);
+    TEST_ExpectTrue(testArray.GetType(6) == JSON_Undefined);
+}
+
+protected static function SubSubTest_ArraySetStringExpansions()
+{
+    local JSONArray testArray;
+    testArray = new class'JSONArray';
+
+    Context("Testing how `JSONArray`' handles expansions via" @
+            "`SetString()` function");
+    Issue("Setters don't create correct first element");
+    testArray.SetString(0, "str");
+    TEST_ExpectTrue(testArray.GetLength() == 1);
+    TEST_ExpectTrue(testArray.GetString(0) == "str");
+
+    Issue(  "`SetString()` doesn't properly define array when setting" @
+            "value out-of-bounds");
+    testArray = new class'JSONArray';
+    testArray.AddString("str");
+    testArray.SetString(4, "str2");
+    TEST_ExpectTrue(testArray.GetLength() == 5);
+    TEST_ExpectTrue(testArray.GetString(0) == "str");
+    TEST_ExpectTrue(testArray.GetType(1) == JSON_Null);
+    TEST_ExpectTrue(testArray.GetType(2) == JSON_Null);
+    TEST_ExpectTrue(testArray.GetType(3) == JSON_Null);
+    TEST_ExpectTrue(testArray.GetString(4) == "str2");
+
+    Issue("`SetString()` expands array even when it told not to");
+    testArray.SetString(6, "new string", true);
+    TEST_ExpectTrue(testArray.GetLength() == 5);
+    TEST_ExpectTrue(testArray.GetString(6) == "");
+    TEST_ExpectTrue(testArray.GetType(5) == JSON_Undefined);
+    TEST_ExpectTrue(testArray.GetType(6) == JSON_Undefined);
+}
+
+protected static function SubSubTest_ArraySetBooleanExpansions()
+{
+    local JSONArray testArray;
+    testArray = new class'JSONArray';
+
+    Context("Testing how `JSONArray`' handles expansions via" @
+            "`SetBoolean()` function");
+    Issue("Setters don't create correct first element");
+    testArray.SetBoolean(0, false);
+    TEST_ExpectTrue(testArray.GetLength() == 1);
+    TEST_ExpectTrue(testArray.GetBoolean(0) == false);
+
+    Issue(  "`SetBoolean()` doesn't properly define array when setting" @
+            "value out-of-bounds");
+    testArray = new class'JSONArray';
+    testArray.AddBoolean(true);
+    testArray.SetBoolean(4, true);
+    TEST_ExpectTrue(testArray.GetLength() == 5);
+    TEST_ExpectTrue(testArray.GetBoolean(0) == true);
+    TEST_ExpectTrue(testArray.GetType(1) == JSON_Null);
+    TEST_ExpectTrue(testArray.GetType(2) == JSON_Null);
+    TEST_ExpectTrue(testArray.GetType(3) == JSON_Null);
+    TEST_ExpectTrue(testArray.GetBoolean(4) == true);
+
+    Issue("`SetBoolean()` expands array even when it told not to");
+    testArray.SetBoolean(6, true, true);
+    TEST_ExpectTrue(testArray.GetLength() == 5);
+    TEST_ExpectTrue(testArray.GetBoolean(6) == false);
+    TEST_ExpectTrue(testArray.GetType(5) == JSON_Undefined);
+    TEST_ExpectTrue(testArray.GetType(6) == JSON_Undefined);
+}
+
+defaultproperties
+{
+    caseName = "JSON"
+}
\ No newline at end of file
diff --git a/sources/Manifest.uc b/sources/Manifest.uc
index 26b21ca..571093e 100644
--- a/sources/Manifest.uc
+++ b/sources/Manifest.uc
@@ -44,4 +44,6 @@ defaultproperties
     features(7) = class'FixInventoryAbuse'
     //  Listeners
     requiredListeners(0) = class'MutatorListener_Connection'
+    //  Unit tests
+    testCases(0) = class'TEST_JSON'
 }
\ No newline at end of file