diff --git a/Base/usr/share/man/man1/js.md b/Base/usr/share/man/man1/js.md
index 7579f11bed..68332f7454 100644
--- a/Base/usr/share/man/man1/js.md
+++ b/Base/usr/share/man/man1/js.md
@@ -25,7 +25,6 @@ Run `help()` in REPL mode to see its available built-in functions.
 * `-l`, `--print-last-result`: Print the result of the last statement executed.
 * `-g`, `--gc-on-every-allocation`: Run garbage collection on every allocation.
 * `-s`, `--no-syntax-highlight`: Disable live syntax highlighting in the REPL
-* `-t`, `--test-mode`: Run the interpreter with added functionality for the test harness
 
 ## Examples
 
@@ -47,26 +46,3 @@ undefined
 77
 undefined
 ```
-
-## Test mode
-
-In test mode, the `load()` function is added to the global object and can be used
-to load further test utility functions defined in `LibJS/Tests/test-common.js`.
-
-Typically a test will look like this:
-
-```js
-load("test-common.js");
-
-try {
-    // test feature
-    console.log("PASS");
-} catch (e) {
-    console.log("FAIL: " + e);
-}
-```
-
-Available functions in `test-common.js`:
-
-* `assert(expression)`: Throws an `AssertionError` if condition does not evaluate to a truthy value
-* `assertNotReached()`: Throws an `AssertionError`, use to ensure certain code paths are never reached
diff --git a/Userland/js.cpp b/Userland/js.cpp
index e37b8c8d6e..d18354bb4f 100644
--- a/Userland/js.cpp
+++ b/Userland/js.cpp
@@ -55,14 +55,12 @@ public:
     virtual void initialize() override;
     virtual ~ReplObject() override;
 
-    JS_DECLARE_NATIVE_FUNCTION(load_file);
-    JS_DECLARE_NATIVE_FUNCTION(is_strict_mode);
-
 private:
     virtual const char* class_name() const override { return "ReplObject"; }
 
     JS_DECLARE_NATIVE_FUNCTION(exit_interpreter);
     JS_DECLARE_NATIVE_FUNCTION(repl_help);
+    JS_DECLARE_NATIVE_FUNCTION(load_file);
     JS_DECLARE_NATIVE_FUNCTION(save_to_file);
 };
 
@@ -441,11 +439,6 @@ JS_DEFINE_NATIVE_FUNCTION(ReplObject::load_file)
     return JS::Value(true);
 }
 
-JS_DEFINE_NATIVE_FUNCTION(ReplObject::is_strict_mode)
-{
-    return JS::Value(interpreter.in_strict_mode());
-}
-
 void repl(JS::Interpreter& interpreter)
 {
     while (!s_fail_repl) {
@@ -457,12 +450,6 @@ void repl(JS::Interpreter& interpreter)
     }
 }
 
-void enable_test_mode(JS::Interpreter& interpreter)
-{
-    interpreter.global_object().define_native_function("load", ReplObject::load_file);
-    interpreter.global_object().define_native_function("isStrictMode", ReplObject::is_strict_mode);
-}
-
 static Function<void()> interrupt_interpreter;
 void sigint_handler()
 {
@@ -549,7 +536,6 @@ int main(int argc, char** argv)
 {
     bool gc_on_every_allocation = false;
     bool disable_syntax_highlight = false;
-    bool test_mode = false;
     const char* script_path = nullptr;
 
     Core::ArgsParser args_parser;
@@ -557,7 +543,6 @@ int main(int argc, char** argv)
     args_parser.add_option(s_print_last_result, "Print last result", "print-last-result", 'l');
     args_parser.add_option(gc_on_every_allocation, "GC on every allocation", "gc-on-every-allocation", 'g');
     args_parser.add_option(disable_syntax_highlight, "Disable live syntax highlighting", "no-syntax-highlight", 's');
-    args_parser.add_option(test_mode, "Run the interpreter with added functionality for the test harness", "test-mode", 't');
     args_parser.add_positional_argument(script_path, "Path to script file", "script", Core::ArgsParser::Required::No);
     args_parser.parse(argc, argv);
 
@@ -577,8 +562,6 @@ int main(int argc, char** argv)
         interpreter->console().set_client(console_client);
         interpreter->heap().set_should_collect_on_every_allocation(gc_on_every_allocation);
         interpreter->set_underscore_is_last_value(true);
-        if (test_mode)
-            enable_test_mode(*interpreter);
 
         s_editor = Line::Editor::construct();
 
@@ -861,8 +844,6 @@ int main(int argc, char** argv)
         ReplConsoleClient console_client(interpreter->console());
         interpreter->console().set_client(console_client);
         interpreter->heap().set_should_collect_on_every_allocation(gc_on_every_allocation);
-        if (test_mode)
-            enable_test_mode(*interpreter);
 
         signal(SIGINT, [](int) {
             sigint_handler();