test: add test case

Signed-off-by: Snehil Shah <snehilshah.989@gmail.com>

lib/node_modules/@stdlib/repl/test/integration/test.completer_engine.js

@@ -194,7 +194,6 @@ tape( 'a REPL instance supports hiding the completions panel upon pressing TAB a
 			t.fail( error.message );
 			return;
 		}
-
 		// Check if the completions were cleared:
 		t.strictEqual( data[ data.length - 2 ], '\x1B[0J', 'returns expected value' );
 
@@ -204,6 +203,58 @@ tape( 'a REPL instance supports hiding the completions panel upon pressing TAB a
 	}
 });
 
+tape( 'a REPL instance supports hiding the completions panel upon typing again', function test( t ) {
+	var istream;
+	var opts;
+	var r;
+
+	istream = new DebugStream({
+		'name': 'repl-input-stream'
+	});
+	opts = {
+		'input': istream,
+		'settings': defaultSettings(),
+		'tty': {
+			'rows': 100,
+			'columns': 80
+		}
+	};
+	r = repl( opts, onClose );
+
+	// Declare variables with unique names in order to prevent namespace collisions:
+	istream.write( 'var zzzxy = 1;' );
+	istream.write( 'var zzzab = 2;' );
+
+	// Write the common substring of the variable names in order to generate completions:
+	istream.write( 'zzz' );
+
+	// Write TAB to display completions:
+	istream.write( '\t' );
+
+	// Write TAB again to hide completions:
+	istream.write( 'a' );
+
+	// Close the input stream:
+	istream.end();
+
+	// Close the REPL:
+	r.close();
+
+	function onClose( error, data ) {
+		if ( error ) {
+			t.fail( error.message );
+			return;
+		}
+		// Check if the completions were cleared:
+		t.strictEqual( data[ data.length - 3 ], '\x1B[0J', 'returns expected value' );
+		t.strictEqual( data[ data.length - 1 ], 'a', 'returns expected value' );
+
+		// NOTE: `data[ data.length-2 ]` adds the remaining string to the right of the cursor because of the abnormal behaviour of `clearScreenDown`...
+
+		t.end();
+	}
+});
+
 tape( 'a REPL instance supports navigating the TAB completions using arrow keys', function test( t ) {
 	var istream;
 	var opts;