feat(term): implement "key_pressed" signal

Also adds tests for write response as code relating to this was
modified.

test/test_rendering.gd

@@ -17,6 +17,7 @@ func before_each():
 	terminal = Terminal.new()
 	terminal.add_theme_font_override("normal_font", preload("res://themes/fonts/regular.tres"))
 	terminal.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
+	watch_signals(terminal)
 	call_deferred("add_child_autofree", terminal)
 	await wait_for_signal(terminal.ready, 5)
 
@@ -33,3 +34,57 @@ class TestRendering:
 		await wait_frames(15)
 		var cell_color = pick_cell_color(Vector2i(0, 0))
 		assert_eq(cell_color, Color.RED)
+
+
+class TestKeyPressed:
+	extends RenderingTest
+
+	var input_event: InputEventKey
+
+	func before_each():
+		await super.before_each()
+
+		terminal.grab_focus()
+
+		input_event = InputEventKey.new()
+		input_event.pressed = true
+		Input.call_deferred("parse_input_event", input_event)
+
+	func test_key_pressed_emitted_on_key_input():
+		input_event.keycode = KEY_A
+		input_event.unicode = "a".unicode_at(0)
+
+		await wait_for_signal(terminal.key_pressed, 1)
+		assert_signal_emitted(terminal, "key_pressed")
+
+	func test_key_pressed_emits_interpreted_key_input_as_first_param():
+		input_event.keycode = KEY_UP
+		input_event.unicode = 0
+
+		await wait_for_signal(terminal.key_pressed, 1)
+
+		var signal_parameters = get_signal_parameters(terminal, "key_pressed", 0)
+		assert_eq(signal_parameters[0], "\u001b[A")
+
+	func test_key_pressed_emits_original_input_event_as_second_param():
+		input_event.keycode = KEY_L
+		input_event.unicode = "l".unicode_at(0)
+
+		await wait_for_signal(terminal.key_pressed, 1)
+
+		var signal_parameters = get_signal_parameters(terminal, "key_pressed", 0)
+		assert_eq(signal_parameters[1], input_event)
+
+	func test_key_pressed_not_emitted_when_writing_to_terminal():
+		terminal.write("a")
+		await wait_frames(1)
+		assert_signal_emit_count(terminal, "key_pressed", 0)
+
+	func test_key_pressed_not_emitted_by_other_input_type():
+		var mouse_input = InputEventMouseButton.new()
+		mouse_input.button_index = MOUSE_BUTTON_LEFT
+		mouse_input.pressed = true
+		Input.call_deferred("parse_input_event", mouse_input)
+
+		await wait_for_signal(terminal.gui_input, 1)
+		assert_signal_emit_count(terminal, "key_pressed", 0)

test/test_terminal.gd

@@ -60,3 +60,19 @@ class TestCursorPos:
 	func test_get_cursor_pos_y():
 		terminal.write("_".repeat(terminal.cols + 1))
 		assert_eq(terminal.get_cursor_pos().y, 1)
+
+
+class TestWrite:
+	extends TerminalTest
+
+	func test_returns_response_when_input_contains_query():
+		var response = terminal.write("\u001b[6n")  # Query cursor position.
+		assert_eq(response, "\u001b[1;1R")
+
+	func test_returns_response_to_multiple_queries():
+		var response = terminal.write("\u001b[6n\u001b[5n")  # Query cursor position and status.
+		assert_eq(response, "\u001b[1;1R\u001b[0n")
+
+	func test_returns_response_to_multiple_queries_among_other_data():
+		var response = terminal.write("hello\r\nworld\u001b[6nother\r\ndata\u001b[5ntest")
+		assert_eq(response, "\u001b[2;6R\u001b[0n")