Vendor dependencies

Let's see how I like this workflow.

vendor/tui/tests/widgets_canvas.rs

@@ -0,0 +1,42 @@
+use tui::{
+    backend::TestBackend,
+    buffer::Buffer,
+    style::{Color, Style},
+    text::Span,
+    widgets::canvas::Canvas,
+    Terminal,
+};
+
+#[test]
+fn widgets_canvas_draw_labels() {
+    let backend = TestBackend::new(5, 5);
+    let mut terminal = Terminal::new(backend).unwrap();
+    terminal
+        .draw(|f| {
+            let label = String::from("test");
+            let canvas = Canvas::default()
+                .background_color(Color::Yellow)
+                .x_bounds([0.0, 5.0])
+                .y_bounds([0.0, 5.0])
+                .paint(|ctx| {
+                    ctx.print(
+                        0.0,
+                        0.0,
+                        Span::styled(label.clone(), Style::default().fg(Color::Blue)),
+                    );
+                });
+            f.render_widget(canvas, f.size());
+        })
+        .unwrap();
+
+    let mut expected = Buffer::with_lines(vec!["    ", "    ", "     ", "     ", "test "]);
+    for row in 0..5 {
+        for col in 0..5 {
+            expected.get_mut(col, row).set_bg(Color::Yellow);
+        }
+    }
+    for col in 0..4 {
+        expected.get_mut(col, 4).set_fg(Color::Blue);
+    }
+    terminal.backend().assert_buffer(&expected)
+}