Add visual TUI test coverage

tests/style_snapshots.rs

@@ -0,0 +1,81 @@
+// Focused style snapshot tests.
+
+mod helpers;
+
+use helpers::app_builder::TestAppBuilder;
+use helpers::snapshot_utils::{buffer_to_style_snapshot, render_to_buffer};
+use helpers::test_data::{TestChatBuilder, TestMessageBuilder};
+use insta::assert_snapshot;
+
+#[test]
+fn snapshot_style_selected_chat() {
+    let chats = vec![
+        TestChatBuilder::new("Mom", 101).build(),
+        TestChatBuilder::new("Work Group", 102).build(),
+        TestChatBuilder::new("Boss", 103).build(),
+    ];
+    let mut app = TestAppBuilder::new().with_chats(chats).build();
+    app.chat_list_state.select(Some(1));
+
+    let buffer = render_to_buffer(36, 12, |f| {
+        tele_tui::ui::chat_list::render(f, f.area(), &mut app);
+    });
+
+    assert_snapshot!("style_selected_chat", buffer_to_style_snapshot(&buffer));
+}
+
+#[test]
+fn snapshot_style_selected_message() {
+    let chat = TestChatBuilder::new("Mom", 101).build();
+    let messages = vec![
+        TestMessageBuilder::new("First message", 201)
+            .sender("Mom")
+            .build(),
+        TestMessageBuilder::new("Selected message", 202)
+            .sender("Mom")
+            .build(),
+    ];
+    let mut app = TestAppBuilder::new()
+        .with_chat(chat)
+        .selected_chat(101)
+        .with_messages(101, messages)
+        .selecting_message(1)
+        .build();
+
+    let buffer = render_to_buffer(70, 18, |f| {
+        tele_tui::ui::messages::render(f, f.area(), &mut app);
+    });
+
+    assert_snapshot!("style_selected_message", buffer_to_style_snapshot(&buffer));
+}
+
+#[test]
+fn snapshot_style_reaction_picker_selection() {
+    let chat = TestChatBuilder::new("Mom", 101).build();
+    let message = TestMessageBuilder::new("React to this", 201)
+        .sender("Mom")
+        .build();
+    let mut app = TestAppBuilder::new()
+        .with_chat(chat)
+        .selected_chat(101)
+        .with_message(101, message)
+        .reaction_picker(
+            201,
+            vec![
+                "👍".to_string(),
+                "❤️".to_string(),
+                "😂".to_string(),
+                "🔥".to_string(),
+            ],
+        )
+        .build();
+    if let tele_tui::app::ChatState::ReactionPicker { selected_index, .. } = &mut app.chat_state {
+        *selected_index = 2;
+    }
+
+    let buffer = render_to_buffer(70, 18, |f| {
+        tele_tui::ui::messages::render(f, f.area(), &mut app);
+    });
+
+    assert_snapshot!("style_reaction_picker_selection", buffer_to_style_snapshot(&buffer));
+}