test(tui): add tests for diff viewer in tui

crates/but/src/command/legacy/status/tui/tests/details_tests.rs

@@ -0,0 +1,188 @@
+use but_testsupport::Sandbox;
+use crossterm::event::{KeyCode, KeyModifiers};
+use snapbox::file;
+use temp_env::with_var;
+
+use crate::command::legacy::status::tui::tests::utils::{test_tui, test_tui_with_size};
+
+#[test]
+fn toggle_details_view_for_commit() {
+    let env = Sandbox::init_scenario_with_target_and_default_settings("one-stack").unwrap();
+    env.setup_metadata(&["A"]).unwrap();
+
+    let mut tui = test_tui(env);
+
+    tui.input_then_render([KeyCode::Down, KeyCode::Down])
+        .assert_rendered_term_svg_eq(file!["snapshots/toggle_details_view_for_commit_001.svg"]);
+
+    tui.input_then_render('d')
+        .assert_rendered_term_svg_eq(file!["snapshots/toggle_details_view_for_commit_002.svg"]);
+
+    tui.input_then_render('d')
+        .assert_rendered_term_svg_eq(file!["snapshots/toggle_details_view_for_commit_003.svg"]);
+}
+
+#[test]
+fn details_view_updates_with_selection_changes() {
+    let env = Sandbox::init_scenario_with_target_and_default_settings("two-stacks").unwrap();
+    env.setup_metadata(&["A", "B"]).unwrap();
+
+    let mut tui = test_tui(env);
+
+    tui.input_then_render('d')
+        .assert_rendered_term_svg_eq(file![
+            "snapshots/details_view_updates_with_selection_changes_001.svg"
+        ]);
+
+    tui.input_then_render([KeyCode::Down, KeyCode::Down])
+        .assert_rendered_term_svg_eq(file![
+            "snapshots/details_view_updates_with_selection_changes_002.svg"
+        ]);
+
+    tui.input_then_render((KeyModifiers::SHIFT, KeyCode::Char('J')))
+        .assert_rendered_term_svg_eq(file![
+            "snapshots/details_view_updates_with_selection_changes_003.svg"
+        ]);
+}
+
+#[test]
+fn details_view_supports_scroll_controls() {
+    let env = Sandbox::init_scenario_with_target_and_default_settings("one-stack").unwrap();
+    env.setup_metadata(&["A"]).unwrap();
+
+    let file_contents = (1..=120)
+        .map(|line| format!("line-{line:03}\n"))
+        .collect::<String>();
+    env.file("large.txt", file_contents);
+
+    let mut tui = test_tui_with_size(env, 100, 10);
+
+    tui.input_then_render('d')
+        .assert_rendered_term_svg_eq(file![
+            "snapshots/details_view_supports_scroll_controls_001.svg"
+        ]);
+
+    tui.render_with_messages((KeyModifiers::CONTROL, KeyCode::Char('n')), Vec::new())
+        .assert_rendered_term_svg_eq(file![
+            "snapshots/details_view_supports_scroll_controls_002.svg"
+        ]);
+
+    tui.render_with_messages((KeyModifiers::CONTROL, KeyCode::Char('d')), Vec::new())
+        .assert_rendered_term_svg_eq(file![
+            "snapshots/details_view_supports_scroll_controls_003.svg"
+        ]);
+
+    tui.render_with_messages((KeyModifiers::CONTROL, KeyCode::Char('u')), Vec::new())
+        .assert_rendered_term_svg_eq(file![
+            "snapshots/details_view_supports_scroll_controls_004.svg"
+        ]);
+
+    tui.render_with_messages((KeyModifiers::CONTROL, KeyCode::Char('p')), Vec::new())
+        .assert_rendered_term_svg_eq(file![
+            "snapshots/details_view_supports_scroll_controls_005.svg"
+        ]);
+}
+
+#[test]
+fn commit_message_wraps_in_details_view() {
+    let env = Sandbox::init_scenario_with_target_and_default_settings("one-stack").unwrap();
+    env.setup_metadata(&["A"]).unwrap();
+
+    let mut tui = test_tui_with_size(env, 80, 14);
+
+    tui.input_then_render([KeyCode::Down, KeyCode::Down])
+        .assert_rendered_term_svg_eq(file![
+            "snapshots/commit_message_wraps_in_details_view_001.svg"
+        ]);
+
+    tui.input_then_render(KeyCode::Enter)
+        .assert_rendered_term_svg_eq(file![
+            "snapshots/commit_message_wraps_in_details_view_002.svg"
+        ]);
+
+    tui.input_then_render(" this commit message is intentionally long so the details pane has to wrap the text across multiple visual lines")
+        .assert_rendered_term_svg_eq(file!["snapshots/commit_message_wraps_in_details_view_003.svg"]);
+
+    with_var("GIT_AUTHOR_DATE", Some("2000-01-01T00:00:00Z"), || {
+        with_var("GIT_COMMITTER_DATE", Some("2000-01-01T00:00:00Z"), || {
+            tui.input_then_render(KeyCode::Enter);
+        });
+    });
+
+    tui.input_then_render('d');
+
+    tui.render_with_messages((KeyModifiers::CONTROL, KeyCode::Char('n')), Vec::new())
+        .assert_rendered_term_svg_eq(file![
+            "snapshots/commit_message_wraps_in_details_view_005.svg"
+        ]);
+}
+
+#[test]
+fn details_view_renders_multiple_hunks_and_files() {
+    let env = Sandbox::init_scenario_with_target_and_default_settings("one-stack").unwrap();
+    env.setup_metadata(&["A"]).unwrap();
+
+    let first_file = (1..=8)
+        .map(|line| format!("alpha-{line}\n"))
+        .collect::<String>();
+    let second_file = (1..=8)
+        .map(|line| format!("beta-{line}\n"))
+        .collect::<String>();
+
+    env.file("alpha.txt", first_file);
+    env.file("beta.txt", second_file);
+
+    let mut tui = test_tui_with_size(env, 100, 18);
+
+    tui.input_then_render('d')
+        .assert_rendered_term_svg_eq(file![
+            "snapshots/details_view_renders_multiple_hunks_and_files_001.svg"
+        ]);
+}
+
+#[test]
+fn details_diff_svg_shows_plus_and_minus_backgrounds() {
+    let env = Sandbox::init_scenario_with_target_and_default_settings("one-stack").unwrap();
+    env.setup_metadata(&["A"]).unwrap();
+
+    env.file("A", "A-changed\n");
+
+    let mut tui = test_tui_with_size(env, 100, 12);
+
+    tui.input_then_render('d')
+        .assert_rendered_term_svg_eq(file![
+            "snapshots/details_diff_svg_shows_plus_and_minus_backgrounds_001.svg"
+        ]);
+}
+
+#[test]
+fn toggling_details_off_and_on_resets_scroll_position() {
+    let env = Sandbox::init_scenario_with_target_and_default_settings("one-stack").unwrap();
+    env.setup_metadata(&["A"]).unwrap();
+    let file_contents = (1..=80)
+        .map(|line| format!("line-{line:03}\n"))
+        .collect::<String>();
+    env.file("large.txt", file_contents);
+
+    let mut tui = test_tui_with_size(env, 100, 10);
+
+    tui.input_then_render('d')
+        .assert_rendered_term_svg_eq(file![
+            "snapshots/toggling_details_off_and_on_resets_scroll_position_001.svg"
+        ]);
+
+    tui.input_then_render((KeyModifiers::CONTROL, KeyCode::Char('d')))
+        .assert_rendered_term_svg_eq(file![
+            "snapshots/toggling_details_off_and_on_resets_scroll_position_002.svg"
+        ]);
+
+    tui.input_then_render('d')
+        .assert_rendered_term_svg_eq(file![
+            "snapshots/toggling_details_off_and_on_resets_scroll_position_003.svg"
+        ]);
+
+    tui.input_then_render('d')
+        .assert_rendered_term_svg_eq(file![
+            "snapshots/toggling_details_off_and_on_resets_scroll_position_004.svg"
+        ]);
+}

crates/but/src/command/legacy/status/tui/tests/mod.rs

@@ -12,6 +12,7 @@ use crate::command::legacy::status::tui::tests::utils::{test_tui, test_tui_with_
 mod branch_tests;
 mod command_tests;
 mod commit_tests;
+mod details_tests;
 mod move_tests;
 mod rub_tests;
 mod utils;