feat: configure cursor appearance by editing mode

tests/unit/ruby.rs

@@ -653,6 +653,69 @@ fn git_gutter_config_modes_default_and_rejection() {
     }
 }
 
+#[test]
+fn cursor_config_partial_shapes_and_invalid_options() {
+    use crate::cursor::CursorShape::{Bar, Block, Underline};
+
+    let fixture = Fixture::new();
+    for (options, mode_colors, shapes) in [
+        (
+            r#"{ insert: :bar, "visual" => "underline" }"#,
+            true,
+            [Block, Bar, Block, Block, Underline],
+        ),
+        (
+            r#"{ mode_colors: false, normal: "bar", insert: :underline, command: :bar, search: "underline", visual: :block }"#,
+            false,
+            [Bar, Underline, Bar, Underline, Block],
+        ),
+        (
+            r#"{ "mode_colors" => true, normal: :underline, insert: "block", command: "underline", search: :bar, visual: "bar" }"#,
+            true,
+            [Underline, Block, Underline, Bar, Bar],
+        ),
+    ] {
+        let path = fixture.file(
+            "config.rb",
+            &format!("Vamp.configure {{ |config| config.cursor = {options} }}"),
+        );
+        let cursor = load_config(&path).unwrap().cursor;
+        assert_eq!(cursor.mode_colors, mode_colors);
+        assert_eq!(
+            [
+                cursor.normal,
+                cursor.insert,
+                cursor.command,
+                cursor.search,
+                cursor.visual
+            ],
+            shapes
+        );
+    }
+    for options in [
+        "nil",
+        "false",
+        "[]",
+        "{ mode_colors: nil }",
+        "{ mode_colors: 1 }",
+        r#"{ mode_colors: "true" }"#,
+        "{ insert: nil }",
+        "{ insert: false }",
+        "{ insert: 1 }",
+        "{ insert: :beam }",
+        r#"{ normal: "" }"#,
+        "{ unknown: :block }",
+        "{ 1 => :block }",
+        r#"{ insert: :bar, "insert" => :block }"#,
+    ] {
+        let path = fixture.file(
+            "config.rb",
+            &format!("Vamp.configure {{ |config| config.cursor = {options} }}"),
+        );
+        assert!(load_config(&path).is_err(), "{options}");
+    }
+}
+
 #[test]
 fn git_blame_boolean_config_typed_toggle_palette_and_wire_validation() {
     let fixture = Fixture::new();