Add tests for setup shell integration features

Author: liby

src/termio/shell_integration.zig

@@ -147,6 +147,37 @@ pub fn setup_features(
     if (!features.title) try env.put("GHOSTTY_SHELL_INTEGRATION_NO_TITLE", "1");
 }
 
+test "setup_features" {
+    const testing = std.testing;
+
+    var arena = ArenaAllocator.init(testing.allocator);
+    defer arena.deinit();
+    const alloc = arena.allocator();
+
+    var env = EnvMap.init(alloc);
+    defer env.deinit();
+
+    // Test: all features enabled (no environment variables should be set)
+    try setup_features(&env, .{ .cursor = true, .sudo = true, .title = true });
+    try testing.expect(env.get("GHOSTTY_SHELL_INTEGRATION_NO_CURSOR") == null);
+    try testing.expect(env.get("GHOSTTY_SHELL_INTEGRATION_NO_SUDO") == null);
+    try testing.expect(env.get("GHOSTTY_SHELL_INTEGRATION_NO_TITLE") == null);
+
+    // Test: all features disabled
+    try setup_features(&env, .{ .cursor = false, .sudo = false, .title = false });
+    try testing.expectEqualStrings("1", env.get("GHOSTTY_SHELL_INTEGRATION_NO_CURSOR").?);
+    try testing.expectEqualStrings("1", env.get("GHOSTTY_SHELL_INTEGRATION_NO_SUDO").?);
+    try testing.expectEqualStrings("1", env.get("GHOSTTY_SHELL_INTEGRATION_NO_TITLE").?);
+
+    // Test: mixed features
+    env.deinit();
+    env = EnvMap.init(alloc);
+    try setup_features(&env, .{ .cursor = false, .sudo = true, .title = false });
+    try testing.expectEqualStrings("1", env.get("GHOSTTY_SHELL_INTEGRATION_NO_CURSOR").?);
+    try testing.expect(env.get("GHOSTTY_SHELL_INTEGRATION_NO_SUDO") == null);
+    try testing.expectEqualStrings("1", env.get("GHOSTTY_SHELL_INTEGRATION_NO_TITLE").?);
+}
+
 /// Setup the bash automatic shell integration. This works by
 /// starting bash in POSIX mode and using the ENV environment
 /// variable to load our bash integration script. This prevents