Add notifications.

build.zig

@@ -150,7 +150,7 @@ pub fn build(b: *std.Build) void {
     paths_tests.root_module.addImport("glib", gobject.module("glib2"));
     test_step.dependOn(&b.addRunArtifact(paths_tests).step);
 
-    // The palette is the third root: a table of colours, the rules for
+    // The palette is the third root: a table of colors, the rules for
     // resolving one, and the CSS it is written out as. It reaches libghostty-vt
     // for the terminal's own default palette and nothing else, so it tests
     // without a display in the same way the two above do.
@@ -225,6 +225,23 @@ pub fn build(b: *std.Build) void {
     });
     test_step.dependOn(&b.addRunArtifact(store_tests).step);
 
+    // The mute rules are their own root. Whether a tab is silent at this instant,
+    // and what its row menu says about that, is arithmetic on a deadline — and
+    // it is the half of notifications that can be wrong without anyone noticing,
+    // since the symptom is a popup that didn't arrive. It reaches gio to hand a
+    // notification to the session, which is the part these tests leave alone.
+    const notify_tests = b.addTest(.{
+        .root_module = b.createModule(.{
+            .root_source_file = b.path("src/notify.zig"),
+            .target = target,
+            .optimize = optimize,
+            .link_libc = true,
+        }),
+    });
+    notify_tests.root_module.addImport("gio", gobject.module("gio2"));
+    notify_tests.root_module.addImport("glib", gobject.module("glib2"));
+    test_step.dependOn(&b.addRunArtifact(notify_tests).step);
+
     const emoji_tests = b.addTest(.{
         .root_module = b.createModule(.{
             .root_source_file = b.path("src/emoji.zig"),