diff --git a/build/app.zig b/build/app.zig
index a32d14856..87cbd8d30 100644
--- a/build/app.zig
+++ b/build/app.zig
@@ -1191,6 +1191,22 @@ fn addTests(
             .filters = test_filters,
         }));
     }
+    const tour_tests = b.addTest(.{
+        .name = "fizzy-tour-tests",
+        .root_module = b.createModule(.{
+            .target = target,
+            .optimize = optimize,
+            .root_source_file = b.path("src/editor/demos/tour.zig"),
+        }),
+        .filters = test_filters,
+    });
+    tour_tests.root_module.addImport("tape", b.createModule(.{
+        .target = target,
+        .optimize = optimize,
+        .root_source_file = b.path("sdk/tape/root.zig"),
+    }));
+    try unit_test_artifacts.append(b.allocator, tour_tests);
+
     // The backend package's std-only tests (window layout, the title-bar hit test, the blur
     // region, the viewport map, the health counters), from its own list, so `zig build test`
     // here still runs them.
diff --git a/sdk/tape/Script.zig b/sdk/tape/Script.zig
index 0a82b0f96..83cc4efa5 100644
--- a/sdk/tape/Script.zig
+++ b/sdk/tape/Script.zig
@@ -427,6 +427,21 @@ pub fn commandWith(self: *Script, id: []const u8, args: anytype) !void {
 
 const testing = std.testing;
 
+test "a lacked name is left out of the script and an offered name stays" {
+    var s: Script = .init(testing.allocator, "t", "T");
+    try s.keyframe(.{ .root = "demo://t" });
+    try testing.expect(!s.lacksName("missing"));
+    s.lacks = &.{"missing"};
+    for ([_][]const u8{ "missing", "offered" }) |name| {
+        if (s.lacksName(name)) continue;
+        try s.command(name);
+    }
+    var owned = try s.finish();
+    defer owned.deinit();
+    try testing.expectEqual(@as(usize, 3), owned.tape.ops.len);
+    try testing.expectEqualStrings("offered", owned.tape.ops[2].do.command.id);
+}
+
 test "a skip counts the ops pushed between it and its end" {
     var s: Script = .init(testing.allocator, "t", "T");
     try s.keyframe(.{ .root = "demo://t" });
diff --git a/src/editor/demos/tour.zig b/src/editor/demos/tour.zig
index 7dcfc7412..a6615a70c 100644
--- a/src/editor/demos/tour.zig
+++ b/src/editor/demos/tour.zig
@@ -138,7 +138,7 @@ pub fn build(s: *Script) !void {
     // Only what this OS draws: a material it lacks is left out, with its caption.
     const materials = [_]struct { kind: []const u8, name: []const u8, caption: ?[]const u8, ms: u32 }{
         .{ .kind = "liquid", .name = "Liquid Glass", .caption = null, .ms = 1800 },
-        .{ .kind = "frost", .name = "frost", .caption = "…frosted…", .ms = 1400 },
+        .{ .kind = "frost", .name = "frosted glass", .caption = "…frosted…", .ms = 1400 },
         .{ .kind = "blur", .name = "blur", .caption = "…blurred…", .ms = 1400 },
         .{ .kind = "transparent", .name = "clear glass", .caption = "…clear, or opaque. Settings › Window keeps your choice.", .ms = 1200 },
         .{ .kind = "none", .name = "opaque", .caption = null, .ms = 1200 },
@@ -199,3 +199,25 @@ pub fn build(s: *Script) !void {
     });
     s.pause(3600);
 }
+
+test "a frost-first tour names the frosted glass it shows" {
+    const std = @import("std");
+    var s: Script = .init(std.testing.allocator, "tour", "Tour");
+    s.lacks = &.{"liquid"};
+    try build(&s);
+    var owned = try s.finish();
+    defer owned.deinit();
+    const tape = owned.tape;
+    const chapter = for (tape.chapters) |ch| {
+        if (std.mem.eql(u8, ch.title, "Materials")) break ch;
+    } else return error.TestUnexpectedResult;
+    const command = for (tape.ops) |op| {
+        if (op.at >= chapter.at and op.do == .command) break op.do.command;
+    } else return error.TestUnexpectedResult;
+    try std.testing.expectEqualStrings("fizzy.windowMaterial", command.id);
+    try std.testing.expectEqualStrings(".{ .kind = \"frost\" }", command.args);
+    const caption = for (tape.captions) |c| {
+        if (c.at >= chapter.at) break c;
+    } else return error.TestUnexpectedResult;
+    try std.testing.expect(std.mem.find(u8, caption.text, "one material, frosted glass here…") != null);
+}