refactor(tests): CMake-based CDB, workspace fixture, test cleanup (#378)

## Summary

- **CMake-based CDB generation for module tests**: Replace hand-written
compile_commands.json with CMakeLists.txt (CMake 3.28 `FILE_SET
CXX_MODULES`) in all 26 `tests/data/modules/*/` directories. CDB is
generated on-the-fly via `cmake -G Ninja` during test setup.
- **`@pytest.mark.workspace()` decorator**: Introduce a marker + fixture
pattern so tests declare their workspace via decorator and receive a
resolved `workspace` path. The fixture auto-generates CDB when a
CMakeLists.txt is present.
- **`CliceClient` helper methods**: Add `initialize()`, `open()`,
`wait_diagnostics()`, and `open_and_wait()` to reduce boilerplate across
all test files.
- **Use `asyncio_mode = "auto"`**: Switch from `@pytest_asyncio.fixture`
+ `@pytest.mark.asyncio` to `@pytest.fixture` + auto mode for proper
Pylance type inference on fixtures.
- **Test cleanup**: Remove redundant section separators and docstrings,
delete `tests/pyproject.toml` (config moved to `pytest.ini`).
- **Format task**: Add `.cppm` to `format-cpp` glob pattern.
- **CI fix**: Disable `CMAKE_CXX_SCAN_FOR_MODULES` and prefer pixi
clang++ to fix macOS CI where CMake rejects module scanning.

## Test plan

- [x] All 26 module test directories have CMakeLists.txt with FILE_SET
CXX_MODULES
- [x] generate_cdb() produces valid compile_commands.json with module
flags
- [x] Integration tests pass locally
- [ ] CI passes on all platforms (Linux, macOS, Windows)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Tests**
* Unified fixtures and client workflow: new init/open/wait helpers,
workspace marker support, bounded diagnostics waiting, CMake-based
compilation-database generation, and directory-backed temp-file
workflows; enabled asyncio test mode.
* **Chores**
* Added many C++20 module test projects and test data; removed prior
test pyproject in favor of pytest config; updated formatter to include
.cppm files.
* **Style**
* Reformatted many module/source implementations to consistent
multi-line function bodies.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

tests/data/modules/chained_modules/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.28)
+project(chained_modules LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES mod_a.cppm mod_b.cppm
+)
+

tests/data/modules/chained_modules/mod_a.cppm

@@ -1,2 +1,5 @@
 export module A;
-export int foo() { return 42; }
+
+export int foo() {
+    return 42;
+}

tests/data/modules/chained_modules/mod_b.cppm

@@ -1,3 +1,6 @@
 export module B;
 import A;
-export int bar() { return foo() + 1; }
+
+export int bar() {
+    return foo() + 1;
+}

tests/data/modules/circular_module_dependency/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.28)
+project(circular_module_dependency LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES cycle_a.cppm cycle_b.cppm ok.cppm
+)
+

tests/data/modules/circular_module_dependency/cycle_a.cppm

@@ -1,3 +1,6 @@
 export module CycA;
 import CycB;
-export int a() { return 1; }
+
+export int a() {
+    return 1;
+}

tests/data/modules/circular_module_dependency/cycle_b.cppm

@@ -1,3 +1,6 @@
 export module CycB;
 import CycA;
-export int b() { return 2; }
+
+export int b() {
+    return 2;
+}

tests/data/modules/circular_module_dependency/ok.cppm

@@ -1,2 +1,5 @@
 export module Ok;
-export int ok() { return 42; }
+
+export int ok() {
+    return 42;
+}

tests/data/modules/class_export_and_inheritance/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.28)
+project(class_export_and_inheritance LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES shape.cppm circle.cppm
+)
+

tests/data/modules/class_export_and_inheritance/circle.cppm

@@ -1,8 +1,13 @@
 export module Circle;
 import Shape;
+
 export class Circle : public Shape {
     int r;
+
 public:
     Circle(int r) : r(r) {}
-    int area() const override { return 3 * r * r; }
+
+    int area() const override {
+        return 3 * r * r;
+    }
 };

tests/data/modules/class_export_and_inheritance/shape.cppm

@@ -1,4 +1,5 @@
 export module Shape;
+
 export class Shape {
 public:
     virtual ~Shape() = default;

tests/data/modules/consumer_imports_module/CMakeLists.txt

@@ -0,0 +1,14 @@
+cmake_minimum_required(VERSION 3.28)
+project(consumer_imports_module LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES math.cppm
+)
+target_sources(test PRIVATE main.cpp)
+

tests/data/modules/consumer_imports_module/math.cppm

@@ -1,2 +1,5 @@
 export module Math;
-export int add(int a, int b) { return a + b; }
+
+export int add(int a, int b) {
+    return a + b;
+}

tests/data/modules/deep_chain/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.28)
+project(deep_chain LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES m1.cppm m2.cppm m3.cppm m4.cppm m5.cppm
+)
+

tests/data/modules/deep_chain/m1.cppm

@@ -1,2 +1,5 @@
 export module M1;
-export int f1() { return 1; }
+
+export int f1() {
+    return 1;
+}

tests/data/modules/deep_chain/m2.cppm

@@ -1,3 +1,6 @@
 export module M2;
 import M1;
-export int f2() { return f1() + 1; }
+
+export int f2() {
+    return f1() + 1;
+}

tests/data/modules/deep_chain/m3.cppm

@@ -1,3 +1,6 @@
 export module M3;
 import M2;
-export int f3() { return f2() + 1; }
+
+export int f3() {
+    return f2() + 1;
+}

tests/data/modules/deep_chain/m4.cppm

@@ -1,3 +1,6 @@
 export module M4;
 import M3;
-export int f4() { return f3() + 1; }
+
+export int f4() {
+    return f3() + 1;
+}

tests/data/modules/deep_chain/m5.cppm

@@ -1,3 +1,6 @@
 export module M5;
 import M4;
-export int f5() { return f4() + 1; }
+
+export int f5() {
+    return f4() + 1;
+}

tests/data/modules/diamond_modules/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.28)
+project(diamond_modules LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES base.cppm left.cppm right.cppm top.cppm
+)
+

tests/data/modules/diamond_modules/base.cppm

@@ -1,2 +1,5 @@
 export module Base;
-export int base_val() { return 10; }
+
+export int base_val() {
+    return 10;
+}

tests/data/modules/diamond_modules/left.cppm

@@ -1,3 +1,6 @@
 export module Left;
 import Base;
-export int left_val() { return base_val() + 1; }
+
+export int left_val() {
+    return base_val() + 1;
+}

tests/data/modules/diamond_modules/right.cppm

@@ -1,3 +1,6 @@
 export module Right;
 import Base;
-export int right_val() { return base_val() + 2; }
+
+export int right_val() {
+    return base_val() + 2;
+}

tests/data/modules/diamond_modules/top.cppm

@@ -1,4 +1,7 @@
 export module Top;
 import Left;
 import Right;
-export int top_val() { return left_val() + right_val(); }
+
+export int top_val() {
+    return left_val() + right_val();
+}

tests/data/modules/dotted_module_name/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.28)
+project(dotted_module_name LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES io.cppm app.cppm
+)
+

tests/data/modules/dotted_module_name/app.cppm

@@ -1,3 +1,6 @@
 export module my.app;
 import my.io;
-export void run() { print(); }
+
+export void run() {
+    print();
+}

tests/data/modules/dotted_module_name/io.cppm

@@ -1,2 +1,3 @@
 export module my.io;
+
 export void print() {}

tests/data/modules/export_block/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.28)
+project(export_block LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES block.cppm consumer.cppm
+)
+

tests/data/modules/export_block/block.cppm

@@ -1,8 +1,18 @@
 export module Block;
 export {
-    int alpha() { return 1; }
-    int beta() { return 2; }
-    namespace ns {
-        int gamma() { return 3; }
+    int alpha() {
+        return 1;
     }
+
+    int beta() {
+        return 2;
+    }
+
+    namespace ns {
+
+    int gamma() {
+        return 3;
+    }
+
+    }  // namespace ns
 }

tests/data/modules/export_block/consumer.cppm

@@ -1,3 +1,6 @@
 export module Consumer;
 import Block;
-export int total() { return alpha() + beta() + ns::gamma(); }
+
+export int total() {
+    return alpha() + beta() + ns::gamma();
+}

tests/data/modules/export_namespace/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.28)
+project(export_namespace LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES ns.cppm calc.cppm
+)
+

tests/data/modules/export_namespace/calc.cppm

@@ -1,3 +1,6 @@
 export module Calc;
 import NS;
-export int compute() { return math::add(3, math::mul(4, 5)); }
+
+export int compute() {
+    return math::add(3, math::mul(4, 5));
+}

tests/data/modules/export_namespace/ns.cppm

@@ -1,5 +1,13 @@
 export module NS;
+
 export namespace math {
-    int add(int a, int b) { return a + b; }
-    int mul(int a, int b) { return a * b; }
+
+int add(int a, int b) {
+    return a + b;
 }
+
+int mul(int a, int b) {
+    return a * b;
+}
+
+}  // namespace math

tests/data/modules/global_module_fragment/CMakeLists.txt

@@ -0,0 +1,14 @@
+cmake_minimum_required(VERSION 3.28)
+project(global_module_fragment LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES gmf.cppm
+)
+target_include_directories(test PRIVATE ${CMAKE_SOURCE_DIR})
+

tests/data/modules/global_module_fragment/gmf.cppm

@@ -1,4 +1,7 @@
 module;
 #include "legacy.h"
 export module GMF;
-export int wrapped() { return legacy_fn(); }
+
+export int wrapped() {
+    return legacy_fn();
+}

tests/data/modules/gmf_with_import/CMakeLists.txt

@@ -0,0 +1,14 @@
+cmake_minimum_required(VERSION 3.28)
+project(gmf_with_import LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES base.cppm combined.cppm
+)
+target_include_directories(test PRIVATE ${CMAKE_SOURCE_DIR})
+

tests/data/modules/gmf_with_import/base.cppm

@@ -1,2 +1,5 @@
 export module Base;
-export int base() { return 100; }
+
+export int base() {
+    return 100;
+}

tests/data/modules/gmf_with_import/combined.cppm

@@ -2,4 +2,7 @@ module;
 #include "util.h"
 export module Combined;
 import Base;
-export int combined() { return base() + util_helper(); }
+
+export int combined() {
+    return base() + util_helper();
+}

tests/data/modules/hover_on_imported_symbol/CMakeLists.txt

@@ -0,0 +1,14 @@
+cmake_minimum_required(VERSION 3.28)
+project(hover_on_imported_symbol LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES defs.cppm
+)
+target_sources(test PRIVATE use.cpp)
+

tests/data/modules/hover_on_imported_symbol/defs.cppm

@@ -1,2 +1,5 @@
 export module Defs;
-export int magic_number() { return 42; }
+
+export int magic_number() {
+    return 42;
+}

tests/data/modules/independent_modules/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.28)
+project(independent_modules LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES x.cppm y.cppm
+)
+

tests/data/modules/independent_modules/x.cppm

@@ -1,2 +1,5 @@
 export module X;
-export int x() { return 1; }
+
+export int x() {
+    return 1;
+}

tests/data/modules/independent_modules/y.cppm

@@ -1,2 +1,5 @@
 export module Y;
-export int y() { return 2; }
+
+export int y() {
+    return 2;
+}

tests/data/modules/module_compile_error/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.28)
+project(module_compile_error LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES good.cppm bad.cppm
+)
+

tests/data/modules/module_compile_error/bad.cppm

@@ -1,3 +1,6 @@
 export module Bad;
 import Good;
-export int bad() { return UNDEFINED_SYMBOL; }
+
+export int bad() {
+    return UNDEFINED_SYMBOL;
+}

tests/data/modules/module_compile_error/good.cppm

@@ -1,2 +1,5 @@
 export module Good;
-export int good() { return 1; }
+
+export int good() {
+    return 1;
+}

tests/data/modules/module_implementation_unit/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.28)
+project(module_implementation_unit LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES greeter.cppm greeter_impl.cpp
+)
+

tests/data/modules/module_partitions/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.28)
+project(module_partitions LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES part_a.cppm part_b.cppm lib.cppm
+)
+

tests/data/modules/module_partitions/lib.cppm

@@ -1,4 +1,7 @@
 export module Lib;
 export import :A;
 export import :B;
-export int lib_fn() { return a_fn() + b_fn(); }
+
+export int lib_fn() {
+    return a_fn() + b_fn();
+}

tests/data/modules/module_partitions/part_a.cppm

@@ -1,2 +1,5 @@
 export module Lib:A;
-export int a_fn() { return 1; }
+
+export int a_fn() {
+    return 1;
+}

tests/data/modules/module_partitions/part_b.cppm

@@ -1,2 +1,5 @@
 export module Lib:B;
-export int b_fn() { return 2; }
+
+export int b_fn() {
+    return 2;
+}

tests/data/modules/no_modules_plain_cpp/CMakeLists.txt

@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.28)
+project(no_modules_plain_cpp LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test STATIC plain.cpp)
+

tests/data/modules/partition_chain/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.28)
+project(partition_chain LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES types.cppm core.cppm sys.cppm
+)
+

tests/data/modules/partition_chain/core.cppm

@@ -1,3 +1,6 @@
 export module Sys:Core;
 import :Types;
-export Config make_config() { return {42}; }
+
+export Config make_config() {
+    return {42};
+}

tests/data/modules/partition_chain/types.cppm

@@ -1,2 +1,5 @@
 export module Sys:Types;
-export struct Config { int value = 0; };
+
+export struct Config {
+    int value = 0;
+};

tests/data/modules/partition_interface/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.28)
+project(partition_interface LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES part.cppm primary.cppm
+)
+

tests/data/modules/partition_interface/part.cppm

@@ -1,2 +1,5 @@
 export module M:Part;
-export int part_fn() { return 5; }
+
+export int part_fn() {
+    return 5;
+}

tests/data/modules/partition_interface/primary.cppm

@@ -1,3 +1,6 @@
 export module M;
 export import :Part;
-export int primary_fn() { return part_fn() + 1; }
+
+export int primary_fn() {
+    return part_fn() + 1;
+}

tests/data/modules/partition_with_external_import/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.28)
+project(partition_with_external_import LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES ext.cppm part.cppm app.cppm
+)
+

tests/data/modules/partition_with_external_import/ext.cppm

@@ -1,2 +1,5 @@
 export module Ext;
-export int ext_val() { return 99; }
+
+export int ext_val() {
+    return 99;
+}

tests/data/modules/partition_with_external_import/part.cppm

@@ -1,3 +1,6 @@
 export module App:Core;
 import Ext;
-export int core_fn() { return ext_val() + 1; }
+
+export int core_fn() {
+    return ext_val() + 1;
+}

tests/data/modules/partition_with_gmf/CMakeLists.txt

@@ -0,0 +1,14 @@
+cmake_minimum_required(VERSION 3.28)
+project(partition_with_gmf LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES part_cfg.cppm cfg.cppm
+)
+target_include_directories(test PRIVATE ${CMAKE_SOURCE_DIR})
+

tests/data/modules/private_module_fragment/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.28)
+project(private_module_fragment LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES priv.cppm
+)
+

tests/data/modules/private_module_fragment/priv.cppm

@@ -1,5 +1,11 @@
 export module Priv;
 export int public_fn();
-module : private;
-int public_fn() { return 42; }
-int private_helper() { return 7; }
+module :private;
+
+int public_fn() {
+    return 42;
+}
+
+int private_helper() {
+    return 7;
+}

tests/data/modules/re_export/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.28)
+project(re_export LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES core.cppm wrapper.cppm user.cppm
+)
+

tests/data/modules/re_export/core.cppm

@@ -1,2 +1,5 @@
 export module Core;
-export int core_fn() { return 1; }
+
+export int core_fn() {
+    return 1;
+}

tests/data/modules/re_export/user.cppm

@@ -1,3 +1,6 @@
 export module User;
 import Wrapper;
-export int use_fn() { return core_fn() + wrap_fn(); }
+
+export int use_fn() {
+    return core_fn() + wrap_fn();
+}

tests/data/modules/re_export/wrapper.cppm

@@ -1,3 +1,6 @@
 export module Wrapper;
 export import Core;
-export int wrap_fn() { return core_fn() + 10; }
+
+export int wrap_fn() {
+    return core_fn() + 10;
+}

tests/data/modules/save_recompile/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.28)
+project(save_recompile LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES leaf.cppm mid.cppm
+)
+

tests/data/modules/save_recompile/leaf.cppm

@@ -1,2 +1,5 @@
 export module Leaf;
-export int leaf() { return 1; }
+
+export int leaf() {
+    return 1;
+}

tests/data/modules/save_recompile/mid.cppm

@@ -1,3 +1,6 @@
 export module Mid;
 import Leaf;
-export int mid() { return leaf() + 1; }
+
+export int mid() {
+    return leaf() + 1;
+}

tests/data/modules/single_module_no_deps/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.28)
+project(single_module_no_deps LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES mod_a.cppm
+)
+

tests/data/modules/single_module_no_deps/mod_a.cppm

@@ -1,2 +1,5 @@
 export module A;
-export int foo() { return 42; }
+
+export int foo() {
+    return 42;
+}

tests/data/modules/template_export/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.28)
+project(template_export LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(test)
+target_sources(test
+    PUBLIC
+    FILE_SET CXX_MODULES
+    FILES tmpl.cppm use_tmpl.cppm
+)
+

tests/data/modules/template_export/tmpl.cppm

@@ -1,5 +1,11 @@
 export module Tmpl;
-export template<typename T>
-T identity(T x) { return x; }
-export template<typename T, typename U>
-auto pair_sum(T a, U b) { return a + b; }
+
+export template <typename T>
+T identity(T x) {
+    return x;
+}
+
+export template <typename T, typename U>
+auto pair_sum(T a, U b) {
+    return a + b;
+}

tests/data/modules/template_export/use_tmpl.cppm

@@ -1,3 +1,6 @@
 export module UseTmpl;
 import Tmpl;
-export int test() { return identity(42) + pair_sum(1, 2); }
+
+export int test() {
+    return identity(42) + pair_sum(1, 2);
+}