$ mkdir wasm-test-example $ cd wasm-test-example $ swift package init --type library -name WasmTestExample $ swift build --build-tests --experimental-swift-sdk DEVELOPMENT-SNAPSHOT-2024-03-20-a-wasm $ wasmtime .build/debug/WasmTestExamplePackageTests.wasm Test Suite 'All tests' started at  Test Suite 'testBundle.xctest' started at  Test Suite 'WasmTestExampleTests' started at  Test Case 'WasmTestExampleTests.testExample' started at  Test Case 'WasmTestExampleTests.testExample' passed (0.0 seconds) Test Suite 'WasmTestExampleTests' passed at   Executed 1 test, with 0 failures (0 unexpected) in 0.0 (0.0) seconds Test Suite 'testBundle.xctest' passed at   Executed 1 test, with 0 failures (0 unexpected) in 0.0 (0.0) seconds Test Suite 'All tests' passed at   Executed 1 test, with 0 failures (0 unexpected) in 0.0 (0.0) seconds

$ mkdir wasm-test-example $ cd wasm-test-example $ swift package init --type library -name WasmTestExample $ swift build --build-tests --experimental-swift-sdk DEVELOPMENT-SNAPSHOT-2024-03-22-a-wasm $ wasmtime .build/debug/WasmTestExamplePackageTests.wasm Error: failed to run main module `.build/debug/WasmTestExamplePackageTests.wasm` Caused by:  0: failed to invoke command default  1: error while executing at wasm backtrace:  0: 0x60161a - <unknown>!$s10Foundation6BundleC05_mainB033_6273FB07A96EB35BCC520B3A80F5C3CDLL_WZ  1: 0x42d00b - <unknown>!swift_once  2: 0x60167d - <unknown>!$s10Foundation6BundleC4mainACvgZ  3: 0xc7057b - <unknown>!$s6XCTest11XCTMainMisc_9arguments9observersAA19TestSuiteOrExitCodeOSayAA0A4CaseCm04testK5Class_SaySS_yAHKctG8allTeststG_SaySSGSayAA0A11Observation_pGSgtF  4: 0xc70378 - <unknown>!$s6XCTest7XCTMain_9arguments9observerss5Int32VSayAA0A4CaseCm04testF5Class_SaySS_yAHKctG8allTeststG_SaySSGSayAA0A11Observation_pGSgtYaFTY0_  5: 0x4c4830 - <unknown>!swift_task_switchImpl(swift::AsyncContext*, void (swift::AsyncContext* swift_async_context) swiftcall*, swift::SerialExecutorRef)  6: 0x4c46d9 - <unknown>!swift_task_switch  7: 0xc712e7 - <unknown>!$s6XCTest7XCTMainys5NeverOSayAA0A4CaseCm04testD5Class_SaySS_yAFKctG8allTeststGYaFTY0_  8: 0x4c4830 - <unknown>!swift_task_switchImpl(swift::AsyncContext*, void (swift::AsyncContext* swift_async_context) swiftcall*, swift::SerialExecutorRef)  9: 0x4c46d9 - <unknown>!swift_task_switch  10: 0xc71267 - <unknown>!$s6XCTest7XCTMainys5NeverOSayAA0A4CaseCm04testD5Class_SaySS_yAFKctG8allTeststGYaF  11: 0x659f9 - <unknown>!$s27WasmTestExamplePackageTests6RunnerV4mainyyYaFZTY0_  12: 0x4c4830 - <unknown>!swift_task_switchImpl(swift::AsyncContext*, void (swift::AsyncContext* swift_async_context) swiftcall*, swift::SerialExecutorRef)  13: 0x4c46d9 - <unknown>!swift_task_switch  14: 0x65963 - <unknown>!$s27WasmTestExamplePackageTests6RunnerV4mainyyYaFZ  15: 0x65b0f - <unknown>!$s27WasmTestExamplePackageTests6RunnerV5$mainyyYaFZ  16: 0x65cc4 - <unknown>!async_Main  17: 0x65e6e - <unknown>!$sIetH_yts5Error_pIeghHrzo_TR  18: 0x66194 - <unknown>!$sIetH_yts5Error_pIeghHrzo_TRTA  19: 0x4c6370 - <unknown>!future_adapter(swift::AsyncContext*)  20: 0x4c3a44 - <unknown>!swift::runJobInEstablishedExecutorContext(swift::Job*)  21: 0x4c4473 - <unknown>!swift_job_run  22: 0x65def - <unknown>!main  23: 0xc8f258 - <unknown>!__main_void  24: 0x27a3f - <unknown>!_start  note: using the `WASMTIME_BACKTRACE_DETAILS=1` environment variable may show more debugging information  2: wasm trap: wasm `unreachable` instruction executed $ wasmtime --dir / .build/debug/WasmTestExamplePackageTests.wasm Test Suite 'All tests' started at 2024-03-25 12:38:19.073 Test Suite '/.xctest' started at 2024-03-25 12:38:19.074 Test Suite 'WasmTestExampleTests' started at 2024-03-25 12:38:19.074 Test Case 'WasmTestExampleTests.testExample' started at 2024-03-25 12:38:19.074 Test Case 'WasmTestExampleTests.testExample' passed (0.0 seconds) Test Suite 'WasmTestExampleTests' passed at 2024-03-25 12:38:19.074  Executed 1 test, with 0 failures (0 unexpected) in 0.0 (0.0) seconds Test Suite '/.xctest' passed at 2024-03-25 12:38:19.074  Executed 1 test, with 0 failures (0 unexpected) in 0.0 (0.0) seconds Test Suite 'All tests' passed at 2024-03-25 12:38:19.074  Executed 1 test, with 0 failures (0 unexpected) in 0.0 (0.0) seconds