$ cat Tests/helloTests/helloTests.swift import XCTest final class helloTests: XCTestCase { func testExample() throws { XCTAssertTrue(true) } static var allTests = [ ("testExample", testExample), ] } $ ~/Downloads/swift-wasm-DEVELOPMENT-SNAPSHOT-2020-10-05-a.xctoolchain/usr/bin/swift build -c debug --build-tests --destination wasm-5.3-SNAPSHOT-2020-09-08-a.json [12/12] Linking helloPackageTests.xctest /var/folders/br/7sr_p7cj7v549x_gtkb33df00000gp/T/tmp.BSZU6PLa $ wasmer ./.build/debug/helloPackageTests.xctest Test Suite 'All tests' started at 2020-10-06 17:24:16.346 Test Suite 'testBundle.xctest' started at 2020-10-06 17:24:16.346 Test Suite 'helloTests' started at 2020-10-06 17:24:16.346 Test Case 'helloTests.testExample' started at 2020-10-06 17:24:16.346 Test Case 'helloTests.testExample' passed (0.0 seconds) Test Suite 'helloTests' passed at 2020-10-06 17:24:16.346 Executed 1 test, with 0 failures (0 unexpected) in 0.0 (0.0) seconds Test Suite 'testBundle.xctest' passed at 2020-10-06 17:24:16.347 Executed 1 test, with 0 failures (0 unexpected) in 0.0 (0.0) seconds Test Suite 'All tests' passed at 2020-10-06 17:24:16.347 Executed 1 test, with 0 failures (0 unexpected) in 0.0 (0.0) seconds