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Add basic integration tests for Swift Testing.
This PR adds some tests for Swift Testing that mirror the tests for XCTest, and updates the `swift-package-init-lib.md` test to test for both libraries separately.
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‎README.md‎

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2020

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Here is a partial list of tests in the repository:
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| Test Name | Functionality |
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|--------------------------|------------------------------------------------------------------|
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| basic | Check output of `swift --version` |
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| example-package-dealer | Build the example package-dealer package |
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| repl | Various REPL sanity checks, notably importing Darwin and Glibc |
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| swift-build-self-host | Use swift build to build itself |
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| swift-compiler | Compile a basic swift file |
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| test-c-library-swiftpm | Build a package that links a 3rd party library |
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| test-foundation-package | Build a package that imports Foundation |
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| test-import-glibc | Compile a source file importing and using Glibc |
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| test-multi-compile | Compile multiple source files into an executable |
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| test-multi-compile-glibc | Compile multiple source files importing Glibc into an executable |
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| test-static-lib | Compile multiple source files into a static library |
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| test-xctest-package | Build a package that imports XCTest |
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| Test Name | Functionality |
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|----------------------------|------------------------------------------------------------------|
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| basic | Check output of `swift --version` |
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| example-package-dealer | Build the example package-dealer package |
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| repl | Various REPL sanity checks, notably importing Darwin and Glibc |
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| swift-build-self-host | Use swift build to build itself |
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| swift-compiler | Compile a basic swift file |
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| test-c-library-swiftpm | Build a package that links a 3rd party library |
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| test-foundation-package | Build a package that imports Foundation |
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| test-import-glibc | Compile a source file importing and using Glibc |
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| test-multi-compile | Compile multiple source files into an executable |
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| test-multi-compile-glibc | Compile multiple source files importing Glibc into an executable |
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| test-static-lib | Compile multiple source files into a static library |
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| test-xctest-package | Build a package that imports XCTest |
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| test-swift-testing-package | Build a package that imports Swift Testing |
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‎swift-package-init-lib.md‎

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```
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RUN: rm -rf %t.dir
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RUN: mkdir -p %t.dir/Project
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RUN: %{swift-package} --package-path %t.dir/Project init --type library
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RUN: %{swift-package} --package-path %t.dir/Project init --type library --enable-xctest --enable-swift-testing
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RUN: %{swift-build} --package-path %t.dir/Project 2>&1 | tee %t.build-log
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RUN: %{swift-test} --package-path %t.dir/Project 2>&1 | tee %t.test-log
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RUN: %{swift-test} --package-path %t.dir/Project --enable-xctest --disable-swift-testing 2>&1 | tee %t.xctest-log
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RUN: %{swift-test} --package-path %t.dir/Project --disable-xctest --enable-swift-testing 2>&1 | tee %t.swift-testing-log
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```
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## Check the build log.
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CHECK-BUILD-LOG: Compiling {{.*}}Project{{.*}}
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```
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## Check the test log.
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## Check the XCTest log.
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```
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RUN: %{FileCheck} --check-prefix CHECK-TEST-LOG --input-file %t.test-log %s
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RUN: %{FileCheck} --check-prefix CHECK-XCTEST-LOG --input-file %t.xctest-log %s
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```
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```
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CHECK-TEST-LOG: Compiling {{.*}}ProjectTests{{.*}}
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CHECK-TEST-LOG: Test Suite 'All tests' passed
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CHECK-TEST-LOG-NEXT: Executed 1 test
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CHECK-XCTEST-LOG: Compiling {{.*}}ProjectTests{{.*}}
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CHECK-XCTEST-LOG: Test Suite 'All tests' passed
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CHECK-XCTEST-LOG-NEXT: Executed 1 test
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```
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## Check the Swift Testing log.
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```
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RUN: %{FileCheck} --check-prefix CHECK-SWIFT-TESTING-LOG --input-file %t.swift-testing-log %s
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```
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```
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CHECK-SWIFT-TESTING-LOG: Test run started.
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CHECK-SWIFT-TESTING-LOG: Test run with 1 test passed after {{.*}} seconds.
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```
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## Check there were no compile errors or warnings.
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```
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RUN: %{FileCheck} --check-prefix CHECK-NO-WARNINGS-OR-ERRORS --input-file %t.build-log %s
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RUN: %{FileCheck} --check-prefix CHECK-NO-WARNINGS-OR-ERRORS --input-file %t.test-log %s
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RUN: %{FileCheck} --check-prefix CHECK-NO-WARNINGS-OR-ERRORS --input-file %t.xctest-log %s
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RUN: %{FileCheck} --check-prefix CHECK-NO-WARNINGS-OR-ERRORS --input-file %t.swift-testing-log %s
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```
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```

‎test-swift-testing-package/Tests.swift‎

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import Testing
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@Test func test_example() {
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print("HI")
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}

‎test-swift-testing-package/test-swift-testing-package.txt‎

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// swift-tools-version:6.0
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// Trivial test for importing Swift Testing.
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//
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// REQUIRES: platform=Linux
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//
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// Make a sandbox dir.
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// RUN: rm -rf %t.dir
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// RUN: mkdir -p %t.dir/tool
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// RUN: cp %s %t.dir/tool/Package.swift
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// RUN: cp %S/Tests.swift %t.dir/tool/Tests.swift
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// RUN: %{swift-build} --build-tests --package-path %t.dir/tool -v 2>&1 | tee %t.build-log
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//
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// Check the build log.
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//
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// RUN: %{FileCheck} --check-prefix CHECK-BUILD-LOG --input-file %t.build-log %s
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//
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// CHECK-BUILD-LOG: swiftc{{.*}} -module-name tool
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//
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// Verify that the tool exists and works.
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//
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// RUN: test -x %t.dir/tool/.build/debug/toolPackageTests.xctest
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// RUN: %t.dir/tool/.build/debug/toolPackageTests.xctest --testing-library swift-testing > %t.out
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// RUN: %{FileCheck} --check-prefix CHECK-TOOL-OUTPUT --input-file %t.out %s
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//
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// CHECK-TOOL-OUTPUT: HI
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import PackageDescription
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let package = Package(
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name: "tool",
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targets: [
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.testTarget(name: "tool", path: "./"),
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]
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)

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