diff --git a/utils/build-presets.ini b/utils/build-presets.ini
index 2e83a50dbbe9a..b857c8799a39e 100644
--- a/utils/build-presets.ini
+++ b/utils/build-presets.ini
@@ -379,6 +379,8 @@ sourcekit-lsp
 # swift-inspect
 swiftsyntax
 swiftformat
+swift-testing
+swift-testing-macros
 
 skstresstester
 
@@ -402,6 +404,8 @@ install-swiftpm
 install-swift-driver
 install-swiftsyntax
 install-swiftformat
+install-swift-testing
+install-swift-testing-macros
 
 [preset: buildbot_incremental,tools=RA,stdlib=RA,apple_silicon]
 mixin-preset=buildbot_incremental,tools=RA,stdlib=RA
@@ -835,6 +839,8 @@ mixin-preset=
 llbuild
 swiftpm
 swift-driver
+swift-testing
+swift-testing-macros
 xctest
 libicu
 swiftdocc
@@ -849,6 +855,8 @@ install-llbuild
 install-swiftpm
 install-swift-driver
 install-swiftsyntax
+install-swift-testing
+install-swift-testing-macros
 install-xctest
 install-libicu
 install-prefix=/usr
@@ -1169,12 +1177,15 @@ llbuild
 swiftpm
 swift-driver
 xctest
+swift-testing
+swift-testing-macros
 foundation
 libdispatch
 swiftsyntax
 swiftformat
 indexstore-db
 sourcekit-lsp
+
 install-llvm
 install-static-linux-config
 install-swift
@@ -1186,6 +1197,8 @@ install-swiftsyntax
 install-foundation
 install-libdispatch
 install-xctest
+install-swift-testing
+install-swift-testing-macros
 install-swiftformat
 
 [preset: buildbot_incremental_linux,long_test]
@@ -1309,6 +1322,8 @@ swift-driver
 # Failing to build in CI: rdar://78408440
 # swift-inspect
 swiftsyntax
+swift-testing
+swift-testing-macros
 swiftformat
 playgroundsupport
 indexstore-db
@@ -1351,6 +1366,8 @@ install-llbuild
 install-swiftpm
 install-swift-driver
 install-swiftsyntax
+install-swift-testing
+install-swift-testing-macros
 install-playgroundsupport
 install-sourcekit-lsp
 install-swiftformat
@@ -1652,6 +1669,8 @@ swiftpm
 # swift-inspect
 swift-driver
 swiftsyntax
+swift-testing
+swift-testing-macros
 swiftformat
 swiftdocc
 
@@ -1671,6 +1690,8 @@ install-llbuild
 install-swiftpm
 install-swift-driver
 install-swiftsyntax
+install-swift-testing
+install-swift-testing-macros
 install-swiftdocc
 install-swiftformat
 
diff --git a/utils/build.ps1 b/utils/build.ps1
index 6a94a49ec453c..eeeeb0e57cd60 100644
--- a/utils/build.ps1
+++ b/utils/build.ps1
@@ -187,6 +187,7 @@ $ArchX64 = @{
   PlatformInstallRoot = "$BinaryCache\x64\Windows.platform";
   SDKInstallRoot = "$BinaryCache\x64\Windows.platform\Developer\SDKs\Windows.sdk";
   XCTestInstallRoot = "$BinaryCache\x64\Windows.platform\Developer\Library\XCTest-development";
+  SwiftTestingInstallRoot = "$BinaryCache\x64\Windows.platform\Developer\Library\Testing-development";
   ToolchainInstallRoot = "$BinaryCache\x64\toolchains\$ProductVersion+Asserts";
 }
 
@@ -202,6 +203,7 @@ $ArchX86 = @{
   PlatformInstallRoot = "$BinaryCache\x86\Windows.platform";
   SDKInstallRoot = "$BinaryCache\x86\Windows.platform\Developer\SDKs\Windows.sdk";
   XCTestInstallRoot = "$BinaryCache\x86\Windows.platform\Developer\Library\XCTest-development";
+  SwiftTestingInstallRoot = "$BinaryCache\x86\Windows.platform\Developer\Library\Testing-development";
 }
 
 $ArchARM64 = @{
@@ -217,6 +219,7 @@ $ArchARM64 = @{
   SDKInstallRoot = "$BinaryCache\arm64\Windows.platform\Developer\SDKs\Windows.sdk";
   XCTestInstallRoot = "$BinaryCache\arm64\Windows.platform\Developer\Library\XCTest-development";
   ToolchainInstallRoot = "$BinaryCache\arm64\toolchains\$ProductVersion+Asserts";
+  SwiftTestingInstallRoot = "$BinaryCache\arm64\Windows.platform\Developer\Library\Testing-development";
 }
 
 $HostArch = switch ($HostArchName) {
@@ -284,6 +287,7 @@ enum TargetComponent {
   Dispatch
   Foundation
   XCTest
+  SwiftTesting
 }
 
 function Get-TargetProjectBinaryCache($Arch, [TargetComponent]$Project) {
@@ -311,6 +315,7 @@ enum HostComponent {
   LMDB
   SymbolKit
   DocC
+  SwiftTestingMacros
 }
 
 function Get-HostProjectBinaryCache([HostComponent]$Project) {
@@ -1548,11 +1553,43 @@ function Build-XCTest([Platform]$Platform, $Arch, [switch]$Test = $false) {
         dispatch_DIR = "$DispatchBinaryCache\cmake\modules";
         Foundation_DIR = "$FoundationBinaryCache\cmake\modules";
       } + $TestingDefines)
+  }
+}
+
+function Build-SwiftTesting([Platform]$Platform, $Arch, [switch]$Test = $false) {
+  $SwiftTestingBinaryCache = Get-TargetProjectBinaryCache $Arch SwiftTesting
+
+  Isolate-EnvVars {
+    if ($Test) {
+      # TODO: Test
+      return
+    } else {
+      $Targets = @("default")
+      $InstallPath = "$($Arch.SwiftTestingInstallRoot)\usr"
+    }
 
+    Build-CMakeProject `
+      -Src $SourceCache\swift-testing `
+      -Bin $SwiftTestingBinaryCache `
+      -InstallTo $InstallPath `
+      -Arch $Arch `
+      -Platform $Platform `
+      -UseBuiltCompilers C,CXX,Swift `
+      -BuildTargets $Targets `
+      -Defines (@{
+        BUILD_SHARED_LIBS = "YES";
+        CMAKE_BUILD_WITH_INSTALL_RPATH = "YES";
+        SwiftSyntax_DIR = (Get-HostProjectCMakeModules Compilers);
+        # FIXME: Build the plugin for the builder and specify the path.
+        SwiftTesting_MACRO = "NO";
+      })
+  }
+}
+
+function Write-PlatformInfoPlist([Platform]$Platform, $Arch) {
     $PList = [IO.Path]::Combine($Arch.BinaryCache, "${Platform}.platform".ToLower(), "Info.plist")
-    Invoke-Program $python -c "import plistlib; print(str(plistlib.dumps({ 'DefaultProperties': { 'XCTEST_VERSION': 'development', 'SWIFTC_FLAGS': ['-use-ld=lld'] } }), encoding='utf-8'))" `
+    Invoke-Program $python -c "import plistlib; print(str(plistlib.dumps({ 'DefaultProperties': { 'XCTEST_VERSION': 'development', 'SWIFT_TESTING_VERSION': 'development', 'SWIFTC_FLAGS': ['-use-ld=lld'] } }), encoding='utf-8'))" `
       -OutFile "$PList"
-  }
 }
 
 # Copies files installed by CMake from the arch-specific platform root,
@@ -1956,6 +1993,21 @@ function Build-SourceKitLSP($Arch) {
     }
 }
 
+function Build-SwiftTestingMacros($Arch) {
+  Build-CMakeProject `
+    -Src $SourceCache\swift-testing\Sources\TestingMacros `
+    -Bin (Get-HostProjectBinaryCache SwiftTestingMacros) `
+    -InstallTo "$($Arch.ToolchainInstallRoot)\usr" `
+    -Arch $Arch `
+    -Platform Windows `
+    -UseBuiltCompilers Swift `
+    -SwiftSDK ([IO.Path]::Combine((Get-InstallDir $HostArch), "Platforms", "Windows.platform", "Developer", "SDKs", "Windows.sdk")) `
+    -BuildTargets default `
+    -Defines @{
+      SwiftSyntax_DIR = (Get-HostProjectCMakeModules Compilers);
+    }
+}
+
 function Install-HostToolchain() {
   if ($ToBatch) { return }
 
@@ -2116,6 +2168,8 @@ if (-not $SkipBuild) {
     Invoke-BuildStep Build-FoundationMacros -Build Windows $BuildArch
     Invoke-BuildStep Build-Foundation Windows $Arch
     Invoke-BuildStep Build-XCTest Windows $Arch
+    Invoke-BuildStep Build-SwiftTesting Windows $Arch
+    Invoke-BuildStep Write-PlatformInfoPlist Windows $Arch
   }
 }
 
@@ -2139,6 +2193,8 @@ if (-not $ToBatch) {
 }
 
 if (-not $SkipBuild) {
+  # TestingMacros can't be built before the standard library for the host as it is required for the Swift code.
+  Invoke-BuildStep Build-SwiftTestingMacros $HostArch
   Invoke-BuildStep Build-SQLite $HostArch
   Invoke-BuildStep Build-System $HostArch
   Invoke-BuildStep Build-ToolsSupportCore $HostArch
@@ -2193,6 +2249,9 @@ if (-not $IsCrossCompiling) {
   if ($Test -contains "xctest") {
     Build-XCTest Windows $HostArch -Test
   }
+  if ($Test -contains "testing") {
+    Build-SwiftTesting Windows $HostArch -Test
+  }
   if ($Test -contains "llbuild") { Build-LLBuild $HostArch -Test }
   if ($Test -contains "swiftpm") { Test-PackageManager $HostArch }
 }
diff --git a/utils/build_swift/build_swift/driver_arguments.py b/utils/build_swift/build_swift/driver_arguments.py
index 360b507b82e87..cd9480cc7b3a3 100644
--- a/utils/build_swift/build_swift/driver_arguments.py
+++ b/utils/build_swift/build_swift/driver_arguments.py
@@ -811,6 +811,16 @@ def create_argument_parser():
     option(['--wasmkit'], toggle_true('build_wasmkit'),
            help='build WasmKit')
 
+    option('--swift-testing', toggle_true('build_swift_testing'),
+           help='build Swift Testing')
+    option('--install-swift-testing', toggle_true('install_swift_testing'),
+           help='install Swift Testing')
+    option('--swift-testing-macros', toggle_true('build_swift_testing_macros'),
+           help='build Swift Testing macro plugin')
+    option('--install-swift-testing-macros',
+           toggle_true('install_swift_testing_macros'),
+           help='install Swift Testing macro plugin')
+
     option('--xctest', toggle_true('build_xctest'),
            help='build xctest')
 
diff --git a/utils/build_swift/tests/expected_options.py b/utils/build_swift/tests/expected_options.py
index c90e7367d1e17..5d1a6a6898aac 100644
--- a/utils/build_swift/tests/expected_options.py
+++ b/utils/build_swift/tests/expected_options.py
@@ -95,6 +95,8 @@
     'build_swiftpm': False,
     'build_swift_driver': False,
     'build_swift_libexec': True,
+    'build_swift_testing': False,
+    'build_swift_testing_macros': False,
     'build_early_swift_driver': True,
     'build_early_swiftsyntax': True,
     'build_swiftsyntax': False,
@@ -111,6 +113,8 @@
     'install_static_linux_config': False,
     'install_swiftpm': False,
     'install_swiftsyntax': False,
+    'install_swift_testing': False,
+    'install_swift_testing_macros': False,
     'install_swift_driver': False,
     'install_swiftdocc': False,
     'swiftsyntax_verify_generated_files': False,
@@ -565,6 +569,8 @@ class BuildScriptImplOption(_BaseOption):
     SetTrueOption('--swiftpm', dest='build_swiftpm'),
     SetTrueOption('--swift-driver', dest='build_swift_driver'),
     SetTrueOption('--swiftsyntax', dest='build_swiftsyntax'),
+    SetTrueOption('--swift-testing', dest='build_swift_testing'),
+    SetTrueOption('--swift-testing-macros', dest='build_swift_testing_macros'),
     SetTrueOption('--skstresstester', dest='build_skstresstester'),
     SetTrueOption('--swiftformat', dest='build_swiftformat'),
     SetTrueOption('--swiftdocc', dest='build_swiftdocc'),
@@ -644,6 +650,9 @@ class BuildScriptImplOption(_BaseOption):
     EnableOption('--install-llvm', dest='install_llvm'),
     EnableOption('--install-static-linux-config', dest='install_static_linux_config'),
     EnableOption('--install-swiftsyntax', dest='install_swiftsyntax'),
+    EnableOption('--install-swift-testing', dest='install_swift_testing'),
+    EnableOption('--install-swift-testing-macros',
+                 dest='install_swift_testing_macros'),
     EnableOption('--swiftsyntax-verify-generated-files',
                  dest='swiftsyntax_verify_generated_files'),
     EnableOption('--swiftsyntax-enable-rawsyntax-validation',
diff --git a/utils/swift_build_support/swift_build_support/build_script_invocation.py b/utils/swift_build_support/swift_build_support/build_script_invocation.py
index d14f79359bc24..772c6e0f15988 100644
--- a/utils/swift_build_support/swift_build_support/build_script_invocation.py
+++ b/utils/swift_build_support/swift_build_support/build_script_invocation.py
@@ -662,6 +662,10 @@ def compute_product_pipelines(self):
         # Begin the post build-script-impl build phase.
         builder.begin_pipeline()
 
+        builder.add_product(products.SwiftTestingMacros,
+                            is_enabled=self.args.build_swift_testing_macros)
+        builder.add_product(products.SwiftTesting,
+                            is_enabled=self.args.build_swift_testing)
         builder.add_product(products.SwiftPM,
                             is_enabled=self.args.build_swiftpm)
         builder.add_product(products.SwiftSyntax,
diff --git a/utils/swift_build_support/swift_build_support/productpipeline_list_builder.py b/utils/swift_build_support/swift_build_support/productpipeline_list_builder.py
index 09c16611090ef..056e8af2f117f 100644
--- a/utils/swift_build_support/swift_build_support/productpipeline_list_builder.py
+++ b/utils/swift_build_support/swift_build_support/productpipeline_list_builder.py
@@ -101,7 +101,7 @@ def add_product(self, product_cls, is_enabled):
         self.current_pipeline.append(product_cls, is_enabled)
 
     def add_impl_product(self, product_cls, is_enabled):
-        """Add a non-impl product to the current pipeline begin constructed"""
+        """Add an impl product to the current pipeline begin constructed"""
         assert self.current_pipeline is not None
         assert self.is_current_pipeline_impl
         assert product_cls.is_build_script_impl_product()
diff --git a/utils/swift_build_support/swift_build_support/products/__init__.py b/utils/swift_build_support/swift_build_support/products/__init__.py
index 3af36fe224847..e2d657702b169 100644
--- a/utils/swift_build_support/swift_build_support/products/__init__.py
+++ b/utils/swift_build_support/swift_build_support/products/__init__.py
@@ -30,6 +30,8 @@
 from .sourcekitlsp import SourceKitLSP
 from .staticswiftlinux import StaticSwiftLinuxConfig
 from .swift import Swift
+from .swift_testing import SwiftTesting
+from .swift_testing_macros import SwiftTestingMacros
 from .swiftdocc import SwiftDocC
 from .swiftdoccrender import SwiftDocCRender
 from .swiftdriver import SwiftDriver
@@ -65,6 +67,8 @@
     'SwiftInspect',
     'SwiftPM',
     'SwiftDriver',
+    'SwiftTesting',
+    'SwiftTestingMacros',
     'EarlySwiftDriver',
     'XCTest',
     'SwiftSyntax',
diff --git a/utils/swift_build_support/swift_build_support/products/product.py b/utils/swift_build_support/swift_build_support/products/product.py
index ababc351f95ee..a3f2bc91c2148 100644
--- a/utils/swift_build_support/swift_build_support/products/product.py
+++ b/utils/swift_build_support/swift_build_support/products/product.py
@@ -293,7 +293,8 @@ def target_for_platform(self, platform, arch, include_version=True):
                 arch, self.args.darwin_deployment_version_xros)
         return target
 
-    def generate_darwin_toolchain_file(self, platform, arch):
+    def generate_darwin_toolchain_file(self, platform, arch,
+                                       macos_deployment_version=None):
         """
         Generates a new CMake tolchain file that specifies Darwin as a target
         plaftorm.
@@ -306,9 +307,14 @@ def generate_darwin_toolchain_file(self, platform, arch):
 
         cmake_osx_sysroot = xcrun.sdk_path(platform)
 
-        target = self.target_for_platform(platform, arch)
-        if not target:
-            raise RuntimeError('Unhandled platform {}?!'.format(platform))
+        if platform == 'macosx':
+            if macos_deployment_version is None:
+                macos_deployment_version = self.args.darwin_deployment_version_osx
+            target = '{}-apple-macosx{}'.format(arch, macos_deployment_version)
+        else:
+            target = self.target_for_platform(platform, arch)
+            if not target:
+                raise RuntimeError('Unhandled platform {}?!'.format(platform))
 
         toolchain_args = {}
 
@@ -429,7 +435,8 @@ def generate_linux_toolchain_file(self, platform, arch):
 
         return toolchain_file
 
-    def generate_toolchain_file_for_darwin_or_linux(self, host_target):
+    def generate_toolchain_file_for_darwin_or_linux(
+            self, host_target, override_macos_deployment_version=None):
         """
         Checks `host_target` platform and generates a new CMake tolchain file
         appropriate for that target plaftorm (either Darwin or Linux). Defines
@@ -448,7 +455,9 @@ def generate_toolchain_file_for_darwin_or_linux(self, host_target):
 
         toolchain_file = None
         if self.is_darwin_host(host_target):
-            toolchain_file = self.generate_darwin_toolchain_file(platform, arch)
+            toolchain_file = self.generate_darwin_toolchain_file(
+                platform, arch,
+                macos_deployment_version=override_macos_deployment_version)
             self.cmake_options.define('CMAKE_TOOLCHAIN_FILE:PATH', toolchain_file)
         elif platform == "linux":
             toolchain_file = self.generate_linux_toolchain_file(platform, arch)
diff --git a/utils/swift_build_support/swift_build_support/products/swift_testing.py b/utils/swift_build_support/swift_build_support/products/swift_testing.py
new file mode 100644
index 0000000000000..474724baddb0e
--- /dev/null
+++ b/utils/swift_build_support/swift_build_support/products/swift_testing.py
@@ -0,0 +1,117 @@
+# swift_build_support/products/swift_testing.py -----------------*- python -*-
+#
+# This source file is part of the Swift.org open source project
+#
+# Copyright (c) 2024 Apple Inc. and the Swift project authors
+# Licensed under Apache License v2.0 with Runtime Library Exception
+#
+# See https://swift.org/LICENSE.txt for license information
+# See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+#
+# ----------------------------------------------------------------------------
+
+import os
+
+from build_swift.build_swift.versions import Version
+
+from . import cmake_product
+from . import product
+from . import swift
+from . import swift_testing_macros
+
+
+class SwiftTesting(product.Product):
+    @classmethod
+    def is_build_script_impl_product(cls):
+        return False
+
+    @classmethod
+    def is_before_build_script_impl_product(cls):
+        return False
+
+    @classmethod
+    def product_source_name(cls):
+        return "swift-testing"
+
+    @classmethod
+    def get_dependencies(cls):
+        return [swift.Swift,
+                swift_testing_macros.SwiftTestingMacros]
+
+    def should_build(self, host_target):
+        return True
+
+    def should_test(self, host_target):
+        # TODO: Implement.
+        return False
+
+    def should_install(self, host_target):
+        return self.args.install_swift_testing_macros
+
+    def _cmake_product(self, host_target):
+        build_root = os.path.dirname(self.build_dir)
+        build_dir = os.path.join(
+            build_root, '%s-%s' % (self.product_name(), host_target))
+
+        return SwiftTestingCMakeShim(
+            args=self.args,
+            toolchain=self.toolchain,
+            source_dir=self.source_dir,
+            build_dir=build_dir)
+
+    def _build_with_cmake(self, host_target):
+        self._cmake_product(host_target).build(host_target)
+
+    def build(self, host_target):
+        self._build_with_cmake(host_target)
+
+        # For Darwin host, 'build' is only called for the builder.
+        # Manually iterate the cross compile hosts.
+        if self.has_cross_compile_hosts() and self.is_darwin_host(host_target):
+            for target in self.args.cross_compile_hosts:
+                self._build_with_cmake(target)
+
+        # FIXME: build testing library for 'stdlib_deployment_targets'?
+        pass
+
+    def _install_with_cmake(self, host_target):
+        self._cmake_product(host_target).install(host_target)
+
+    def install(self, host_target):
+        self._install_with_cmake(host_target)
+
+        # For Darwin host, 'install' is only called for the builder.
+        # Manually iterate the cross compile hosts.
+        if self.has_cross_compile_hosts() and self.is_darwin_host(host_target):
+            for target in self.args.cross_compile_hosts:
+                self._install_with_cmake(target)
+
+
+class SwiftTestingCMakeShim(cmake_product.CMakeProduct):
+    def build(self, host_target):
+        override_deployment_version = None
+        if host_target.startswith('macosx'):
+            if Version(self.args.darwin_deployment_version_osx) < Version('10.15'):
+                override_deployment_version = '10.15'
+
+        self.cmake_options.define('BUILD_SHARED_LIBS', 'YES')
+
+        # Use empty CMake install prefix, since the `DESTDIR` env var is set by
+        # `install_with_cmake` later which already has the same prefix.
+        self.cmake_options.define('CMAKE_INSTALL_PREFIX', '')
+
+        self.cmake_options.define('CMAKE_BUILD_TYPE', self.args.build_variant)
+
+        # FIXME: If we build macros for the builder, specify the path.
+        self.cmake_options.define('SwiftTesting_MACRO', 'NO')
+
+        self.generate_toolchain_file_for_darwin_or_linux(
+            host_target, override_macos_deployment_version=override_deployment_version)
+        self.build_with_cmake([], self.args.build_variant, [],
+                              prefer_native_toolchain=True)
+
+    def install(self, host_target):
+        install_destdir = self.host_install_destdir(host_target)
+        install_prefix = install_destdir + self.args.install_prefix
+
+        self.install_with_cmake(['install'], install_prefix)
diff --git a/utils/swift_build_support/swift_build_support/products/swift_testing_macros.py b/utils/swift_build_support/swift_build_support/products/swift_testing_macros.py
new file mode 100644
index 0000000000000..38e2d8ab3a8fa
--- /dev/null
+++ b/utils/swift_build_support/swift_build_support/products/swift_testing_macros.py
@@ -0,0 +1,112 @@
+# swift_build_support/products/swift_testing_macros.py ----------*- python -*-
+#
+# This source file is part of the Swift.org open source project
+#
+# Copyright (c) 2024 Apple Inc. and the Swift project authors
+# Licensed under Apache License v2.0 with Runtime Library Exception
+#
+# See https://swift.org/LICENSE.txt for license information
+# See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+#
+# ----------------------------------------------------------------------------
+
+import os
+
+from build_swift.build_swift.versions import Version
+
+from . import cmake_product
+from . import product
+from . import swift
+
+
+class SwiftTestingMacros(product.Product):
+    @classmethod
+    def is_build_script_impl_product(cls):
+        return False
+
+    @classmethod
+    def is_before_build_script_impl_product(cls):
+        return False
+
+    @classmethod
+    def product_source_name(cls):
+        return "swift-testing/Sources/TestingMacros"
+
+    @classmethod
+    def get_dependencies(cls):
+        return [swift.Swift]
+
+    def should_build(self, host_target):
+        return True
+
+    def should_test(self, host_target):
+        return False
+
+    def should_install(self, host_target):
+        return self.args.install_swift_testing_macros
+
+    def _cmake_product(self, host_target):
+        build_root = os.path.dirname(self.build_dir)
+        build_dir = os.path.join(
+            build_root, '%s-%s' % (self.product_name(), host_target))
+
+        return SwiftTestingMacrosCMakeShim(
+            args=self.args,
+            toolchain=self.toolchain,
+            source_dir=self.source_dir,
+            build_dir=build_dir)
+
+    def _build_with_cmake(self, host_target):
+        self._cmake_product(host_target).build(host_target)
+
+    def build(self, host_target):
+        self._build_with_cmake(host_target)
+
+        # For Darwin host, 'build' is only called for the builder.
+        # Manually iterate the cross compile hosts.
+        if self.has_cross_compile_hosts() and self.is_darwin_host(host_target):
+            for target in self.args.cross_compile_hosts:
+                self._build_with_cmake(target)
+
+    def _install_with_cmake(self, host_target):
+        self._cmake_product(host_target).install(host_target)
+
+    def install(self, host_target):
+        self._install_with_cmake(host_target)
+
+        # For Darwin host, 'install' is only called for the builder.
+        # Manually iterate the cross compile hosts.
+        if self.has_cross_compile_hosts() and self.is_darwin_host(host_target):
+            for target in self.args.cross_compile_hosts:
+                self._install_with_cmake(target)
+
+
+class SwiftTestingMacrosCMakeShim(cmake_product.CMakeProduct):
+    def build(self, host_target):
+        override_deployment_version = None
+        if host_target.startswith('macosx'):
+            if Version(self.args.darwin_deployment_version_osx) < Version('10.15'):
+                override_deployment_version = '10.15'
+
+        # Use empty CMake install prefix, since the `DESTDIR` env var is set by
+        # `install_with_cmake` later which already has the same prefix.
+        self.cmake_options.define('CMAKE_INSTALL_PREFIX', '')
+
+        self.cmake_options.define('CMAKE_BUILD_TYPE', self.args.build_variant)
+
+        build_root = os.path.dirname(self.build_dir)
+        swift_build_dir = os.path.join(
+            '..', build_root, '%s-%s' % ('swift', host_target))
+        swift_cmake_dir = os.path.join(swift_build_dir, 'cmake', 'modules')
+        self.cmake_options.define('SwiftSyntax_DIR:PATH', swift_cmake_dir)
+
+        self.generate_toolchain_file_for_darwin_or_linux(
+            host_target, override_macos_deployment_version=override_deployment_version)
+        self.build_with_cmake([], self.args.build_variant, [],
+                              prefer_native_toolchain=True)
+
+    def install(self, host_target):
+        install_destdir = self.host_install_destdir(host_target)
+        install_prefix = install_destdir + self.args.install_prefix
+
+        self.install_with_cmake(['install'], install_prefix)
diff --git a/utils/swift_build_support/swift_build_support/products/swiftpm.py b/utils/swift_build_support/swift_build_support/products/swiftpm.py
index c9024e64bdaab..ea6e71d193ef2 100644
--- a/utils/swift_build_support/swift_build_support/products/swiftpm.py
+++ b/utils/swift_build_support/swift_build_support/products/swiftpm.py
@@ -21,6 +21,7 @@
 from . import llvm
 from . import product
 from . import swift
+from . import swift_testing
 from . import xctest
 from .. import shell
 from ..targets import StdlibDeploymentTarget
@@ -143,4 +144,5 @@ def get_dependencies(cls):
                 libdispatch.LibDispatch,
                 foundation.Foundation,
                 xctest.XCTest,
-                llbuild.LLBuild]
+                llbuild.LLBuild,
+                swift_testing.SwiftTesting]
diff --git a/utils/update_checkout/update-checkout-config.json b/utils/update_checkout/update-checkout-config.json
index fc7247acb86ba..feaac98246d51 100644
--- a/utils/update_checkout/update-checkout-config.json
+++ b/utils/update_checkout/update-checkout-config.json
@@ -34,6 +34,8 @@
             "remote": { "id": "apple/swift-system" } },
         "swift-stress-tester": {
             "remote": { "id": "swiftlang/swift-stress-tester" } },
+        "swift-testing": {
+            "remote": { "id": "swiftlang/swift-testing" } },
         "swift-corelibs-xctest": {
             "remote": { "id": "apple/swift-corelibs-xctest" } },
         "swift-corelibs-foundation": {
@@ -128,6 +130,7 @@
                 "swift-syntax": "main",
                 "swift-system": "1.3.0",
                 "swift-stress-tester": "main",
+                "swift-testing": "main",
                 "swift-corelibs-xctest": "main",
                 "swift-corelibs-foundation": "main",
                 "swift-foundation-icu": "main",
@@ -179,6 +182,7 @@
                 "swift-syntax": "release/6.0",
                 "swift-system": "1.3.0",
                 "swift-stress-tester": "release/6.0",
+                "swift-testing": "release/6.0",
                 "swift-corelibs-xctest": "release/6.0",
                 "swift-corelibs-foundation": "release/6.0",
                 "swift-foundation": "release/6.0",
@@ -230,6 +234,7 @@
                 "swift-syntax": "release/6.0.0",
                 "swift-system": "1.3.0",
                 "swift-stress-tester": "release/6.0.0",
+                "swift-testing": "release/6.0.0",
                 "swift-corelibs-xctest": "release/6.0.0",
                 "swift-corelibs-foundation": "release/6.0.0",
                 "swift-foundation": "release/6.0.0",
@@ -328,6 +333,7 @@
                 "swift-syntax": "main",
                 "swift-system": "1.3.0",
                 "swift-stress-tester": "main",
+                "swift-testing": "main",
                 "swift-corelibs-xctest": "main",
                 "swift-corelibs-foundation": "main",
                 "swift-corelibs-libdispatch": "main",
@@ -705,6 +711,7 @@
                 "swift-syntax": "main",
                 "swift-system": "1.3.0",
                 "swift-stress-tester": "main",
+                "swift-testing": "main",
                 "swift-corelibs-xctest": "main",
                 "swift-corelibs-foundation": "main",
                 "swift-corelibs-libdispatch": "main",