diff --git a/posix/BUILD b/posix/BUILD
index 77c780e..69ee1bf 100644
--- a/posix/BUILD
+++ b/posix/BUILD
@@ -12,10 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-Alias('posix', 'posix/ueforth')
 Importation('gen/posix_boot.h', '$src/posix/posix_boot.fs', name='boot')
 Compile('posix/ueforth', '$src/posix/main.c',
         implicit=['gen/posix_boot.h'])
 
+Alias('posix', ' '.join([
+  ForthTest('tests/posix_all_tests.out', 'posix/ueforth', '$src/common/all_tests.fs'),
+]))
+
 OneShot('install', 'sudo cp posix/ueforth /usr/bin/ueforth',
         'posix/ueforth', pool='console')
diff --git a/tools/configure.py b/tools/configure.py
index eda5a28..5a8d6a6 100755
--- a/tools/configure.py
+++ b/tools/configure.py
@@ -222,6 +222,12 @@ rule oneshot
   description = ONESHOT
   command = echo oneshot
 
+rule forth_test
+  description = FORTH_TEST
+  depfile = $out.d
+  deps = gcc
+  command = $src/tools/importation.py -i $test -o $out --depsout $depfile --no-out && $interp $forth $test >$out
+
 rule clean
   description = CLEAN
   command = ninja -t clean
@@ -355,6 +361,17 @@ def OneShot(target, command, source, pool=None):
   return target
 
 
+def ForthTest(target, forth, test, interp='', pool=None):
+  global output
+  output += f'build {target}: forth_test {forth} {test}\n'
+  output += f'  forth = {forth}\n'
+  output += f'  test = {test}\n'
+  output += f'  interp = {interp}\n'
+  if pool:
+    output += f'  pool = {pool}\n'
+  return target
+
+
 def Default(target):
   global output
   output += f'default {target}\n'
diff --git a/windows/BUILD b/windows/BUILD
index f9061c7..e9ef4c1 100644
--- a/windows/BUILD
+++ b/windows/BUILD
@@ -21,14 +21,20 @@ Importation('gen/windows_boot_extra.h', '$src/windows/windows_boot_extra.fs',
             header_mode='win', name='boot_extra')
 
 # Compile Win32.
-Alias('win32', 'windows/uEf32.exe')
+Alias('win32', ' '.join([
+  ForthTest('tests/win32_all_tests.out', 'windows/uEf32.exe', '$src/common/all_tests.fs',
+            interp='wine', pool='console'),
+]))
 CompileW32('windows/uEf32.obj', '$src/windows/main.c',
            implicit=['gen/windows_boot.h', 'gen/windows_boot_extra.h'])
 LinkW32('windows/uEf32.exe',
         ' '.join(['windows/uEf32.obj', 'resources/ueforth_res32.res']))
 
 # Compile Win64.
-Alias('win64', 'windows/uEf64.exe')
+Alias('win64', ' '.join([
+  ForthTest('tests/win64_all_tests.out', 'windows/uEf64.exe', '$src/common/all_tests.fs',
+            interp='wine', pool='console'),
+]))
 CompileW64('windows/uEf64.obj', '$src/windows/main.c',
            implicit=['gen/windows_boot.h', 'gen/windows_boot_extra.h'])
 LinkW64('windows/uEf64.exe',