Run migration tests via ./runtests

.travis.yml

@@ -31,10 +31,6 @@ matrix:
 before_script:
 - go get github.com/urfave/gfmxr/...
 - $pip_install flake8
-- mkdir -p .extracted-examples
-- curl -sSL -o .extracted-examples/README.md
-    'https://raw.githubusercontent.com/urfave/cli/v1/README.md'
-- pushd .extracted-examples && gfmxr extract -o . ; popd
 
 script:
 - flake8 runtests cli-v1-to-v2
@@ -42,9 +38,4 @@ script:
 - ./runtests test
 - ./runtests gfmxr
 - ./cli-v1-to-v2 --selftest
-- for f in .extracted-examples/*.go ; do
-    ./cli-v1-to-v2 -w $f ;
-    go build -o .extracted-examples/example $f ;
-    ./cli-v1-to-v2 -w $f ;
-    go build -o .extracted-examples/example $f ;
-  done
+- ./runtests migrations

appveyor.yml

@@ -24,3 +24,4 @@ build_script:
 - python runtests test
 - python runtests gfmxr
 - python cli-v1-to-v2 --selftest
+- python runtests migrations

runtests

@@ -2,7 +2,9 @@
 from __future__ import print_function
 
 import argparse
+import glob
 import os
+import shutil
 import sys
 import tempfile
 
@@ -65,6 +67,30 @@ def _vet():
     _run('go vet ./...'.split())
 
 
+@_target
+def _migrations():
+    migration_script = os.path.abspath(
+        os.environ.get('V1TOV2', './cli-v1-to-v2')
+    )
+    v1_readme_url = os.environ.get(
+        'V1README',
+        'https://raw.githubusercontent.com/urfave/cli/v1/README.md'
+    )
+
+    tmpdir = tempfile.mkdtemp()
+    try:
+        os.chdir(tmpdir)
+        _run('curl -sSL -o README.md {}'.format(v1_readme_url).split())
+        _run('gfmxr extract -o .'.split())
+
+        for gofile in glob.glob('*.go'):
+            for i in (0, 1):
+                _run(['python', migration_script, '-w', gofile])
+                _run('go build -o tmp.out {}'.format(gofile).split())
+    finally:
+        shutil.rmtree(tmpdir, ignore_errors=True)
+
+
 def _run(command):
     print('runtests: {}'.format(' '.join(command)), file=sys.stderr)
     check_call(command)