Add generate_package fixture

This fixture fakes a pacman package for example required for pyalpm to
test Handle.load_pkg.

pytest_pacman/plugin.py

@@ -7,6 +7,19 @@ import tarfile
 import pytest
 
 
+def generate_pkginfo(data):
+    pkginfo = ''
+
+    for key, value in data.items():
+        if not isinstance(value, list):
+            value = [value]
+
+        for val in value:
+            pkginfo += f'{key} = {val}\n'
+
+    return pkginfo
+
+
 def generate_desc(pkg):
     '''
     '''
@@ -114,3 +127,33 @@ def generate_localdb(tmpdir_factory):
         return dbroot
 
     return _generate_localdb
+
+
+@pytest.fixture(scope="session")
+def generate_package(tmpdir_factory):
+    '''Generates a package in provided location or when not provided pytest tmpdir
+
+    Parameters:
+    data (object): a dict containing the fields for PKGINFO
+    pkgname (string): the package file name ($pkgname-$pkgver-$pkgrel.pkg.tar)
+    pkgpath (string): the path to save the pkg file
+
+    Returns:
+    str: path to package
+    '''
+
+    def _generate_package(data, pkgname='test.pkg.tar', pkgpath=''):
+        if not pkgpath:
+            pkgpath = str(tmpdir_factory.mktemp('pkgpath').join(pkgname))
+        else:
+            pkgpath = os.path.join(pkgpath, pkgname)
+
+        tar = tarfile.open(pkgpath, 'w')
+        info = tarfile.TarInfo('.PKGINFO')
+        data = generate_pkginfo(data)
+        info.size = len(data)
+        tar.addfile(info, io.BytesIO(data.encode()))
+
+        return pkgpath
+
+    return _generate_package

test/package.json

+{
+    "pkgname": "filesystem",
+    "pkgbase": "filesystem",
+    "pkgver": "1-1",
+    "pkgdesc": "filesystem",
+    "url": "https://archlinux.org",
+    "builddate": 1599085821,
+    "packager": "Test <test@archlinux.org>",
+    "arch": "x86_64",
+    "license": "GPL",
+    "depend": [
+        "iana-etc",
+        "vi"
+    ]
+}

test/test_fixtures.py

@@ -39,6 +39,17 @@ def syncdb_tmpdir(tmpdir_factory, core_data, generate_syncdb):
     return generate_syncdb(core_data, 'foo.db', dbpath)
 
 
+@pytest.fixture(scope="session")
+def pkg_data():
+    curpath = os.path.dirname(os.path.realpath(__file__))
+    return json.load(open(f'{curpath}/package.json'))
+
+
+@pytest.fixture
+def package(pkg_data, generate_package):
+    return generate_package(pkg_data)
+
+
 def test_localdb(core_data, localdb):
     pkg = core_data[0]
     pkgpath = f"{localdb}/local/{pkg['name']}-{pkg['version']}"
@@ -75,3 +86,9 @@ def test_syncdb_tmpdir(core_data, syncdb_tmpdir):
             pkgpath = f"{pkg['name']}-{pkg['version']}"
 
             assert tarinfo.name == f"{pkgpath}/desc"
+
+
+def test_package(pkg_data, package):
+    with tarfile.open(package) as tar:
+        for index, tarinfo in enumerate(tar):
+            assert tarinfo.name == '.PKGINFO'