test/api: add build root integration check

Add a new test that checks the integration of API end points with
the `BuildRoot`.

test/mod/test_api.py

@@ -2,11 +2,15 @@
 # Test for API infrastructure
 #
 
+import pathlib
 import os
+import sys
 import tempfile
 import unittest
 
 import osbuild
+from osbuild.buildroot import BuildRoot
+from osbuild.monitor import NullMonitor
 from osbuild.util import jsoncomm
 
 
@@ -65,3 +69,27 @@ class TestAPI(unittest.TestCase):
             with self.assertRaises(AssertionError):
                 with api:
                     pass
+
+    def test_buildroot(self):
+        # Check API and BuildRoot integration: the runner will call
+        # api.setup_stdio and thus check that connecting to the api
+        # works correctly
+        runner = "org.osbuild.linux"
+        libdir = os.path.abspath(os.curdir)
+        var = pathlib.Path(self.tmp.name, "var")
+        var.mkdir()
+
+        monitor = NullMonitor(sys.stderr.fileno())
+        with BuildRoot("/", runner, libdir=libdir, var=var) as root:
+            api = osbuild.api.API({}, monitor)
+            root.register_api(api)
+
+            r = root.run(["/usr/bin/true"])
+            self.assertEqual(r.returncode, 0)
+
+            # Test we can use `.run` multiple times
+            r = root.run(["/usr/bin/true"])
+            self.assertEqual(r.returncode, 0)
+
+            r = root.run(["/usr/bin/false"])
+            self.assertNotEqual(r.returncode, 0)