sources: skip ostree tests if no ostree binary if found

This commit skips the ostree tests if no ostree binary is available.

sources/test/test_ostree_source.py

@@ -3,18 +3,23 @@
 import pathlib
 import tempfile
 
+import pytest
+
+from osbuild.testutil import has_executable
 from osbuild.testutil.net import http_serve_directory, https_serve_directory
 from osbuild.util import ostree
 
 SOURCES_NAME = "org.osbuild.ostree"
 
 
+@pytest.mark.skipif(not has_executable("ostree"), reason="need ostree")
 def test_ostree_source_not_exists(tmp_path, sources_service):
     checksum = "sha256:1111111111111111111111111111111111111111111111111111111111111111"
     sources_service.setup({"cache": tmp_path, "options": {}})
     assert not sources_service.exists(checksum, None)
 
 
+@pytest.mark.skipif(not has_executable("ostree"), reason="need ostree")
 def test_ostree_source_exists(tmp_path, sources_service):
     sources_service.setup({"cache": tmp_path, "options": {}})
     root = tmp_path / "org.osbuild.ostree" / "repo"
@@ -41,6 +46,7 @@ def make_repo(root):
         return ostree.cli("commit", f"--repo={root}", "--orphan", empty_tmpdir).stdout.rstrip()
 
 
+@pytest.mark.skipif(not has_executable("ostree"), reason="need ostree")
 def test_ostree_pull_plain(tmp_path, sources_service):
     fake_httpd_root = tmp_path / "fake-httpd-root"
     fake_httpd_root.mkdir(exist_ok=True)
@@ -53,6 +59,7 @@ def test_ostree_pull_plain(tmp_path, sources_service):
         assert sources_service.exists("sha256:" + fake_commit, None)
 
 
+@pytest.mark.skipif(not has_executable("ostree"), reason="need ostree")
 def test_ostree_pull_plain_mtls(tmp_path, sources_service, monkeypatch):
     fake_httpd_root = tmp_path / "fake-httpd-root"
     fake_httpd_root.mkdir(exist_ok=True)