1 files changed, 85 insertions, 0 deletions
diff --git a/tests/test_alternatives.py b/tests/test_alternatives.py
new file mode 100644
index 0000000..2a42d69
--- /dev/null
+++ b/tests/test_alternatives.py
@@ -0,0 +1,85 @@
+import textwrap
+from typing import Mapping
+
+from debputy.maintscript_snippet import MaintscriptSnippetContainer
+from debputy.packager_provided_files import PackagerProvidedFile
+from debputy.packages import BinaryPackage
+from debputy.packaging.alternatives import process_alternatives
+from debputy.plugin.api import virtual_path_def, VirtualPath
+from debputy.plugin.api.impl import plugin_metadata_for_debputys_own_plugin
+from debputy.plugin.api.impl_types import PackagerProvidedFileClassSpec
+from debputy.plugin.api.test_api import build_virtual_file_system
+
+
+def _ppf_for(pkg: BinaryPackage, path: VirtualPath) -> PackagerProvidedFile:
+    plugin_metadata = plugin_metadata_for_debputys_own_plugin()
+    return PackagerProvidedFile(
+        path,
+        pkg.name,
+        "irrelevant",
+        "irrelevant",
+        PackagerProvidedFileClassSpec(
+            plugin_metadata,
+            "alternatives",
+            "DEBIAN/alternatives",
+            0o0644,
+            None,
+            False,
+            False,
+            None,
+            False,
+            True,
+            None,
+            None,
+            False,
+        ),
+    )
+
+
+def test_alternatives(
+    package_single_foo_arch_all_cxt_amd64: Mapping[str, BinaryPackage],
+) -> None:
+    pkg = package_single_foo_arch_all_cxt_amd64["foo"]
+    debian_dir = build_virtual_file_system(
+        [
+            virtual_path_def(
+                "alternatives",
+                fs_path="debian/alternatives",
+                content=textwrap.dedent(
+                    """\
+        Name: x-terminal-emulator
+        Link: /usr/bin/x-terminal-emulator
+        Alternative: /usr/bin/xterm
+        Dependents:
+          /usr/share/man/man1/x-terminal-emulator.1.gz x-terminal-emulator.1.gz /usr/share/man/man1/xterm.1.gz
+        Priority: 20
+        """
+                ),
+            ),
+        ]
+    )
+    fs_root = build_virtual_file_system(
+        [
+            "./usr/bin/xterm",
+            "./usr/share/man/man1/xterm.1.gz",
+        ]
+    )
+    reserved_ppfs = {"alternatives": [_ppf_for(pkg, debian_dir["alternatives"])]}
+    maintscript_snippets = {
+        "prerm": MaintscriptSnippetContainer(),
+        "postinst": MaintscriptSnippetContainer(),
+    }
+    process_alternatives(
+        pkg,
+        fs_root,
+        reserved_ppfs,
+        maintscript_snippets,
+    )
+
+    prerm = maintscript_snippets["prerm"].generate_snippet(reverse=True)
+    postinst = maintscript_snippets["postinst"].generate_snippet(reverse=True)
+
+    assert "--remove x-terminal-emulator /usr/bin/xterm" in prerm
+    assert (
+        "--install /usr/bin/x-terminal-emulator x-terminal-emulator /usr/bin/xterm 20"
+    ) in postinst