added test for swift hook

testing/resources/swift_hooks_repo/.gitignore

@@ -0,0 +1,4 @@
+.DS_Store
+/.build
+/Packages
+/*.xcodeproj

testing/resources/swift_hooks_repo/Package.swift

@@ -0,0 +1,5 @@
+import PackageDescription
+
+let package = Package(
+    name: "swift_hooks_repo"
+)

testing/resources/swift_hooks_repo/Sources/main.swift

@@ -0,0 +1 @@
+print("Hello, world!")

testing/resources/swift_hooks_repo/hooks.yaml

@@ -0,0 +1,6 @@
+-   id: swift-hooks-repo
+    name: Swift hooks repo example
+    description: Runs the hello world app generated by swift package init --type executable (binary called swift_hooks_repo here)
+    entry: swift_hooks_repo
+    language: swift
+    files: \.(swift)$

tests/repository_test.py

@@ -214,6 +214,14 @@ def test_system_hook_with_spaces(tempdir_factory, store):
     )
 
 
+@pytest.mark.integration
+def test_swift_hook(tempdir_factory, store):
+    _test_hook_repo(
+        tempdir_factory, store, 'swift_hooks_repo',
+        'swift-hooks-repo', [], b'Hello, world!\n',
+    )
+
+
 @pytest.mark.integration
 def test_missing_executable(tempdir_factory, store):
     _test_hook_repo(