test: Add module snapshot tests

Author: Techassi

crates/stackable-versioned-macros/fixtures/inputs/default/module.rs

@@ -0,0 +1,22 @@
+#[versioned(
+    version(name = "v1alpha1"),
+    version(name = "v1"),
+    version(name = "v2alpha1")
+)]
+// ---
+pub(crate) mod versioned {
+    pub struct Foo {
+        bar: usize,
+
+        #[versioned(added(since = "v1"))]
+        baz: bool,
+
+        #[versioned(deprecated(since = "v2alpha1"))]
+        deprecated_foo: String,
+    }
+
+    #[versioned]
+    pub struct Bar {
+        baz: String,
+    }
+}

crates/stackable-versioned-macros/fixtures/inputs/default/module_preserve.rs

@@ -0,0 +1,23 @@
+#[versioned(
+    version(name = "v1alpha1"),
+    version(name = "v1"),
+    version(name = "v2alpha1"),
+    preserve_module
+)]
+// ---
+pub(crate) mod versioned {
+    pub struct Foo {
+        bar: usize,
+
+        #[versioned(added(since = "v1"))]
+        baz: bool,
+
+        #[versioned(deprecated(since = "v2alpha1"))]
+        deprecated_foo: String,
+    }
+
+    #[versioned]
+    pub struct Bar {
+        baz: String,
+    }
+}