[Macros] Add test for macro expansion printing

* Macro expanded member decls in .swiftinterface (rdar://117374821)
* cursor-info on a decl with peer macro attribute (rdar://117374966)

(cherry picked from commit 55144fb)

Author: rintaro

test/Macros/Inputs/syntax_macro_definitions.swift

@@ -1900,7 +1900,7 @@ public struct AddPeerStoredPropertyMacro: PeerMacro, Sendable {
     return [
       """
 
-      private var _foo: Int = 100
+      public var _foo: Int = 100
       """
     ]
   }

test/ModuleInterface/macros.swift

@@ -64,8 +64,35 @@ macro structWithUnqualifiedLookup() = #externalMacro(module: "MacroDefinition",
 
 let world = 17
 
-// CHECK-NOT: structWithUnqualifiedLookup
 public
 #structWithUnqualifiedLookup
-
+// CHECK-NOT: structWithUnqualifiedLookup
+// CHECK-NOT: struct StructWithUnqualifiedLookup
 // CHECK: struct StructWithUnqualifiedLookup
+// CHECK-NOT: struct StructWithUnqualifiedLookup
+
+@attached(peer, names: named(_foo))
+macro AddPeerStoredProperty() = #externalMacro(module: "MacroDefinition", type: "AddPeerStoredPropertyMacro")
+
+@AddPeerStoredProperty
+public var test: Int = 10
+// CHECK: var test
+// CHECK-NOT: var _foo
+// CHECK: var _foo
+// CHECK-NOT: var _foo
+
+// CHECK: struct TestStruct {
+public struct TestStruct {
+  public #structWithUnqualifiedLookup
+  // CHECK-NOT: structWithUnqualifiedLookup
+  // CHECK-NOT: struct StructWithUnqualifiedLookup
+  // CHECK: struct StructWithUnqualifiedLookup
+  // CHECK-NOT: struct StructWithUnqualifiedLookup
+
+  @AddPeerStoredProperty
+  public var test: Int = 10
+  // CHECK: var test
+  // CHECK-NOT: var _foo
+  // CHECK: var _foo
+  // CHECK-NOT: var _foo
+}

test/SourceKit/Macros/macro_basic.swift

@@ -60,6 +60,13 @@ macro anonymousTypes(_: () -> String) = #externalMacro(module: "MacroDefinition"
 @freestanding(expression) macro assert(_: String) = #externalMacro(module: "MacroDefinition", type: "AssertMacro")
 #assert("foobar")
 
+@attached(peer, names: named(_foo))
+macro AddPeerStoredProperty() = #externalMacro(module: "MacroDefinition", type: "AddPeerStoredPropertyMacro")
+struct S5 {
+  @AddPeerStoredProperty
+  var test: Int = 10
+}
+
 // REQUIRES: swift_swift_parser, executable_test, shell
 
 // RUN: %empty-directory(%t)
@@ -281,3 +288,8 @@ macro anonymousTypes(_: () -> String) = #externalMacro(module: "MacroDefinition"
 //##-- Expansion on "fails to typecheck" macro expression
 // RUN: %sourcekitd-test -req=refactoring.expand.macro -pos=61:2 %s -- ${COMPILER_ARGS[@]} | %FileCheck -check-prefix=ERRONEOUS_EXPAND %s
 // ERRONEOUS_EXPAND: 61:1-61:18 (@__swiftmacro_{{.+}}.swift) "assert("foobar")"
+
+//##-- Cursor-info on a decl where a peer macro attached.
+// RUN: %sourcekitd-test -req=cursor -pos=67:7 %s -- ${COMPILER_ARGS[@]} | %FileCheck -check-prefix=CURSOR_ON_DECL_WITH_PEER %s
+// CURSOR_ON_DECL_WITH_PEER: <decl.var.instance><syntaxtype.keyword>var</syntaxtype.keyword> <decl.name>test</decl.name>: <decl.var.type><ref.struct usr="s:Si">Int</ref.struct></decl.var.type></decl.var.instance>
+// CURSOR_ON_DECL_WITH_PEER-NOT: _foo