Merge pull request swiftlang#31050 from bitjammer/acgarland/rdar-61843516-add-additional-test

[SymbolGraph] Add additional filtering test NFC

Author: bitjammer

test/SymbolGraph/Relationships/ConformsTo/FilterImplicitlyPrivate.swift

@@ -0,0 +1,50 @@
+// RUN: %empty-directory(%t)
+// RUN: %target-build-swift %s -module-name FilterImplicitlyPrivate -emit-module -emit-module-path %t/
+// RUN: %target-swift-symbolgraph-extract -module-name FilterImplicitlyPrivate -I %t -pretty-print -output-dir %t
+// RUN: %FileCheck %s --input-file %t/FilterImplicitlyPrivate.symbols.json
+
+// Make sure extensions on implicitly private (< public or underscored, or inside one of those)
+// don't emit relationships (or symbols)
+
+struct Internal {}
+
+extension Internal: CustomDebugStringConvertible {
+  var debugDescription: String {
+    return ""
+  }
+}
+
+public struct _PublicUnderscored {}
+
+extension _PublicUnderscored: CustomDebugStringConvertible {
+  public var debugDescription: String {
+    return ""
+  }
+}
+
+extension _PublicUnderscored {
+  public struct PublicInner {}
+  public struct _PublicUnderscoredInner {}
+  struct InternalInner {}
+}
+
+extension _PublicUnderscored.PublicInner: CustomDebugStringConvertible {
+  public var debugDescription: String {
+    return ""
+  }
+}
+
+extension _PublicUnderscored._PublicUnderscoredInner: CustomDebugStringConvertible {
+  public var debugDescription: String {
+    return ""
+  }
+}
+
+extension _PublicUnderscored.InternalInner: CustomDebugStringConvertible {
+  public var debugDescription: String {
+    return ""
+  }
+}
+
+// CHECK: "symbols": []
+// CHECK: "relationships": []