Add a test with -emit-imported-module

Author: elsh

test/Frontend/module-alias-emit-imported-modules.swift

@@ -0,0 +1,37 @@
+/// Test -emit-imported-modules with module aliasing.
+///
+
+// RUN: %empty-directory(%t)
+// RUN: %{python} %utils/split_file.py -o %t %s
+
+/// Create AppleLogging.swiftmodule by aliasing XLogging
+// RUN: %target-swift-frontend -module-name AppleLogging -module-alias XLogging=AppleLogging %t/FileLogging.swift -emit-module -emit-module-path %t/AppleLogging.swiftmodule
+// RUN: test -f %t/AppleLogging.swiftmodule
+
+/// Verify emitted imported modules contains AppleLogging as a module name
+// RUN: %target-swift-frontend -emit-imported-modules %t/FileLib.swift -module-alias XLogging=AppleLogging -I %t > %t/result.output
+
+// RUN: %FileCheck %s -input-file %t/result.output -check-prefix CHECK-AST
+// CHECK-AST: AppleLogging
+// RUN: not %FileCheck %s -input-file %t/result.output -check-prefix CHECK-NOT-AST
+// CHECK-NOT-AST: XLogging
+
+
+// BEGIN FileLogging.swift
+public struct Logger {
+  public init() {}
+}
+public func setup() -> XLogging.Logger? {
+  return Logger()
+}
+
+// BEGIN FileLib.swift
+import XLogging
+
+public func start() -> XLogging.Logger? {
+  return XLogging.setup()
+}
+
+public func end(_ arg: XLogging.Logger) {
+}
+