Enable @testable import in swift_library

* Debug and fastbuild compilation modes now pass -enable-testing flag enabling internal symbol imports in test code.

--
MOS_MIGRATED_REVID=126925229

2 files changed, 13 insertions, 4 deletions

diff --git a/src/test/shell/bazel/bazel_apple_test.sh b/src/test/shell/bazel/bazel_apple_test.sh
index efa81ffa57..6eb6ca265a 100755
--- a/src/test/shell/bazel/bazel_apple_test.sh
+++ b/src/test/shell/bazel/bazel_apple_test.sh
@@ -391,11 +391,19 @@ EOF
 function test_swift_tests() {
   make_app
 
+  cat >ios/internal.swift <<EOF
+internal class InternalClass {
+  func foo() -> String { return "bar" }
+}
+EOF
+
   cat >ios/tests.swift <<EOF
   import XCTest
+  @testable import ios_SwiftMain
 
 class FooTest: XCTestCase {
   func testFoo() { XCTAssertEqual(2, 3) }
+  func testInternalClass() { XCTAssertEqual(InternalClass().foo(), "bar") }
 }
 EOF
 
@@ -403,7 +411,7 @@ EOF
 load("//tools/build_defs/apple:swift.bzl", "swift_library")
 
 swift_library(name = "SwiftMain",
-              srcs = ["app.swift"])
+              srcs = ["app.swift", "internal.swift"])
 
 objc_binary(name = "bin",
             srcs = ["//tools/objc:dummy.c"],
@@ -414,7 +422,8 @@ ios_application(name = "app",
                 infoplist = 'App-Info.plist')
 
 swift_library(name = "SwiftTest",
-              srcs = ["tests.swift"])
+              srcs = ["tests.swift"],
+              deps = [":SwiftMain"])
 
 ios_test(name = "app_test",
          srcs = ["//tools/objc:dummy.c"],
diff --git a/tools/build_defs/apple/swift.bzl b/tools/build_defs/apple/swift.bzl
index 7df084208b..42cf00d18c 100644
--- a/tools/build_defs/apple/swift.bzl
+++ b/tools/build_defs/apple/swift.bzl
@@ -37,9 +37,9 @@ def _swift_compilation_mode_flags(ctx):
   """Returns additional swiftc flags for the current compilation mode."""
   mode = ctx.var["COMPILATION_MODE"]
   if mode == "dbg":
-    return ["-Onone", "-DDEBUG", "-g"]
+    return ["-Onone", "-DDEBUG", "-g", "-enable-testing"]
   elif mode == "fastbuild":
-    return ["-Onone", "-DDEBUG"]
+    return ["-Onone", "-DDEBUG", "-enable-testing"]
   elif mode == "opt":
     return ["-O", "-DNDEBUG"]