Add some tests for swift-testing based output

test/fixtures/xctest_runner/BUILD

@@ -70,3 +70,21 @@ swift_test(
     tags = FIXTURE_TAGS,
     deps = [":MainLibrary"],
 )
+
+swift_test(
+    name = "FailingSwiftTestingTests",
+    srcs = ["FailingSwiftTestingTests.swift"],
+    tags = FIXTURE_TAGS,
+)
+
+swift_test(
+    name = "EmptySwiftTestingSuite",
+    srcs = ["EmptySwiftTestingSuite.swift"],
+    tags = FIXTURE_TAGS,
+)
+
+swift_test(
+    name = "PassingSwiftTestingTests",
+    srcs = ["PassingSwiftTestingTests.swift"],
+    tags = FIXTURE_TAGS,
+)

test/fixtures/xctest_runner/EmptySwiftTestingSuite.swift

@@ -0,0 +1,6 @@
+import Testing
+
+@Suite("Empty test suite")
+class EmptyTestSuite {
+
+}

test/fixtures/xctest_runner/FailingSwiftTestingTests.swift

@@ -0,0 +1,6 @@
+import Testing
+
+@Test("A failing test")
+func aFalingTest(){
+  #expect(false, "This assertion will always fail")
+}

test/fixtures/xctest_runner/PassingSwiftTestingTests.swift

@@ -0,0 +1,6 @@
+import Testing
+
+@Test("A passing test")
+func aPassingTest(){
+  #expect(true, "This assertion should pass")
+}

test/rules/swift_shell_runner.sh.template

@@ -31,7 +31,7 @@ set -euxo pipefail
 executable="%executable%"
 expected_return_code="%expected_return_code%"
 expected_logs=%expected_logs%
-not_expected_logs=%expected_logs%
+not_expected_logs=%not_expected_logs%
 
 # execute the target under test while recording its outputs and return code
 tmp_dir=$(mktemp -d)
@@ -59,7 +59,7 @@ done
 # verify the absence of unexpected logs
 for unexpected in "${not_expected_logs[@]}"
 do
-  if ! grep --quiet --invert-match --regexp "$unexpected" "$testlog"; then
+  if grep --quiet --regexp "$unexpected" "$testlog"; then
     echo "Fail: found unexpected log: $unexpected"
     exit 1
   fi

test/xctest_runner_tests.bzl

@@ -2,6 +2,8 @@
 
 load("//test/rules:swift_shell_test.bzl", "swift_shell_test")
 
+_NO_TESTS_DISCOVERED = "ERROR: No tests were discovered"
+
 def xctest_runner_test_suite(name, tags = []):
     """Test suite for xctest runner.
 
@@ -19,6 +21,7 @@ def xctest_runner_test_suite(name, tags = []):
             "Test Suite 'PassingUnitTests.xctest' passed",
             "Executed 3 tests, with 0 failures",
         ],
+        not_expected_logs = [_NO_TESTS_DISCOVERED],
         tags = all_tags,
         target_under_test = "//test/fixtures/xctest_runner:PassingUnitTests",
         target_compatible_with = ["@platforms//os:macos"],
@@ -32,6 +35,7 @@ def xctest_runner_test_suite(name, tags = []):
             "Test Suite 'FailingUnitTests.xctest' failed",
             "Executed 1 test, with 1 failure",
         ],
+        not_expected_logs = [_NO_TESTS_DISCOVERED],
         tags = all_tags,
         target_under_test = "//test/fixtures/xctest_runner:FailingUnitTests",
         target_compatible_with = ["@platforms//os:macos"],
@@ -42,13 +46,46 @@ def xctest_runner_test_suite(name, tags = []):
         expected_return_code = 1,
         expected_logs = [
             "Executed 0 tests, with 0 failures",
-            "ERROR: No tests were discovered",
+            _NO_TESTS_DISCOVERED,
         ],
         tags = all_tags,
         target_under_test = "//test/fixtures/xctest_runner:EmptyUnitTests",
         target_compatible_with = ["@platforms//os:macos"],
     )
 
+    swift_shell_test(
+        name = "{}_swift_testing_no_tests".format(name),
+        expected_return_code = 1,
+        expected_logs = [
+            "Test run with 0 tests.* passed after",
+            _NO_TESTS_DISCOVERED,
+        ],
+        tags = all_tags,
+        target_under_test = "//test/fixtures/xctest_runner:EmptySwiftTestingSuite",
+    )
+
+    swift_shell_test(
+        name = "{}_swift_testing_pass".format(name),
+        expected_return_code = 0,
+        expected_logs = [
+            "Test run with 1 test.* passed after",
+        ],
+        not_expected_logs = [_NO_TESTS_DISCOVERED],
+        tags = all_tags,
+        target_under_test = "//test/fixtures/xctest_runner:PassingSwiftTestingTests",
+    )
+
+    swift_shell_test(
+        name = "{}_swift_testing_fail".format(name),
+        expected_return_code = 1,
+        expected_logs = [
+            "Test run with 1 test.* failed after",
+        ],
+        not_expected_logs = [_NO_TESTS_DISCOVERED],
+        tags = all_tags,
+        target_under_test = "//test/fixtures/xctest_runner:FailingSwiftTestingTests",
+    )
+
     native.test_suite(
         name = name,
         tags = all_tags,