test-wrapper: add empty impl + Bazel flag

This commit adds:

- the skeleton implementation of the Windows
  native test wrapper

- a depenency on the native test wrapper from test
  rules, through the new $test_wrapper rule
  attribute

- the --windows_native_test_wrapper Bazel flag,
  which is currently a no-op

See https://github.com/bazelbuild/bazel/issues/5508

Change-Id: I8df95c8ce8bab53c51c257698ec95416065a836e

Closes #5854.

Change-Id: I2ffc78bceec5dd867af775b5878f105fa87c3dba
PiperOrigin-RevId: 208650699

3 files changed, 31 insertions, 0 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/analysis/BaseRuleClasses.java b/src/main/java/com/google/devtools/build/lib/analysis/BaseRuleClasses.java
index 2bd7daf1b9..d75f64a566 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/BaseRuleClasses.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/BaseRuleClasses.java
@@ -166,6 +166,11 @@ public class BaseRuleClasses {
           .add(attr("args", STRING_LIST))
           // Input files for every test action
           .add(
+              attr("$test_wrapper", LABEL)
+                  .cfg(HostTransition.INSTANCE)
+                  .singleArtifact()
+                  .value(env.getToolsLabel("//tools/test:test_wrapper")))
+          .add(
               attr("$test_runtime", LABEL_LIST)
                   .cfg(HostTransition.INSTANCE)
                   .value(ImmutableList.of(env.getToolsLabel("//tools/test:runtime"))))
diff --git a/src/main/java/com/google/devtools/build/lib/analysis/skylark/SkylarkRuleClassFunctions.java b/src/main/java/com/google/devtools/build/lib/analysis/skylark/SkylarkRuleClassFunctions.java
index fffbe7a5ea..4a99825d6d 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/skylark/SkylarkRuleClassFunctions.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/skylark/SkylarkRuleClassFunctions.java
@@ -166,6 +166,11 @@ public class SkylarkRuleClassFunctions implements SkylarkRuleFunctionsApi<Artifa
         .add(attr("args", STRING_LIST))
         // Input files for every test action
         .add(
+            attr("$test_wrapper", LABEL)
+                .cfg(HostTransition.INSTANCE)
+                .singleArtifact()
+                .value(labelCache.getUnchecked(toolsRepository + "//tools/test:test_wrapper")))
+        .add(
             attr("$test_runtime", LABEL_LIST)
                 .cfg(HostTransition.INSTANCE)
                 .value(
diff --git a/src/main/java/com/google/devtools/build/lib/analysis/test/TestConfiguration.java b/src/main/java/com/google/devtools/build/lib/analysis/test/TestConfiguration.java
index 0d2f85b1cb..fe60cc1f39 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/test/TestConfiguration.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/test/TestConfiguration.java
@@ -216,6 +216,23 @@ public class TestConfiguration extends Fragment {
     )
     public Label coverageReportGenerator;
 
+    @Option(
+        name = "windows_native_test_wrapper",
+        // Undocumented: this features is under development and not yet ready for production use.
+        // We define the flag to be able to test the feature.
+        // Design:
+        // https://github.com/laszlocsomor/proposals/blob/win-test-runner/designs/2018-07-18-windows-native-test-runner.md
+        documentationCategory = OptionDocumentationCategory.UNDOCUMENTED,
+        // Affects loading and analysis: this flag affects which target Bazel loads and creates test
+        // actions with on Windows.
+        effectTags = {OptionEffectTag.LOADING_AND_ANALYSIS},
+        defaultValue = "false",
+        help =
+            "Do not use yet, this flag's functionality is not yet implemented. "
+                + "(On Windows: if true, uses the C++ test wrapper to run tests, otherwise uses "
+                + "tools/test/test-setup.sh as on other platforms. On other platforms: no-op.)")
+    public boolean windowsNativeTestWrapper;
+
     @Override
     public Map<String, Set<Label>> getDefaultsLabels() {
       return ImmutableMap.<String, Set<Label>>of(
@@ -298,6 +315,10 @@ public class TestConfiguration extends Fragment {
     return options.coverageReportGenerator;
   }
 
+  public boolean isUsingWindowsNativeTestWrapper() {
+    return options.windowsNativeTestWrapper;
+  }
+
   /**
    * @return number of times the given test should run. If the test doesn't match any of the
    *     filters, runs it once.