diff --git a/src/test/java/com/google/devtools/build/lib/skylark/SkylarkAspectsTest.java b/src/test/java/com/google/devtools/build/lib/skylark/SkylarkAspectsTest.java
index 0872174..47b4a98 100644
--- a/src/test/java/com/google/devtools/build/lib/skylark/SkylarkAspectsTest.java
+++ b/src/test/java/com/google/devtools/build/lib/skylark/SkylarkAspectsTest.java
@@ -1052,7 +1052,7 @@
   }
 
   @Test
-  public void multipleExecutablesInTarget() throws Exception {
+  public void testMultipleExecutablesInTarget() throws Exception {
     scratch.file("foo/extension.bzl",
         "def _aspect_impl(target, ctx):",
         "   return struct()",
@@ -1061,8 +1061,8 @@
         "   pass",
         "my_rule = rule(_main_rule_impl,",
         "   attrs = { ",
-        "      'exe1' : attr.label(executable = True, allow_files = True),",
-        "      'exe2' : attr.label(executable = True, allow_files = True),",
+        "      'exe1' : attr.label(executable = True, allow_files = True, cfg = 'host'),",
+        "      'exe2' : attr.label(executable = True, allow_files = True, cfg = 'host'),",
         "   },",
         ")"
     );
@@ -1081,7 +1081,6 @@
     assertThat(analysisResultOfAspect.hasError()).isFalse();
   }
 
-
   @Test
   public void aspectFragmentAccessSuccess() throws Exception {
     getConfiguredTargetForAspectFragment(
@@ -1251,7 +1250,6 @@
     };
   }
 
-
   @Test
   public void aspectOutputsToBinDirectory() throws Exception {
     scratch.file(
diff --git a/src/test/java/com/google/devtools/build/lib/skylark/SkylarkRuleClassFunctionsTest.java b/src/test/java/com/google/devtools/build/lib/skylark/SkylarkRuleClassFunctionsTest.java
index 8c6df5b..da072b9 100644
--- a/src/test/java/com/google/devtools/build/lib/skylark/SkylarkRuleClassFunctionsTest.java
+++ b/src/test/java/com/google/devtools/build/lib/skylark/SkylarkRuleClassFunctionsTest.java
@@ -56,7 +56,9 @@
 import java.util.Collection;
 import org.junit.Assert;
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
+import org.junit.rules.ExpectedException;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
 
@@ -65,6 +67,7 @@
  */
 @RunWith(JUnit4.class)
 public class SkylarkRuleClassFunctionsTest extends SkylarkTestCase {
+  @Rule public ExpectedException thrown = ExpectedException.none();
 
   @Before
   public final void createBuildFile() throws Exception  {
@@ -1083,6 +1086,7 @@
   }
 
   @Test
+
   public void structsAsDeclaredProvidersTest() throws Exception {
     evalAndExport(
         "data = struct(x = 1)"
@@ -1115,4 +1119,30 @@
         "   pass",
         "aspect(_impl, attr_aspects=['*', 'foo'])");
   }
+
+  @Test
+  public void testMandatoryConfigParameterForExecutableLabels() throws Exception {
+    scratch.file("third_party/foo/extension.bzl",
+      "def _main_rule_impl(ctx):",
+      "    pass",
+      "my_rule = rule(_main_rule_impl,",
+      "    attrs = { ",
+      "        'exe' : attr.label(executable = True, allow_files = True),",
+      "    },",
+      ")"
+    );
+    scratch.file("third_party/foo/BUILD",
+      "load('extension',  'my_rule')",
+      "my_rule(name = 'main', exe = ':tool.sh')"
+    );
+
+    try {
+      createRuleContext("//third_party/foo:main");
+      Assert.fail();
+    } catch (AssertionError e) {
+      assertThat(e.getMessage()).contains("cfg parameter is mandatory when executable=True is "
+          + "provided.");
+    }
+  }
 }
+