1 files changed, 43 insertions, 0 deletions
diff --git a/src/test/java/com/google/devtools/common/options/OptionsDataTest.java b/src/test/java/com/google/devtools/common/options/OptionsDataTest.java
index ca777ed23e..d1f913197d 100644
--- a/src/test/java/com/google/devtools/common/options/OptionsDataTest.java
+++ b/src/test/java/com/google/devtools/common/options/OptionsDataTest.java
@@ -417,4 +417,47 @@ public class OptionsDataTest {
     assertThat(getOptionNames(data.getFieldsForClass(ReverseOrderedOptions.class)))
         .containsExactly("A", "B", "C").inOrder();
   }
+
+  /** Dummy options class. */
+  public static class InvalidExpansionOptions extends OptionsBase {
+    @Option(name = "foo", defaultValue = "1")
+    public int foo;
+
+    @Option(
+      name = "bar",
+      defaultValue = "1",
+      expansion = {"--foo=42"}
+    )
+    public int bar;
+  }
+
+  @Test
+  public void staticExpansionOptionsShouldNotHaveValues() {
+    try {
+      construct(InvalidExpansionOptions.class);
+      fail();
+    } catch (ConstructionException e) {
+      // Expected exception
+      assertThat(e).hasMessageThat().contains(
+          "Option bar is an expansion flag with a static expansion, but does not have Void type.");
+    }
+  }
+
+  /** Dummy options class. */
+  public static class ValidExpansionOptions extends OptionsBase {
+    @Option(name = "foo", defaultValue = "1")
+    public int foo;
+
+    @Option(
+      name = "bar",
+      defaultValue = "null",
+      expansion = {"--foo=42"}
+    )
+    public Void bar;
+  }
+
+  @Test
+  public void staticExpansionOptionsCanBeVoidType() {
+    construct(ValidExpansionOptions.class);
+  }
 }