add override_apex to version_variant test

Bug: 285138555
Test: go test ./apex
Change-Id: I973156325cc396eb6d32be3d08ea6154b722d925
diff --git a/apex/apex_test.go b/apex/apex_test.go
index df138e0..ecb7e21 100644
--- a/apex/apex_test.go
+++ b/apex/apex_test.go
@@ -6790,6 +6790,10 @@
 			public_key: "testkey.avbpubkey",
 			private_key: "testkey.pem",
 		}
+		override_apex {
+			name: "myoverrideapex",
+			base: "bar",
+		}
 	`)
 
 	fooManifestRule := result.ModuleForTests("foo", "android_common_foo_image").Rule("apexManifestRule")
@@ -6806,6 +6810,12 @@
 	if barActualDefaultVersion != barExpectedDefaultVersion {
 		t.Errorf("expected to find defaultVersion %q; got %q", barExpectedDefaultVersion, barActualDefaultVersion)
 	}
+
+	overrideBarManifestRule := result.ModuleForTests("bar", "android_common_myoverrideapex_bar_image").Rule("apexManifestRule")
+	overrideBarActualDefaultVersion := overrideBarManifestRule.Args["default_version"]
+	if overrideBarActualDefaultVersion != barExpectedDefaultVersion {
+		t.Errorf("expected to find defaultVersion %q; got %q", barExpectedDefaultVersion, barActualDefaultVersion)
+	}
 }
 
 func TestApexAvailable_ApexAvailableName(t *testing.T) {