Change java stem attribute for both device and host

Bug: 329762127
Test: cd build/soong/java ; go test -run TestJavaLibHostWithStem
Test: cd build/soong/java ; go test -run TestAppStem
Test: cd build/soong/java ; go test -run TestAndroidAppImport_ArchVariants
Test: cd build/soong/java ; go test -run TestOverrideAndroidAppStem
Test: cd build/soong/java ; go test -run TestOverrideAndroidApp
Test: cd build/soong/java ; go test -run TestPackageNameOverride

Change-Id: I8fbdc82116f9a0c68121fbbeb1ef4f78f2b6fea3

java/app_test.go

@@ -4401,3 +4401,20 @@ func TestNoDexpreoptOptionalUsesLibDoesNotHaveImpl(t *testing.T) {
 	dexpreopt := result.ModuleForTests("app", "android_common").MaybeRule("dexpreopt").Rule
 	android.AssertBoolEquals(t, "dexpreopt should be disabled if optional_uses_libs does not have an implementation", true, dexpreopt == nil)
 }
+
+func TestAppStem(t *testing.T) {
+	ctx := testApp(t, `
+				android_app {
+					name: "foo",
+					srcs: ["a.java"],
+					stem: "foo-new",
+					sdk_version: "current",
+				}`)
+
+	foo := ctx.ModuleForTests("foo", "android_common")
+
+	outputs := fmt.Sprint(foo.AllOutputs())
+	if !strings.Contains(outputs, "foo-new.apk") {
+		t.Errorf("Module output does not contain expected apk %s", "foo-new.apk")
+	}
+}