Introduce a java_system_features_srcs wrapper for codegen

Use soong to aggregate all system feature-related build flags as input
to the existing system feature codegen tool. Use this instead of the
more clumsy raw genrule variant. This is an effective no-op in terms of
generated code or framework impact, but should improve maintainability.

Test: m --no-skip-soong-tests
Bug: 203143243
Change-Id: I67158dd6f0454556f8d75685cfc86a68b3e47089
diff --git a/systemfeatures/system_features_test.go b/systemfeatures/system_features_test.go
new file mode 100644
index 0000000..558bb95
--- /dev/null
+++ b/systemfeatures/system_features_test.go
@@ -0,0 +1,51 @@
+// Copyright 2024 Google Inc. All rights reserved.
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package systemfeatures
+
+import (
+	"android/soong/android"
+
+	"testing"
+)
+
+func TestJavaSystemFeaturesSrcs(t *testing.T) {
+	bp := `
+java_system_features_srcs {
+    name: "system-features-srcs",
+	full_class_name: "com.android.test.RoSystemFeatures",
+}
+`
+
+	res := android.GroupFixturePreparers(
+		android.FixtureRegisterWithContext(registerSystemFeaturesComponents),
+		android.PrepareForTestWithBuildFlag("RELEASE_USE_SYSTEM_FEATURE_BUILD_FLAGS", "true"),
+		android.PrepareForTestWithBuildFlag("RELEASE_SYSTEM_FEATURE_AUTOMOTIVE", "0"),
+		android.PrepareForTestWithBuildFlag("RELEASE_SYSTEM_FEATURE_TELEVISION", "UNAVAILABLE"),
+		android.PrepareForTestWithBuildFlag("RELEASE_SYSTEM_FEATURE_WATCH", ""),
+		android.PrepareForTestWithBuildFlag("RELEASE_NOT_SYSTEM_FEATURE_FOO", "BAR"),
+	).RunTestWithBp(t, bp)
+
+	module := res.ModuleForTests("system-features-srcs", "")
+	cmd := module.Rule("system-features-srcs").RuleParams.Command
+	android.AssertStringDoesContain(t, "Expected fully class name", cmd, " com.android.test.RoSystemFeatures ")
+	android.AssertStringDoesContain(t, "Expected readonly flag", cmd, "--readonly=true")
+	android.AssertStringDoesContain(t, "Expected AUTOMOTIVE feature flag", cmd, "--feature=AUTOMOTIVE:0 ")
+	android.AssertStringDoesContain(t, "Expected TELEVISION feature flag", cmd, "--feature=TELEVISION:UNAVAILABLE ")
+	android.AssertStringDoesContain(t, "Expected WATCH feature flag", cmd, "--feature=WATCH: ")
+	android.AssertStringDoesNotContain(t, "Unexpected FOO arg from non-system feature flag", cmd, "FOO")
+
+	systemFeaturesModule := module.Module().(*javaSystemFeaturesSrcs)
+	expectedOutputPath := "out/soong/.intermediates/system-features-srcs/gen/RoSystemFeatures.java"
+	android.AssertPathsRelativeToTopEquals(t, "Expected output file", []string{expectedOutputPath}, systemFeaturesModule.Srcs())
+}