Add entrypoint to build test

Just for convenience, nothing special here

build.py

@@ -102,7 +102,7 @@ def zip_with_msg(zip_file, source, target):
 def collect_binary():
     for arch in archs + arch64:
         mkdir_p(os.path.join('native', 'out', arch))
-        for bin in ['magisk', 'magiskinit', 'magiskinit64', 'magiskboot', 'busybox']:
+        for bin in ['magisk', 'magiskinit', 'magiskinit64', 'magiskboot', 'busybox', 'test']:
             source = os.path.join('native', 'libs', arch, bin)
             target = os.path.join('native', 'out', arch, bin)
             mv(source, target)
@@ -183,14 +183,14 @@ def run_ndk_build(flags):
 
 
 def build_binary(args):
-    support_targets = {'magisk', 'magiskinit', 'magiskboot', 'busybox'}
+    support_targets = {'magisk', 'magiskinit', 'magiskboot', 'busybox', 'test'}
     if args.target:
         args.target = set(args.target) & support_targets
         if not args.target:
             return
     else:
         # If nothing specified, build everything
-        args.target = support_targets
+        args.target = ['magisk', 'magiskinit', 'magiskboot', 'busybox']
 
     header('* Building binaries: ' + ' '.join(args.target))
 
@@ -230,6 +230,9 @@ def build_binary(args):
     if 'magiskboot' in args.target:
         run_ndk_build('B_BOOT=1')
 
+    if 'test' in args.target:
+        run_ndk_build('B_TEST=1')
+
 
 def build_apk(args, module):
     build_type = 'Release' if args.release else 'Debug'

native/build.gradle

@@ -12,7 +12,7 @@ android {
         externalNativeBuild {
             ndkBuild {
                 // Pass arguments to ndk-build.
-                arguments('B_MAGISK=1', 'B_INIT64=1', 'B_BOOT=1',
+                arguments('B_MAGISK=1', 'B_INIT64=1', 'B_BOOT=1', 'B_TEST=1',
                         'MAGISK_DEBUG=1', 'MAGISK_VERSION=debug', 'MAGISK_VER_CODE=INT_MAX')
             }
         }

native/jni/.gitignore

@@ -0,0 +1 @@
+test.cpp

native/jni/Android.mk

@@ -121,6 +121,19 @@ include $(BUILD_EXECUTABLE)
 
 endif
 
+ifdef B_TEST
+
+include $(CLEAR_VARS)
+LOCAL_MODULE := test
+LOCAL_STATIC_LIBRARIES := libutils
+LOCAL_C_INCLUDES := \
+	jni/include \
+	$(LIBUTILS)
+LOCAL_SRC_FILES := test.cpp
+include $(BUILD_EXECUTABLE)
+
+endif
+
 ifdef B_BB
 
 include jni/external/busybox/Android.mk