android.net.lowpan: Added basic unit tests.

This change has all of the bits for supporting LoWPAN unit tests.
Additional tests are being written to improve code coverage, but this
seems like a good start.

Bug: b/33073713
Test: Successfully ran enclosed unit tests
Change-Id: Ib3750be5052bf1a90bf871756e9121b047d3871f
diff --git a/lowpan/tests/Android.mk b/lowpan/tests/Android.mk
new file mode 100644
index 0000000..bb0a944
--- /dev/null
+++ b/lowpan/tests/Android.mk
@@ -0,0 +1,65 @@
+# Copyright (C) 2017 The Android Open Source Project
+#
+# 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.
+
+LOCAL_PATH:= $(call my-dir)
+
+# Make test APK
+# ============================================================
+include $(CLEAR_VARS)
+
+LOCAL_MODULE_TAGS := tests
+
+LOCAL_SRC_FILES := $(call all-subdir-java-files)
+
+# This list is generated from the java source files in this module
+# The list is a comma separated list of class names with * matching zero or more characters.
+# Example:
+#   Input files: src/com/android/server/lowpan/Test.java src/com/android/server/lowpan/AnotherTest.java
+#   Generated exclude list: com.android.server.lowpan.Test*,com.android.server.lowpan.AnotherTest*
+
+# Filter all src files to just java files
+local_java_files := $(filter %.java,$(LOCAL_SRC_FILES))
+# Transform java file names into full class names.
+# This only works if the class name matches the file name and the directory structure
+# matches the package.
+local_classes := $(subst /,.,$(patsubst src/%.java,%,$(local_java_files)))
+# Utility variables to allow replacing a space with a comma
+comma:= ,
+empty:=
+space:= $(empty) $(empty)
+# Convert class name list to jacoco exclude list
+# This appends a * to all classes and replace the space separators with commas.
+# These patterns will match all classes in this module and their inner classes.
+jacoco_exclude := $(subst $(space),$(comma),$(patsubst %,%*,$(local_classes)))
+
+jacoco_include := android.net.lowpan.*
+
+LOCAL_JACK_COVERAGE_INCLUDE_FILTER := $(jacoco_include)
+LOCAL_JACK_COVERAGE_EXCLUDE_FILTER := $(jacoco_exclude)
+
+LOCAL_STATIC_JAVA_LIBRARIES := \
+	android-support-test \
+	guava \
+	mockito-target-minus-junit4 \
+	frameworks-base-testutils \
+
+LOCAL_JAVA_LIBRARIES := \
+	android.test.runner \
+
+LOCAL_PACKAGE_NAME := FrameworksLowpanApiTests
+LOCAL_COMPATIBILITY_SUITE := device-tests
+
+LOCAL_CERTIFICATE := platform
+LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
+include $(BUILD_PACKAGE)