Add unit-tests for gson.

Also adds a common script to get test repos from github.

libraryBuilds/.gitignore

@@ -9,3 +9,7 @@ gradlew.bat
 # Generated by prep.sh
 common/local.properties
 localJ2objcDist/
+
+# Generated by prep-tests.sh
+test
+test-repo/

libraryBuilds/com.google.code.gson-gson/com.google.code.gson-gson/build.gradle

@@ -16,13 +16,23 @@
 
 dependencies {
     j2objcTranslation 'com.google.code.gson:gson:2.3.1:sources'
+
+    // If prep.sh is run, corresponding tests will be in src/test/java.
+    testCompile 'junit:junit:4.12'
+}
+
+test {
+    // https://github.com/j2objc-contrib/j2objc-common-libs-e2e-test/issues/35
+    exclude 'com/google/gson/functional/ThrowableFunctionalTest**'
 }
 
 j2objcConfig {
+    testPattern {
+        // https://github.com/j2objc-contrib/j2objc-common-libs-e2e-test/issues/35
+        exclude 'com/google/gson/functional/ThrowableFunctionalTest**'
+    }
+
     // package-info.java exists in multiple packages.
     filenameCollisionCheck false
-
-    // Almost always there are no tests provided in an external source jar.
-    testMinExpectedTests 0
     finalConfigure()
 }

libraryBuilds/com.google.code.gson-gson/com.google.code.gson-gson/prep.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+#
+# Copyright (c) 2015 the authors of j2objc-common-libs-e2e-test
+#
+# 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.
+
+../../common/prep-tests.sh gson-2.3.1 https://github.com/google/gson.git src/test

libraryBuilds/common/prep-tests.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+#
+# Copyright (c) 2015 the authors of j2objc-common-libs-e2e-test
+#
+# 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.
+
+set -v
+rm -rf test-repo
+rm -rf src/test
+rm -rf src
+
+set -ev
+TAG=$1
+REPO=$2
+TEST_DIR_IN_REPO=$3
+git clone --depth 1 --branch $TAG $REPO test-repo
+mkdir src
+ln -s ../test-repo/$TEST_DIR_IN_REPO src/test

libraryBuilds/run-test.sh

@@ -18,8 +18,20 @@
 set -ev
 
 TEST_DIR=$1
-echo Running test $TEST_DIR
 pushd $TEST_DIR
+
+echo Preparing test $TEST_DIR
+
+# Execute the prep.sh files within this project, if any.
+# These are often used to retrieve test sources for the libraries.
+find . -name prep.sh | while read PREP_SCRIPT_FILE
+do
+    pushd `dirname $PREP_SCRIPT_FILE`
+    sh prep.sh
+    popd
+done
+
+echo Running test $TEST_DIR
 ./gradlew wrapper
 ./gradlew clean
 ./gradlew build