start work on encrypt/decrypt test classes

OpenKeychain-Test/build.gradle

@@ -42,6 +42,10 @@ dependencies {
     }
 }
 
+test {
+    exclude '**/*$*'
+}
+
 android {
     projectUnderTest ':OpenKeychain'
 }
@@ -64,7 +68,7 @@ jacocoTestReport {
         html.destination "${buildDir}/jacocoHtml"
     }
     // class R is used, but usage will not be covered, so ignore this class from report
-    classDirectories = fileTree(dir: '../OpenKeychain/build/intermediates/classes/debug/org/sufficientlysecure/keychain', exclude: 'R*.class')
+    classDirectories = fileTree(dir: '../OpenKeychain/build/intermediates/classes/debug/org/sufficientlysecure/keychain', exclude: [ 'R*.class' ])
     additionalSourceDirs = files(coverageSourceDirs)
     executionData = files('build/jacoco/testDebug.exec')
 }