[infer][java] add more example of inter-target NPEs for the Buck integration

Summary: This new tests outlines that Infer does not detect inter-target issues involving native methods.

Reviewed By: sblackshear

Differential Revision: D5720873

fbshipit-source-id: cce8193

infer/tests/build_systems/buck/issues.exp

@@ -1,3 +1,4 @@
 infer/tests/build_systems/genrule/module1/Class1.java, void Class1.localNPE1(), 2, NULL_DEREFERENCE, [start of procedure localNPE1()]
+infer/tests/build_systems/genrule/module2/Class2.java, void Class2.interTargetAbstractNPE(Class1), 2, NULL_DEREFERENCE, [start of procedure interTargetAbstractNPE(...),Skipped call: function or method not found]
 infer/tests/build_systems/genrule/module2/Class2.java, void Class2.interTargetNPE(), 2, NULL_DEREFERENCE, [start of procedure interTargetNPE(),start of procedure returnsNull(),return from a call to String Class1.returnsNull()]
 infer/tests/build_systems/genrule/module2/Class2.java, void Class2.localNPE2(), 2, NULL_DEREFERENCE, [start of procedure localNPE2()]

infer/tests/build_systems/genrule/module1/Class1.java

@@ -11,10 +11,9 @@ package genrule.module1;
 
 import genrule.annotations.Nullable;
 
-public class Class1 {
+public abstract class Class1 {
 
-  @Nullable
+  public static @Nullable String returnsNull() {
-  public static String returnsNull() {
     return null;
   }
 
@@ -23,4 +22,8 @@ public class Class1 {
     obj.toString();
   }
 
+  public abstract @Nullable Object abstractMayReturnNull();
+
+  public native @Nullable Object nativeMayReturnNull();
+
 }

infer/tests/build_systems/genrule/module2/Class2.java

@@ -13,13 +13,23 @@ import genrule.module1.Class1;
 
 public class Class2 {
 
+  void localNPE2() {
+    Object obj = null;
+    obj.toString();
+  }
+
   void interTargetNPE() {
     Object obj = Class1.returnsNull();
     obj.toString();
   }
 
-  void localNPE2() {
+  void interTargetAbstractNPE(Class1 class1) {
-    Object obj = null;
+    Object obj = class1.abstractMayReturnNull();
+    obj.toString();
+  }
+
+  void FN_interTargetNativeNPE(Class1 class1) {
+    Object obj = class1.nativeMayReturnNull();
     obj.toString();
   }