add a4 tests

Tests/A4/J1_reachability_return/java/util/Random.java

Tests/A4/J1_reachableIfBody.java

Tests/A4/J1_unreachableAutomation.java

Tests/A4/J1_while1.java

Tests/A4/J1_while2.java

Tests/A4/J1_whiletrue1.java

Tests/A4/Je_7_DefiniteAssignment_2LazyOr_Assignment.java

Tests/A4/Je_7_DefiniteAssignment_3LazyOr_Assignment.java

Tests/A4/Je_7_Reachability_AfterElseReturn.java

Tests/A4/Je_7_Reachability_AfterIfReturn.java

Tests/A4/Je_7_Reachability_AfterIfReturnElseReturn.java

Tests/A4/Je_7_Reachability_AfterReturnEmptyBlock.java

Tests/A4/Je_7_Reachability_AfterReturn_Constructor.java

Tests/A4/Je_7_Reachability_AfterValueReturn.java

Tests/A4/Je_7_Reachability_AfterVoidReturn.java

Tests/A4/Je_7_Reachability_EmptyValueMethod.java

Tests/A4/Je_7_Reachability_ForFalse_1.java

Tests/A4/Je_7_Reachability_ForFalse_2.java

Tests/A4/Je_7_Reachability_ReturnReturn.java

Tests/A4/Je_7_Reachability_WhileFalse_ConstantFolding.java