### Question:
CommonCodegenUtils { public static Optional<AssignExpr> getAssignExpression(final BlockStmt body, final String assignExpressionName) { final List<AssignExpr> assignExprs = body.findAll(AssignExpr.class); return assignExprs.stream() .filter(assignExpr -> assignExpressionName.equals(assignExpr.getTarget().asNameExpr().getNameAsString())) .findFirst(); } private  CommonCodegenUtils(); static void populateMethodDeclarations(final ClassOrInterfaceDeclaration toPopulate,
                                                  final Collection<MethodDeclaration> methodDeclarations); static ExpressionStmt getFilteredKiePMMLNameValueExpression(final String kiePMMLNameValueListParam,
                                                                       final String fieldNameToRef,
                                                                       boolean stringLiteralComparison); static void addMapPopulation(final Map<String, MethodDeclaration> toAdd,
                                        final BlockStmt body,
                                        final String mapName); static MethodDeclaration getMethodDeclaration(final String methodName,
                                                         final Map<String, ClassOrInterfaceType> parameterNameTypeMap); static MethodDeclaration getMethodDeclaration(final String methodName); static ReturnStmt getReturnStmt(final String returnedVariableName); static ClassOrInterfaceType getTypedClassOrInterfaceType(final String className,
                                                                    final List<String> typesName ); static void setAssignExpressionValue( final BlockStmt body, final String assignExpressionName, final Expression value); static Optional<AssignExpr> getAssignExpression(final BlockStmt body, final String assignExpressionName); static Optional<ExplicitConstructorInvocationStmt> getExplicitConstructorInvocationStmt(final BlockStmt body); static void setExplicitConstructorInvocationArgument(final ExplicitConstructorInvocationStmt constructorInvocationStmt, final String parameterName, final String value); static Optional<NameExpr> getExplicitConstructorInvocationParameter(final ExplicitConstructorInvocationStmt constructorInvocationStmt, final String parameterName); static Optional<MethodDeclaration> getMethodDeclaration(final ClassOrInterfaceDeclaration classOrInterfaceDeclaration, final String methodName); static MethodDeclaration addMethod(final MethodDeclaration methodTemplate,
                                                 final ClassOrInterfaceDeclaration tableTemplate,
                                                 final String methodName); static Optional<VariableDeclarator> getVariableDeclarator(final BlockStmt body, final String variableName); static String OPTIONAL_FILTERED_KIEPMMLNAMEVALUE_NAME; }### Answer:
@Test public void getAssignExpression() { BlockStmt body = new BlockStmt(); Optional<AssignExpr> retrieved = CommonCodegenUtils.getAssignExpression(body, "NOMATCH"); assertNotNull(retrieved); assertFalse(retrieved.isPresent()); AssignExpr assignExpr = new AssignExpr(); assignExpr.setTarget(new NameExpr("MATCH")); body.addStatement(assignExpr); retrieved = CommonCodegenUtils.getAssignExpression(body, "NOMATCH"); assertNotNull(retrieved); assertFalse(retrieved.isPresent()); retrieved = CommonCodegenUtils.getAssignExpression(body, "MATCH"); assertNotNull(retrieved); assertTrue(retrieved.isPresent()); AssignExpr retrievedAssignExpr = retrieved.get(); assertEquals(assignExpr, retrievedAssignExpr); }