Add unit test for java_replace_nondet

Author: Owen Jones

unit/java_bytecode/java_replace_nondet/Main.class

@@ -0,0 +1,121 @@
+/*******************************************************************\
+
+ Module: Tests for the replace nondet pass to make sure it works both
+         when remove_returns has been run before and after the call.
+
+ Author: Diffblue Ltd.
+
+\*******************************************************************/
+
+#include <testing-utils/catch.hpp>
+#include <testing-utils/load_java_class.h>
+
+#include <goto-programs/goto_convert_functions.h>
+#include <goto-programs/remove_virtual_functions.h>
+#include <util/config.h>
+#include <goto-instrument/cover.h>
+#include <util/options.h>
+#include <iostream>
+#include <goto-programs/remove_returns.h>
+#include <goto-programs/replace_java_nondet.h>
+#include <goto-programs/remove_instanceof.h>
+
+void validate_method_removal(
+  std::list<goto_programt::instructiont> instructions)
+{
+  bool method_removed = true, replacement_nondet_exists = false;
+
+  // Quick loop to check that our method call has been replaced.
+  for(const auto &inst : instructions)
+  {
+    if(inst.is_assign())
+    {
+      const code_assignt &assignment = to_code_assign(inst.code);
+      if (assignment.rhs().id() == ID_side_effect)
+      {
+        const side_effect_exprt &see = to_side_effect_expr(assignment.rhs());
+        if(see.get_statement() == ID_nondet)
+        {
+          replacement_nondet_exists = true;
+        }
+      }
+    }
+
+    if(inst.is_function_call())
+    {
+      const code_function_callt &function_call =
+        to_code_function_call(inst.code);
+
+      // Small check to make sure the instruction is a symbol.
+      if(function_call.function().id() != ID_symbol)
+        continue;
+
+      const irep_idt function_id =
+        to_symbol_expr(function_call.function()).get_identifier();
+      if(
+        function_id ==
+        "java::org.cprover.CProver.nondetWithoutNull:()"
+        "Ljava/lang/Object;")
+      {
+        method_removed = false;
+      }
+    }
+  }
+
+  REQUIRE(method_removed);
+  REQUIRE(replacement_nondet_exists);
+}
+
+TEST_CASE(
+  "Load class with a generated java nondet method call, run remove returns "
+  "both before and after the nondet statements have been removed, check results "
+  "are as expected.", "[core][java_bytecode][replace_nondet]")
+{
+  GIVEN("A class with a call to CProver.nondetWithoutNull()")
+  {
+    symbol_tablet raw_symbol_table = load_java_class(
+      "Main", "./java_bytecode/java_replace_nondet", "Main.replaceNondet");
+
+    journalling_symbol_tablet symbol_table =
+      journalling_symbol_tablet::wrap(raw_symbol_table);
+
+    null_message_handlert null_output;
+    goto_functionst functions;
+    goto_convert(symbol_table, functions, null_output);
+
+    const std::string function_name = "java::Main.replaceNondet:()V";
+    goto_functionst::goto_functiont &goto_function =
+      functions.function_map.at(function_name);
+
+    goto_model_functiont model_function(
+      symbol_table, functions, function_name, goto_function);
+
+    remove_instanceof(goto_function, symbol_table);
+
+    remove_virtual_functions(model_function);
+
+    WHEN("Remove returns is called before java nondet.")
+    {
+      remove_returns(model_function, [](const irep_idt &) { return false; });
+
+      replace_java_nondet(functions);
+
+      THEN("The nondet method call should have been removed.")
+      {
+        validate_method_removal(goto_function.body.instructions);
+      }
+    }
+
+    WHEN("Remove returns is called after java nondet.")
+    {
+      replace_java_nondet(functions);
+
+      remove_returns(model_function, [](const irep_idt &) { return false; });
+
+      THEN("The nondet method call should have been removed.")
+      {
+        validate_method_removal(goto_function.body.instructions);
+      }
+    }
+  }
+}

unit/java_bytecode/java_replace_nondet/replace_nondet.cpp

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+public class Main {
+    public void replaceNondet() {
+        Object test = org.cprover.CProver.nondetWithoutNull();
+    }
+}