<commit_before>#include <stan/agrad/rev/operator_not_equal.hpp>
#include <test/agrad/util.hpp>
#include <gtest/gtest.h>
<commit_msg>splitting operator!= tests out of test/agrad/agrad_test.cpp<commit_after>#include <stan/agrad/rev/operator_not_equal.hpp>
#include <test/agrad/util.hpp>
#include <gtest/gtest.h>

TEST(AgradRev,a_neq_y) {
  AVAR a = 2.0;
  double y = 3.0;
  EXPECT_TRUE(a != y);
  EXPECT_TRUE(y != a);
  double z = 2.0;
  EXPECT_FALSE(a != z);
  EXPECT_FALSE(z != a);
}
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