Can Googletest value-parameterized with multiple,

Question

I'd like to write C++ Google tests which can use value-parameterized tests with multiple parameters of different data types, ideally matching the complexity of the following mbUnit tests written in C++/CLI.

Note how compact this is, with the [Test] attribute indicating this is a test method and the [Row(...)] attributes defining the values for an instantiation.

[Test]
[Row("Empty.mdb", "select count(*) from collar", 0)]
[Row("SomeCollars.mdb", "select count(*) from collar", 17)]
[Row("SomeCollars.mdb", "select count(*) from collar where max_depth=100", 4)]
void CountViaDirectSQLCommand(String^ dbname, String^ command, int numRecs)
{
   String^ dbFilePath = testDBFullPath(dbname);
   {
       StAnsi fpath(dbFilePath);
       StGdbConnection db( fpath );
       db->Connect(fpath);
       int result = db->ExecuteSQLReturningScalar(StAnsi(command));
       Assert::AreEqual(numRecs, result);
   }
}

Or even better, this more exotic testing from C# (pushing the boundaries of what can be defined in .Net attributes beyond what's possible in C++/CLI):

[Test]
[Row("SomeCollars.mdb", "update collar set x=0.003 where hole_id='WD004'", "WD004",
    new string[] { "x", "y" },
    new double[] { 0.003, 7362.082 })]  // y value unchanged 
[Row("SomeCollars.mdb", "update collar set x=1724.8, y=6000 where hole_id='WD004'", "WD004",
    new string[] { "x", "y" },
    new double[] { 1724.8, 6000.0 })]
public void UpdateSingleRowByKey(string dbname, string command, string idValue, string[] fields, double[] values)
{
...
}

The help says Value-parameterized tests will let you write your test only once and then easily instantiate and run it with an arbitrary number of parameter values. but I'm fairly certain that is referring to the number of test cases.

Even without varying the data types, it seems to me that a parameterized test can only take one parameter?

Answer 1

Yes, there's a single parameter. You can make that parameter be arbitrarily complex, though. You could adapting the code from the documentation to use you Row type, for example:

class AndyTest : public ::testing::TestWithParam<Row> {
  // You can implement all the usual fixture class members here.
  // To access the test parameter, call GetParam() from class
  // TestWithParam<T>.
};

Then define your parameterized test:

TEST_P(AndyTest, CountViaDirectSQLCommand)
{
  // Call GetParam() here to get the Row values
  Row const& p = GetParam();
  std::string dbFilePath = testDBFullPath(p.dbname);
  {
    StAnsi fpath(dbFilePath);
    StGdbConnection db(p.fpath);
    db.Connect(p.fpath);
    int result = db.ExecuteSQLReturningScalar(StAnsi(p.command));
    EXPECT_EQ(p.numRecs, result);
  }
}

Finally, instantiate it:

INSTANTIATE_TEST_CASE_P(InstantiationName, AndyTest, ::testing::Values(
  Row("Empty.mdb", "select count(*) from collar", 0),
  Row("SomeCollars.mdb", "select count(*) from collar", 17),
  Row("SomeCollars.mdb", "select count(*) from collar where max_depth=100", 4)
));