How do I correctly structure an if/or statement in python?

I have a class containing a series of if/or statements below:

class Tester:
    def __init__(self, name, test1, test2):
        self.name = name
        self.test1 = test1
        self.test2 = test2

        if (self.test1 == "halides") or (self.test2 == "halides"):
            halideTest()
        elif (self.test1 == "carbonate") or (self.test2 == "carbonate"):
            carbonateTest()
        elif (self.test1 == "sulphate") or (self.test2 == "sulphate"):
            sulphateTest()
        elif (self.test1 == "sulphite") or (self.test2 == "sulphite"):
            sulphiteTest()
        elif (self.test1 == "nitrate") or (self.test2 == "nitrate"):
            nitrateTest()
        elif (self.test1 == "nitrite") or (self.test2 == "nitrite"):
            nitriteTest()

Which is supposed to take conduct two of the six possible tests by being instantiated like so:

tester1 = new Tester("bob", "nitrate", "sulphate").

however, when I create a new tester like that, only the first function (test1, in this case nitrateTest) is called, whereas I expected the functions of test1 and test2 to both be called.

How can I restructure my code to make this happen?