Getting started with pytest Transcripts
Chapter: Parametrization
Lecture: Parametrizing functions with two parameters
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Now finally let's take a look at function parameterIzation. So we're gonna take this one test that let's fix that so that actually passes
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if we try to run it again. That starts against done. So we'll take this test and turn it into a function
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parameterIzation instead. So it's this is not too hard it just doesn't give us the detail and the information we want.
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So it's still we're just still gonna do one test but we're gonna parameterize it the right way. First off we need to import pytest and then we will
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decorate it with pytest mark, parameterize and then we have to give it a list of things we're parameterizing
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So in this case we've got both the summary and the state that are different So we'll pass in both those summary state and it's the starting summary in
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the starting state. We could specify that or we could just leave like this I think this is fine. So for each of those we're gonna have a list of
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a set of those. So a list of we've got the list and this will be For the first one. We'll just do it's gonna be 123. And todo in Prog done.
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That's what we want. So delete that that's really what we want and we just need to have the well it's kind of all we could probably put
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all this stuff here. So that's not bad. So that's a parameterize summary state. 1 2 3 to do, in prog, done.
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So each of the times through the list we're going to pass in this pair to the test so I need to give it the the parameter names,
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summary and state. And then we will go back to assigning just one card. So C equals card summary state. Oh we need state equals state.
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We don't need to specify the first one. We can if we want summary equals summary in the summary.
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Equal summary. This is may be confusing if you haven't seen this before this is the parameter name and this is the value.
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So let's actually put start here so we're not confusing ourselves. Start summary and start state. And then now the value of state that we're passing
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in card is start state and start summary there. Now we can go back to this here we go. Inventing looks weird. Well so now we've got is this it.
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All right. This list parameterize and the parameters test, finish, start summary. Oh this is wrong. Start summary Start state start summary,
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start state. They get matched up with here and let's go actually let's print it just to make sure because this I don't know if I trust it print let's
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do an F string start summary equals start state vehicles. pytest. Let's just make sure this works.
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Oh yeah it works a little worried there for a second. If we do verbose it will show up.
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This is neat actually. So that the last one when we just did the combined test Func combined. No, not test.
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Func combined combined finish. That's right. Just so showed one and now we're showing that the different test cases and it shows
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that with test brackets and that's what parameterization looks like you got one todo 123 and todo in Prog done. Yeah. So let's go through that top,
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walk through it again just to make sure that we're all understanding what's going on.
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So each time through the test this thing one is gonna get assigned to start summary
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to do is gonna get assigned to start state and then it will run through it And then it does the same thing with the second set and then the same
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thing with the third set. And let's go ahead and print these out just to make sure it's clear as mod wrong. One finish func params. There we go.
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The print out in each one of these. It's got the it's got the test node name and then it's printing start summaries,
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one star status to do is to do 123 to do in Prog done. They're pretty easy. Don't you think? Let's let's split that so we can compare those.
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It's not too bad. Oh I can see one thing that right off the bat that we're we're sort of doing too much work then we need to.
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So this is we're parameter rising to things. We really only need two parameters. One. I'll show you that next, but I think it's pretty good.
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The benefits far outweigh the downfalls. We don't need this Print summary anymore.
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We're pretty happy with that. So let's take a look at how we can simplify this with just one parameter.