So I'm dating this girl I met about a month ago. She's been throwing shit tests in almost every conversation we have and honestly I'm getting exhausted. She wants me to laugh at her jokes, but she won't laugh at my jokes anymore. Sometimes I feel like if she's losing interest, but she replies my texts almost right after I text her. She's being bitchy, only when texting, but when we meet she's just how I like her to be.

This kinda throws me off.... I just don't get "it".

stop texting her first all the time if you are, make her work a little

I'm just going to assume this is your problem, and you can check it yourself
Are you controlling the frame? Girls don't get to shit test you if you're in control; everytime I've been S-Tested via text i've asked for it/earned it and saw it coming, There's never been a suprise test.
So what are you texting her? and how much are you letting her tell you what to do

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To game at your best you have to be willing to do your worst.

Well I do have to say that she has that attitude only when texting. When we are together, I totally control the frame.

She used to text me a lot before, in fact too much. I got myself a rule: Don't text unless you want to ask her out or she texted you first last time. So I texted her to ask her out, we live close to each other (20 minutes walking), and I told her "Hi im at the park with a friend, come over" and she replies, in less than a minute, "Hi, im at the mall, alone ". She uses for sarcasm. I replied "Come here". She says "No". I asked her why not, she replies "Cause I'm here fucking doing X and you are over there doing fucking nothing that's why". I didn't even bother to reply. I decided to text her later, as if nothing happened. So I texted later (about 4 or 5 hours later), and she still got that bitchy attitude. I told her "I'm going to sleep gotta wake up early, sweet dreams". Her reply "OK bye", an image with a 9gag post that says "Arguing with women is like getting arrested cause everything you say can be used against you" and ";) you know".

Charblad, she called me on wednesday after the Real Madrid game, just to ask who won (she's RM fan, I'm not). After a while, there was a silence, I had nothing to say, so she said "well I'm gonna hang up", I replied "Ok bye then" and I hung up.
I guess I'm kind of a dick sometimes. I know she didn't want to hang up. Im just GUESSING that's why she's acting like that.

You're texting her too much conveying neediness. get your text game in check.