Enzyme | NET asymmetric serializer | Pub Sub library

package.json

I have a functional component that i want to test it and i use the scroll position hook (plugin @n8tb1t/use-scroll-position) to get Y by passing callback argument. But i see that my test is not covering the callback of the scroll position hook.

my-component.js

I want to test the button which toggles the theme using material UI. How can I do it using Jest and enzyme. I am a newbie in testing and hence don't know much about it. Pardon for it.

Please don't bother about any functionality. The only thing I need is the testing code using Jest and Enzyme.

If you provide me the resource also that would be a great help.

Header.js

I'm attempting to solve a set of equations related to biological processes. One equation (of about 5) is for a pharmacokinetic (PK) curve of the form C = Co(exp(k1*t)-exp(k2*t). The need is to simultaneously solve the derivative of this equation along with some enzyme binding equations and initial results where not as expected. After troubleshooting, realized that the PK derivative doesn't numerically integrate by itself, if k is negative using the desolve ode function. I've attempted every method (lsode, lsoda, etc) in the ode function, with no success. I've tried adjusting rtol, it doesn't resolve.

Is there an alternative to the deSolve ode function I should investigate? Or another way to get at this problem?

Below is the code with a simplified equation to demonstrate the problem. When k is negative, the integrated solution does not match the analytical result. When k is positive, results are as expected.

First Image, result with k=0.2: Analytical and Integrated results match when k is positive

Second Image, result with k=-0.2: Integrated result does not match analytical when k is negative

I would like to run tests with Jest and Enzyme on Next.js's getServerSideProps function. The function looks like the following:

I am trying to learn React thorough a udemy course. And while testing the components of my project I am facing this error which keeps popping again and again and I can't figure out what's wrong. It worked well for the instructor with exact same code.

I am trying to apply spyOn to check whether my fucntion download is called on mouse click but I am getting the error. I am already follwoing this question but still no leads. Can anyone tell me where I went wrong. I cannot figure out any clue.

Error

I have results from a model that I extracted into a dataframe using this code: df1 <- coef(summary(mod1)). My dataframe with the model results has the estimates/model info that I want but the first column isn't registering as a column and is instead the labels for each row.

Q1) How do I make this first label column into an actual column that will show up when I try df1$?

Q2) Once I get this first column to register as a column, I'd like to separate the values at the colon so my dataframe looks like this: