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I added the origin of remote repository in my code.
My existing repository have three branches: master, test, user.

But after adding and confirming the remote origin by command 'git remote -v', the 'git branch --list' command is displaying only one branch that is master.

I don't know if it is exactly pointing to that origin where I want to push the code.
I want to push the new code to test branch.

git branch -avv

 master                     first commit
 origin                     first commit
* test                       first commit
 remotes/origin/master      Update register.tsx
 remotes/origin/test        Update next.config.js
 remotes/origin/aman        june 25

I want to push it to remote test branch and delete local branches origin, test and master.

 git switch -c test
 fatal: only one reference expected

And when I tried to switch to remote/origin/test branch from vscode it says branch 'test' already exists.

Answers

For that, you need:

git fetch

Then a git branch -avv will show you all branches and their SHA1.

Note: only git branch --all/-a would list local as well as remote branches.

You can then compare master and origin/master commits.

Explanation: see "Git Internals - The Refspec"

$ git remote add origin https://github.com/schacon/simplegit-progit

Running the command above adds a section to your repository’s .git/config file, specifying the name of the remote (origin), the URL of the remote repository, and the refspec to be used for fetching:

[remote "origin"]
  url = https://github.com/schacon/simplegit-progit
  fetch = +refs/heads/*:refs/remotes/origin/*

The fetch refspec is the reason why a git fetch would populate the origin namespace with all the remote branches Git can find from the remote repository.

I want to push the new code to test branch.

If you have:

• code currently being modified, but not yet added/committed
• only one local branch (master)

You can do:

git fetch
git switch -c test
git add .
git commit -m "Code for test"
git rebase origin/test
git push

Since you do a git fetch first, the local branch test will follow automatically origin/test.
See git switch:

If <branch> is not found, but there does exist a tracking branch in exactly one remote (call it <remote>) with a matching name, treat as equivalent to:

$ git switch -c <branch> --track <remote>/<branch>

The rebase step ensures your local commit is done/reploayed on top origin/test.

I have one local commit but that was not intentional.
I want to push the code to remote/test branch and rest local branches like master, origin and test I want delete them all

Then I would, to make sure I don't loose anything:

• clone your remote repository elsewhere, directly on the test branch (using git clone --branch/-b)
• import your current code
• make a new commit in the test branch
• push test

That is:

cd /path/to/existing/local/repo
cd ..
git clone -b test https://github.com/<me>/<myRemoteRepo> repo2
cd repo2
git --work-tree=../repo add .
git commit -m "Import from original local repo"
git push