# Running or Testing an OS Project

OSDK allows for convenient building, running,
and testing of an OS project.
The following example shows the typical workflow.

Suppose you have created a new kernel project named `myos`
and you are in the project directory:

```bash
cargo osdk new --kernel myos && cd myos
```

## Build the project

To build the project and its dependencies,
simply type:

```bash
cargo osdk build
```

The initial build of an OSDK project
may take a considerable amount of time 
as it involves downloading the Rust toolchain used by the framekernel.
However, this is a one-time process.

## Run the project

To launch the kernel with QEMU,
use the following command:

```bash
cargo osdk run
```

OSDK will boot the kernel
and initialize OS resources like the console for output,
and then hand over control to the kernel entry point
to execute the kernel code.

**Note**: Only kernel projects (the projects
that defines the function marked with `#[ostd::main]`)
can be run;
library projects cannot.


## Test the project

Suppose you have created a new library project named `mylib` 
which contains a default test case 
and you are in the project directory.

```bash
cargo osdk new --lib mylib && cd mylib
```

To run the kernel mode tests, use the following command:

```bash
cargo osdk test
```

OSDK will run all the kernel mode tests in the crate.

Test cases can be added not only in library projects 
but also in kernel projects.

If you want to run a specific test with a given name,
for example, if the test is named `foo`,
use the following command:

```bash
cargo osdk test foo
```

## Options

Both `build`, `run`, and `test` commands accept options
to control their behavior, such as how to compile and
launch the kernel.
The following documentations provide details on
all the available options:

- [build options](../reference/commands/build.md)
- [run options](../reference/commands/run.md)
- [test options](../reference/commands/test.md)