diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index cdde80fd..5458192e 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -11,8 +11,8 @@ env:
   RUST_BACKTRACE: full
 
 jobs:
-  test:
-    name: test
+  lint:
+    name: lint
     strategy:
       matrix:
         os:
@@ -30,4 +30,58 @@ jobs:
       - run: cargo fetch
       - run: cargo fmt -- --check --color always
       - run: cargo clippy
+
+  test:
+    name: test
+    strategy:
+      matrix:
+        os:
+          - ubuntu-latest
+        node:
+          - 20
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: Swatinem/rust-cache@v2
+      # Used by ruff
+      - uses: actions/setup-python@v5
+        with:
+          cache: "pip"
+      # Used by biome
+      - uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node }}
+      # Used by nimpretty
+      - uses: jiro4989/setup-nim-action@v1
+      # Used by zigfmt
+      - uses: goto-bus-stop/setup-zig@v2
+      - uses: uncenter/setup-taplo@v1
+
+      - run: rustup toolchain install stable --profile minimal
+      - run: rustup component add rustfmt clippy
+
+      - name: Validate taplo
+        run: taplo --version
+
+      - name: Install ruff
+        run: pip install ruff
+
+      - name: Validate ruff
+        run: ruff --version
+
+      - name: Install stylua
+        run: cargo install stylua
+
+      - name: Validate stylua
+        run: stylua --version
+
+      - name: Validate biome
+        run: npx --yes @biomejs/biome --version
+
+      - name: Validate nimpretty
+        run: nimpretty --version
+
+      - name: Validate zig fmt
+        run: zig fmt --help
+
       - run: cargo test
diff --git a/src/formatters/biome.rs b/src/formatters/biome.rs
index 6dbdca39..f8cd4e04 100644
--- a/src/formatters/biome.rs
+++ b/src/formatters/biome.rs
@@ -17,3 +17,97 @@ pub fn format_using_biome(file_path: &std::path::Path) -> std::io::Result<Option
 
     Ok(None)
 }
+
+#[cfg(test)]
+mod test_biome {
+    use crate::{
+        formatters::{biome::format_using_biome, setup_snippet},
+        languages::Language,
+    };
+
+    #[test]
+    fn it_should_format_json() {
+        let input = "          
+              {
+    // comments are allowed
+              \"key\": \"value\", 
+  \"key2\": [
+      \"value2\", 
+      \"value3\", 
+      1
+            , null]
+ }
+  ";
+
+        let expected_output = "{
+\t// comments are allowed
+\t\"key\": \"value\",
+\t\"key2\": [\"value2\", \"value3\", 1, null]
+}
+";
+
+        let snippet = setup_snippet(input, Language::Json.to_file_ext())
+            .expect("it to create a snippet file");
+
+        let output = format_using_biome(snippet.path())
+            .expect("it to be succesful")
+            .expect("it to be some");
+
+        assert_eq!(expected_output, output);
+    }
+
+    #[test]
+    fn it_should_format_javascript() {
+        let input = "          
+    async function asyncAddition(
+            a,b
+        ) {
+        return a+b 
+    }
+
+            ";
+
+        let expected_output = "async function asyncAddition(a, b) {
+\treturn a + b;
+}
+";
+
+        let snippet = setup_snippet(input, Language::JavaScript.to_file_ext())
+            .expect("it to create a snippet file");
+
+        let output = format_using_biome(snippet.path())
+            .expect("it to be succesful")
+            .expect("it to be some");
+
+        assert_eq!(expected_output, output);
+    }
+
+    #[test]
+    fn it_should_format_typescript() {
+        let input = "          
+    async function asyncAddition(
+            a:number,b:number
+        ) :Promise<
+number> 
+    {
+        return a+b 
+    }
+
+            ";
+
+        let expected_output =
+            "async function asyncAddition(a: number, b: number): Promise<number> {
+\treturn a + b;
+}
+";
+
+        let snippet = setup_snippet(input, Language::TypeScript.to_file_ext())
+            .expect("it to create a snippet file");
+
+        let output = format_using_biome(snippet.path())
+            .expect("it to be succesful")
+            .expect("it to be some");
+
+        assert_eq!(expected_output, output);
+    }
+}
diff --git a/src/formatters/nimpretty.rs b/src/formatters/nimpretty.rs
index 7f74c290..628cc889 100644
--- a/src/formatters/nimpretty.rs
+++ b/src/formatters/nimpretty.rs
@@ -11,3 +11,30 @@ pub fn format_using_nimpretty(file_path: &std::path::Path) -> std::io::Result<Op
 
     Ok(None)
 }
+
+#[cfg(test)]
+mod test_nimpretty {
+    use crate::{
+        formatters::{nimpretty::format_using_nimpretty, setup_snippet},
+        languages::Language,
+    };
+
+    #[test]
+    fn it_should_format_toml() {
+        let input = "proc           add( a         :int , b:int )        : int =
+  return a +          b  ";
+
+        let expected_output = "proc add(a: int, b: int): int =
+  return a + b
+";
+
+        let snippet =
+            setup_snippet(input, Language::Nim.to_file_ext()).expect("it to create a snippet file");
+
+        let output = format_using_nimpretty(snippet.path())
+            .expect("it to be succesful")
+            .expect("it to be some");
+
+        assert_eq!(expected_output, output);
+    }
+}
diff --git a/src/formatters/ruff.rs b/src/formatters/ruff.rs
index e0e19bab..2d2c285f 100644
--- a/src/formatters/ruff.rs
+++ b/src/formatters/ruff.rs
@@ -14,3 +14,26 @@ pub fn format_using_ruff(file_path: &std::path::Path) -> std::io::Result<Option<
 
     Ok(None)
 }
+
+#[cfg(test)]
+mod test_ruff {
+    use crate::{formatters::setup_snippet, languages::Language};
+
+    use super::format_using_ruff;
+
+    #[test]
+    fn it_should_format_python() {
+        let input = "def add( a: int ,  b:int)->int: return a+b";
+
+        let expected_output = "def add(a: int, b: int) -> int:\n    return a + b\n";
+
+        let snippet = setup_snippet(input, Language::Python.to_file_ext())
+            .expect("it to create a snippet file");
+
+        let output = format_using_ruff(snippet.path())
+            .expect("it to be succesful")
+            .expect("it to be some");
+
+        assert_eq!(expected_output, output);
+    }
+}
diff --git a/src/formatters/rustfmt.rs b/src/formatters/rustfmt.rs
index e3a28b0d..c07ecc70 100644
--- a/src/formatters/rustfmt.rs
+++ b/src/formatters/rustfmt.rs
@@ -14,3 +14,30 @@ pub fn format_using_rustfmt(file_path: &std::path::Path) -> std::io::Result<Opti
 
     Ok(None)
 }
+
+#[cfg(test)]
+mod test_rustfmt {
+    use crate::{formatters::setup_snippet, languages::Language};
+
+    use super::format_using_rustfmt;
+
+    #[test]
+    fn it_should_format_rust() {
+        let input = "pub     
+                    async 
+            fn    add( a: i32, 
+                            b:i32 )->                   i32 {a+b}
+    ";
+
+        let expected_output = "pub async fn add(a: i32, b: i32) -> i32 {\n    a + b\n}\n";
+
+        let snippet = setup_snippet(input, Language::Rust.to_file_ext())
+            .expect("it to create a snippet file");
+
+        let output = format_using_rustfmt(snippet.path())
+            .expect("it to be succesful")
+            .expect("it to be some");
+
+        assert_eq!(expected_output, output);
+    }
+}
diff --git a/src/formatters/stylua.rs b/src/formatters/stylua.rs
index 7ef1e5e6..b0fe06c5 100644
--- a/src/formatters/stylua.rs
+++ b/src/formatters/stylua.rs
@@ -12,3 +12,37 @@ pub fn format_using_stylua(file_path: &std::path::Path) -> std::io::Result<Optio
 
     Ok(None)
 }
+
+#[cfg(test)]
+mod test_stylua {
+    use crate::{
+        formatters::{setup_snippet, stylua::format_using_stylua},
+        languages::Language,
+    };
+
+    #[test]
+    fn it_should_format_lua() {
+        let input = "
+
+        local               function        add (                                       a , b
+)
+
+return              a +b
+
+
+end
+
+    ";
+
+        let expected_output = "local function add(a, b)\n\treturn a + b\nend\n";
+
+        let snippet =
+            setup_snippet(input, Language::Lua.to_file_ext()).expect("it to create a snippet file");
+
+        let output = format_using_stylua(snippet.path())
+            .expect("it to be succesful")
+            .expect("it to be some");
+
+        assert_eq!(expected_output, output);
+    }
+}
diff --git a/src/formatters/taplo.rs b/src/formatters/taplo.rs
index 19a2f984..c21d00f4 100644
--- a/src/formatters/taplo.rs
+++ b/src/formatters/taplo.rs
@@ -12,3 +12,31 @@ pub fn format_using_taplo(file_path: &std::path::Path) -> std::io::Result<Option
 
     Ok(None)
 }
+
+#[cfg(test)]
+mod test_taplo {
+    use crate::{
+        formatters::{setup_snippet, taplo::format_using_taplo},
+        languages::Language,
+    };
+
+    #[test]
+    fn it_should_format_toml() {
+        let input = "          package         =              \"mdsf\"
+  author   = \"Mads Hougesen\" 
+  ";
+
+        let expected_output = "package = \"mdsf\"
+author = \"Mads Hougesen\"
+";
+
+        let snippet = setup_snippet(input, Language::Toml.to_file_ext())
+            .expect("it to create a snippet file");
+
+        let output = format_using_taplo(snippet.path())
+            .expect("it to be succesful")
+            .expect("it to be some");
+
+        assert_eq!(expected_output, output);
+    }
+}
diff --git a/src/formatters/zigfmt.rs b/src/formatters/zigfmt.rs
index 143e200f..fab7a1eb 100644
--- a/src/formatters/zigfmt.rs
+++ b/src/formatters/zigfmt.rs
@@ -13,3 +13,35 @@ pub fn format_using_zigfmt(file_path: &std::path::Path) -> std::io::Result<Optio
 
     Ok(None)
 }
+
+#[cfg(test)]
+mod test_zigfmt {
+    use crate::{
+        formatters::{setup_snippet, zigfmt::format_using_zigfmt},
+        languages::Language,
+    };
+
+    #[test]
+    fn it_should_format_zig() {
+        let input = "
+    fn     add   (a : i32    , b :   i32 )             i32 {
+        return a + b ;
+
+    }
+    ";
+
+        let expected_output = "fn add(a: i32, b: i32) i32 {
+    return a + b;
+}
+";
+
+        let snippet =
+            setup_snippet(input, Language::Zig.to_file_ext()).expect("it to create a snippet file");
+
+        let output = format_using_zigfmt(snippet.path())
+            .expect("it to be succesful")
+            .expect("it to be some");
+
+        assert_eq!(expected_output, output);
+    }
+}