diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
new file mode 100644
index 0000000..8740716
--- /dev/null
+++ b/.github/workflows/test.yaml
@@ -0,0 +1,39 @@
+name: Run Tests
+
+on:
+  pull_request:
+
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    name: Run Tests
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Cache cargo registry
+        uses: actions/cache@v4
+        with:
+          path: ~/.cargo/registry
+          key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-registry-
+
+      - name: Cache cargo index
+        uses: actions/cache@v4
+        with:
+          path: ~/.cargo/git
+          key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-index-
+
+      - name: Cache cargo build
+        uses: actions/cache@v4
+        with:
+          path: target
+          key: ${{ runner.os }}-cargo-build-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-build-
+
+      - name: Run Tests
+        run: cargo test
diff --git a/action.yaml b/action.yaml
index 9a484fd..2b9a743 100644
--- a/action.yaml
+++ b/action.yaml
@@ -20,7 +20,7 @@ runs:
     - name: Get Binary
       shell: bash
       run: |
-        BIN_URL=$(curl https://api.github.com/repos/LuisLiraC/git-diff/releases/tags/v1.0.0 | jq -r '.assets[0].browser_download_url')
+        BIN_URL=$(curl https://api.github.com/repos/LuisLiraC/git-diff/releases/tags/v1.0.1 | jq -r '.assets[0].browser_download_url')
         curl -s -L $BIN_URL -o rust-binary.tgz
         tar -xzvf rust-binary.tgz
         mv ./Linux/git-diff ./git-diff
diff --git a/src/main.rs b/src/main.rs
index 0c808a7..944c7f7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -14,9 +14,6 @@ fn main() {
     let args: Vec<String> = env::args().collect();
     let mut patterns_filters: Vec<PatternFilter> = Vec::new();
 
-    let mut exclude_patterns_filters: Vec<PatternFilter> = Vec::new();
-    let mut include_patterns_filters: Vec<PatternFilter> = Vec::new();
-
     for arg in args.iter() {
         if arg.starts_with("--patterns=") {
             patterns_filters = create_patterns_filters(&arg);
@@ -28,41 +25,19 @@ fn main() {
         return;
     }
 
-    patterns_filters.iter().for_each(|pattern_filter| {
-        if pattern_filter.exclude {
-            exclude_patterns_filters.push(pattern_filter.clone());
-        } else {
-            include_patterns_filters.push(pattern_filter.clone());
-        }
-    });
+    let (include_patterns_filters, exclude_patterns_filters) = categorize_filters(patterns_filters);
 
     let start = Instant::now();
     let changed_files = get_changed_files();
     let duration = start.elapsed();
     println!("Getting changed files done in: {:?}", duration);
 
-    let mut filtered_files: Vec<String> = Vec::new();
-
     let start = Instant::now();
-    for pattern in include_patterns_filters.iter() {
-        filtered_files.extend(filter_files_by_pattern(&pattern, changed_files.clone()));
-    }
+    let filtered_files = filter(changed_files, include_patterns_filters, exclude_patterns_filters);
     let duration = start.elapsed();
     println!("Filtering files done in: {:?}", duration);
 
-    let start = Instant::now();
-    for pattern in exclude_patterns_filters.iter() {
-        filtered_files = filtered_files
-            .iter()
-            .filter(|file| !Pattern::new(&pattern.pattern).expect("Failed to create pattern").matches(file))
-            .map(|file| file.to_string())
-            .collect();
-    }
-    let duration = start.elapsed();
-    println!("Excluding files done in: {:?}", duration);
-
-    println!("DIFF_FILES: {:?}", filtered_files);
-    println!("DIFF_COUNT: {}", filtered_files.len());
+    let count = get_count(filtered_files.clone());
 
     Command::new("sh")
         .arg("-c")
@@ -72,7 +47,7 @@ fn main() {
 
     Command::new("sh")
         .arg("-c")
-        .arg(format!("echo \"DIFF_COUNT={}\" >> $GITHUB_OUTPUT", filtered_files.len()))
+        .arg(format!("echo \"DIFF_COUNT={}\" >> $GITHUB_OUTPUT", count))
         .output()
         .expect("Failed to execute DIFF_COUNT command");
 }
@@ -144,15 +119,57 @@ fn get_changed_files() -> Vec<String> {
     changed_files
 }
 
-fn filter_files_by_pattern(pattern_filter: &PatternFilter, files: Vec<String>) -> Vec<String> {
+fn filter(changed_files: Vec<String>, include_patterns_filters: Vec<PatternFilter>, exclude_patterns_filters: Vec<PatternFilter>) -> Vec<String> {
+    let filtered_files: Vec<String> = include_patterns_filters
+        .iter()
+        .flat_map(|pattern| filter_files_by_pattern(pattern, &changed_files, &exclude_patterns_filters))
+        .collect();
+
+    filtered_files
+}
+
+fn filter_files_by_pattern(pattern_filter: &PatternFilter, files: &Vec<String>, exclude_patterns: &Vec<PatternFilter>) -> Vec<String> {
     let pattern = Pattern::new(&pattern_filter.pattern).expect("Failed to create pattern");
 
-    let filtered_files: Vec<String> = files
+    let mut filtered_files: Vec<String> = files
         .iter()
         .filter(|file| pattern.matches(file))
         .filter(|_| pattern_filter.exclude == false)
         .map(|file| file.to_string())
         .collect();
 
+    for exclude_pattern in exclude_patterns.iter() {
+        filtered_files = filtered_files
+            .iter()
+            .filter(|file| !Pattern::new(&exclude_pattern.pattern).expect("Failed to create pattern").matches(file))
+            .map(|file| file.to_string())
+            .collect();
+    }
+
     filtered_files
+}
+
+fn get_count(filtered_files: Vec<String>) -> usize {
+    filtered_files.len()
+}
+
+fn categorize_filters(filters: Vec<PatternFilter>) -> (Vec<PatternFilter>, Vec<PatternFilter>) {
+    let mut exclude_patterns_filters: Vec<PatternFilter> = Vec::new();
+    let mut include_patterns_filters: Vec<PatternFilter> = Vec::new();
+
+    filters.iter().for_each(|pattern_filter| {
+        if pattern_filter.exclude {
+            exclude_patterns_filters.push(pattern_filter.clone());
+        } else {
+            include_patterns_filters.push(pattern_filter.clone());
+        }
+    });
+
+    (include_patterns_filters, exclude_patterns_filters)
+}
+
+#[cfg(test)]
+mod tests {
+    mod unit;
+    mod integration;
 }
\ No newline at end of file
diff --git a/src/tests/integration.rs b/src/tests/integration.rs
new file mode 100644
index 0000000..7594924
--- /dev/null
+++ b/src/tests/integration.rs
@@ -0,0 +1,30 @@
+use crate::*;
+
+#[cfg(test)]
+mod integration {
+    use super::*;
+
+    #[test]
+    fn test_filter() {
+        let arg = "--patterns=*.rs,!*..txt";
+        let files = vec![
+            String::from("main.rs"),
+            String::from("lib.rs"),
+            String::from("test.txt"),
+        ];
+
+        let filters = create_patterns_filters(arg);
+
+        let (include_patterns_filters, exclude_patterns_filters) = categorize_filters(filters);
+
+        let filtered_files = filter(files, include_patterns_filters, exclude_patterns_filters);
+
+        let count = get_count(filtered_files.clone());
+
+        assert_eq!(
+            filtered_files,
+            vec![String::from("main.rs"), String::from("lib.rs")]
+        );
+        assert_eq!(count, 2);
+    }
+}
diff --git a/src/tests/unit.rs b/src/tests/unit.rs
new file mode 100644
index 0000000..ee114f7
--- /dev/null
+++ b/src/tests/unit.rs
@@ -0,0 +1,134 @@
+use crate::*;
+
+#[cfg(test)]
+mod unit {
+    use super::*;
+
+    #[test]
+    fn test_create_patterns_filters() {
+        let arg = "--patterns=*.rs,!test/*.rs";
+        let filters = create_patterns_filters(arg);
+        assert_eq!(filters.len(), 2);
+        assert_eq!(filters[0].pattern, "*.rs");
+        assert_eq!(
+            filters[0].exclude, false,
+            "Expected 'exclude' to be false for pattern '*.rs'"
+        );
+        assert_eq!(filters[1].pattern, "test/*.rs");
+        assert_eq!(filters[1].exclude, true);
+    }
+
+    #[test]
+    fn test_categorize_filters() {
+        let filters = vec![
+            PatternFilter {
+                pattern: String::from("*.rs"),
+                exclude: false,
+            },
+            PatternFilter {
+                pattern: String::from("test/*.rs"),
+                exclude: true,
+            },
+        ];
+        let (include_patterns_filters, exclude_patterns_filters) = categorize_filters(filters);
+        assert_eq!(include_patterns_filters.len(), 1);
+        assert_eq!(exclude_patterns_filters.len(), 1);
+        assert_eq!(include_patterns_filters[0].pattern, "*.rs");
+        assert_eq!(exclude_patterns_filters[0].pattern, "test/*.rs");
+    }
+
+    #[test]
+    fn test_filter() {
+        let files = vec![
+            String::from("main.rs"),
+            String::from("lib.rs"),
+            String::from("test.txt"),
+        ];
+        let include_patterns_filters = vec![
+            PatternFilter {
+                pattern: String::from("*.rs"),
+                exclude: false,
+            },
+            PatternFilter {
+                pattern: String::from("*.txt"),
+                exclude: false,
+            },
+        ];
+        let exclude_patterns_filters = vec![PatternFilter {
+            pattern: String::from("test.txt"),
+            exclude: true,
+        }];
+        let filtered_files = filter(files, include_patterns_filters, exclude_patterns_filters);
+        assert_eq!(
+            filtered_files,
+            vec![String::from("main.rs"), String::from("lib.rs")]
+        );
+    }
+
+    #[test]
+    fn test_filter_files_by_pattern() {
+        let pattern_filter = PatternFilter {
+            pattern: String::from("*.rs"),
+            exclude: false,
+        };
+        let files = vec![
+            String::from("main.rs"),
+            String::from("lib.rs"),
+            String::from("test.txt"),
+        ];
+        let filtered = filter_files_by_pattern(&pattern_filter, &files, &Vec::new());
+        assert_eq!(
+            filtered,
+            vec![String::from("main.rs"), String::from("lib.rs")]
+        );
+    }
+
+    #[test]
+    fn test_filter_exclude_files_exclusion() {
+        let mut filtered_files: Vec<String> = Vec::new();
+        let mut exclude_patterns_filters: Vec<PatternFilter> = Vec::new();
+        let mut include_patterns_filters: Vec<PatternFilter> = Vec::new();
+
+        include_patterns_filters.push(PatternFilter {
+            pattern: String::from("*.rs"),
+            exclude: false,
+        });
+
+        include_patterns_filters.push(PatternFilter {
+            pattern: String::from("*.txt"),
+            exclude: false,
+        });
+
+        exclude_patterns_filters.push(PatternFilter {
+            pattern: String::from("test.txt"),
+            exclude: true,
+        });
+
+        let files = vec![
+            String::from("main.rs"),
+            String::from("lib.rs"),
+            String::from("version.txt"),
+            String::from("test.txt"),
+        ];
+
+        for pattern in include_patterns_filters.iter() {
+            filtered_files.extend(filter_files_by_pattern(&pattern, &files, &exclude_patterns_filters));
+        }
+
+        assert_eq!(
+            filtered_files,
+            vec![String::from("main.rs"), String::from("lib.rs"), String::from("version.txt")]
+        );
+    }
+
+    #[test]
+    fn test_get_count() {
+        let files = vec![
+            String::from("main.rs"),
+            String::from("lib.rs"),
+            String::from("version.txt"),
+        ];
+        let count = get_count(files);
+        assert_eq!(count, 3);
+    }
+}