diff --git a/.husky/pre-commit b/.husky/pre-commit
index 375d2a1..c3fef93 100755
--- a/.husky/pre-commit
+++ b/.husky/pre-commit
@@ -2,3 +2,4 @@
 . "$(dirname -- "$0")/_/husky.sh"
 
 bun run lint-staged
+git add
\ No newline at end of file
diff --git a/package.json b/package.json
index dd76793..89473a3 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,9 @@
     "format": "bunx prettier --write .",
     "format:check": "bunx prettier --check .",
     "test": "bun test",
-    "prepare": "husky install"
+    "prepare": "husky install",
+    "dev": "bun run format:check && bun run lint && bun run build",
+    "dev:watch": "bun run --watch src -- bun run dev"
   },
   "devDependencies": {
     "@eslint/css": "^0.10.0",
diff --git a/src/core/compilers/CompilerFactory.test.ts b/src/core/compilers/CompilerFactory.test.ts
new file mode 100644
index 0000000..4f34b5b
--- /dev/null
+++ b/src/core/compilers/CompilerFactory.test.ts
@@ -0,0 +1,26 @@
+import { CompilerFactory } from './CompilerFactory.ts';
+import { CompilerType } from './CompilerType.ts';
+import { describe, expect, it } from 'bun:test';
+import type { Compiler } from './Compiler.ts';
+
+describe('CompilerFactory', () => {
+  it('should return a valid compiler instance for each supported type', () => {
+    const fixture: CompilerType[] = [CompilerType.HANDLEBARS];
+
+    for (const type of fixture) {
+      const compiler: Compiler = CompilerFactory.getCompiler(type);
+      expect(compiler).toBeDefined();
+      expect(compiler).toHaveProperty('compile');
+    }
+  });
+
+  it('should throw an error for unsupported compiler types', () => {
+    const fixture: CompilerType[] = ['UNSUPPORTED_TYPE' as unknown as CompilerType];
+
+    for (const type of fixture) {
+      expect(() => CompilerFactory.getCompiler(type)).toThrowError(
+        `Unsupported compiler type: ${type}`
+      );
+    }
+  });
+});
diff --git a/src/core/compilers/CompilerType.test.ts b/src/core/compilers/CompilerType.test.ts
new file mode 100644
index 0000000..ef54575
--- /dev/null
+++ b/src/core/compilers/CompilerType.test.ts
@@ -0,0 +1,9 @@
+import { CompilerType } from './CompilerType';
+import { describe, expect, it } from 'bun:test';
+
+describe('CompilerType', () => {
+  it('should be an enum', () => {
+    expect(typeof CompilerType).toBe('object');
+    expect(Object.keys(CompilerType)).toContain('HANDLEBARS');
+  });
+});
diff --git a/src/core/compilers/HandlebarsCompiler.test.ts b/src/core/compilers/HandlebarsCompiler.test.ts
new file mode 100644
index 0000000..c7970eb
--- /dev/null
+++ b/src/core/compilers/HandlebarsCompiler.test.ts
@@ -0,0 +1,62 @@
+import { HandlebarsCompiler } from './HandlebarsCompiler';
+import { CompilerType } from './CompilerType';
+import { describe, expect, it } from 'bun:test';
+
+describe('HandlebarsCompiler', () => {
+  const compiler = HandlebarsCompiler.getInstance();
+
+  it('should return the singleton instance', () => {
+    expect(compiler).toBeInstanceOf(HandlebarsCompiler);
+    expect(HandlebarsCompiler.getInstance()).toBe(compiler);
+  });
+
+  it('should have the correct compiler type', () => {
+    expect(HandlebarsCompiler.TYPE).toBe(CompilerType.HANDLEBARS);
+  });
+
+  it('should compile valid Handlebars templates', () => {
+    type Fixture = {
+      actual: {
+        template: string;
+        data: object;
+      };
+      expected: string;
+    };
+
+    const fixture: Fixture[] = [
+      {
+        actual: {
+          template: `Hello, {{name}}!`,
+          data: { name: 'World' },
+        },
+        expected: 'Hello, World!',
+      },
+    ];
+
+    for (const { actual, expected } of fixture) {
+      expect(compiler.compile(actual.template, actual.data)).toBe(expected);
+    }
+  });
+
+  it('should throw an error for invalid Handlebars templates', () => {
+    type Fixture = {
+      actual: {
+        template: string;
+        data: object;
+      };
+    };
+
+    const fixture: Fixture[] = [
+      {
+        actual: {
+          template: `Hello, {{name!}}`,
+          data: { name: 'World' },
+        },
+      },
+    ];
+
+    for (const { actual } of fixture) {
+      expect(() => compiler.compile(actual.template, actual.data)).toThrowError();
+    }
+  });
+});
diff --git a/src/core/compilers/HandlebarsCompiler.ts b/src/core/compilers/HandlebarsCompiler.ts
index 1a26631..87fc5c2 100644
--- a/src/core/compilers/HandlebarsCompiler.ts
+++ b/src/core/compilers/HandlebarsCompiler.ts
@@ -2,7 +2,7 @@ import { type Compiler, CompilerType } from '.';
 import { compile } from 'handlebars';
 
 export class HandlebarsCompiler implements Compiler {
-  static readonly TYPE: CompilerType = CompilerType.HANDLEBARS;
+  public static readonly TYPE: CompilerType = CompilerType.HANDLEBARS;
 
   private static instance: HandlebarsCompiler;
   private constructor() {}
diff --git a/src/core/io/FileManager.test.ts b/src/core/io/FileManager.test.ts
new file mode 100644
index 0000000..b4146c4
--- /dev/null
+++ b/src/core/io/FileManager.test.ts
@@ -0,0 +1,17 @@
+import { FileManager } from './FileManager';
+import { describe, expect, it } from 'bun:test';
+
+describe('FileManager', () => {
+  it('should read a file successfully', async () => {
+    const content = await FileManager.read('tests/core/io/test.txt');
+    expect(content).toBeDefined();
+    expect(typeof content).toBe('string');
+    expect(content).toContain('This is a test file.');
+  });
+
+  it('should throw an error for a non-existent file', async () => {
+    expect(FileManager.read('./non-existent.txt')).rejects.toThrow(
+      "ENOENT: no such file or directory, open './non-existent.txt'"
+    );
+  });
+});
diff --git a/src/core/io/FileManager.ts b/src/core/io/FileManager.ts
index f63a156..11a5016 100644
--- a/src/core/io/FileManager.ts
+++ b/src/core/io/FileManager.ts
@@ -36,4 +36,17 @@ export class FileManager {
       flag: 'w',
     });
   }
+
+  /**
+   * Removes a file at the specified path.
+   * @param {string} filePath - The path to the file to remove.
+   * @returns {Promise<void>} A promise that resolves when the file is removed.
+   */
+  public static async remove(filePath: string): Promise<void> {
+    if (existsSync(filePath)) {
+      writeFileSync(filePath, '', { encoding: 'utf-8', flag: 'w' });
+    } else {
+      throw new Error(`File not found: ${filePath}`);
+    }
+  }
 }
diff --git a/src/core/parsers/YamlParser.test.ts b/src/core/parsers/YamlParser.test.ts
index 41eb084..ddce8e4 100644
--- a/src/core/parsers/YamlParser.test.ts
+++ b/src/core/parsers/YamlParser.test.ts
@@ -1,9 +1,19 @@
 import { YamlParser } from './YamlParser';
+import { ParserType } from './ParserType';
 import { describe, expect, it } from 'bun:test';
 
 describe('YamlParser', () => {
   const parser = YamlParser.getInstance();
 
+  it('should return the singleton instance', () => {
+    expect(parser).toBeInstanceOf(YamlParser);
+    expect(YamlParser.getInstance()).toBe(parser);
+  });
+
+  it('should have the correct parser type', () => {
+    expect(YamlParser.TYPE).toBe(ParserType.YAML);
+  });
+
   it('should parse valid YAML data', () => {
     type Fixture = {
       actual: string;
diff --git a/tests/core/io/test.txt b/tests/core/io/test.txt
new file mode 100644
index 0000000..af27ff4
--- /dev/null
+++ b/tests/core/io/test.txt
@@ -0,0 +1 @@
+This is a test file.
\ No newline at end of file