diff --git a/bin/index.js b/bin/index.js
index 7400cf2..581b152 100755
--- a/bin/index.js
+++ b/bin/index.js
@@ -59,15 +59,15 @@ yargs(hideBin(process.argv))
     }
   ).
   command(
-    'installFromPackageJson  [packageJson] [destination_folder]',
-    'Install dependencies from package.json file.',
+    'installFromPackageJson [packageJson] [destination_folder]',
+    'Install dependencies from package.json file containing an "rdependencies" entry.',
     (yargs) => {
       yargs.
         positional('packageJson', {
-        type: 'string',
-        describe: 'Path to the package.json file.',
+          type: 'string',
+          describe: 'Path to the package.json file.',
           default: "package.json",
-      })
+        })
         .positional('destination_folder', {
           type: 'string',
           default: "./webr_packages",
@@ -75,5 +75,5 @@ yargs(hideBin(process.argv))
         });
     }, (argv) => {
       installFromPackageJson(argv.packageJson, argv.destination_folder)
-     })
+    })
   .parse();
\ No newline at end of file
diff --git a/src/installFromPackagejson.js b/src/installFromPackagejson.js
index d982328..4498024 100644
--- a/src/installFromPackagejson.js
+++ b/src/installFromPackagejson.js
@@ -1,14 +1,20 @@
 const fs = require('fs');
 const installIt = require('./install');
+const {parsePackageJson} = require('./packagejsonmanip');
 
-function installFromPackageJson(destination_folder = "webr_packages") {
+function installFromPackageJson(
+  package_json = "package.json",
+  destination_folder = "webr_packages"
+) {
   // Read the package.json file
-  const packageJson = fs.readFileSync('package.json', 'utf8');
-  const dependencies = JSON.parse(packageJson).rdependencies;
-
-  // Loop over the dependencies and run installIt for each entry
+  const package_json_read = parsePackageJson(package_json);
+  const dependencies = package_json_read.rdependencies;
+  // Install the dependencies
   for (const dependency in dependencies) {
-    installIt(dependency);
+    installIt(
+      dependency,
+      destination_folder
+    );
   }
 }
 
diff --git a/src/packagejsonmanip.js b/src/packagejsonmanip.js
index a5356aa..738646b 100644
--- a/src/packagejsonmanip.js
+++ b/src/packagejsonmanip.js
@@ -6,7 +6,7 @@ function parsePackageJson(filePath) {
     const packageJson = JSON.parse(fileContent);
     return packageJson;
   } catch (error) {
-    console.error('Error parsing package.json:', error);
+    console.error('Error parsing pouet.json:', error);
     return null;
   }
 }
diff --git a/tests/packagejsonmanip.test.js b/tests/packagejsonmanip.test.js
new file mode 100644
index 0000000..cda1269
--- /dev/null
+++ b/tests/packagejsonmanip.test.js
@@ -0,0 +1,71 @@
+const fs = require('fs');
+const packageJsonManip = require('../src/packagejsonmanip');
+const path = require('path');
+const os = require('os');
+
+describe('packagejsonmanip', () => {
+  describe('parsePackageJson', () => {
+    it('should parse the package.json file and return an object', () => {
+      const filePath = 'path/to/package.json';
+      const packageJson = {
+        name: 'my-package',
+        version: '1.0.0',
+        dependencies: {
+          lodash: '^4.17.21',
+          axios: '^0.21.1'
+        }
+      };
+      fs.readFileSync = jest.fn().mockReturnValue(JSON.stringify(packageJson));
+
+      const result = packageJsonManip.parsePackageJson(filePath);
+
+      expect(result).toEqual(packageJson);
+    });
+  });
+
+  describe('writePackageJson', () => {
+    it('should write the package.json file with the provided content', () => {
+      const packageJson = {
+        name: 'my-package',
+        version: '1.0.0',
+        dependencies: {
+          lodash: '^4.17.21',
+          axios: '^0.21.1'
+        }
+      };
+      // create a temp json file
+      let temp_file = path.join(os.tmpdir(), 'package.json');
+      packageJsonManip.writePackageJson(temp_file, packageJson);
+
+      // expect the file to exist
+      const result = packageJsonManip.parsePackageJson(temp_file);
+      expect(result).toEqual(packageJson);
+    });
+  });
+
+  describe('addDependencies', () => {
+    it('should add the provided dependencies to the package.json file', () => {
+      expect(true).toEqual(true);
+      const packageJson = {
+        name: 'my-package',
+        version: '1.0.0',
+        dependencies: {
+          lodash: '^4.17.21',
+          axios: '^0.21.1'
+        }
+      };
+      // create a temp json file
+      let temp_file = path.join(os.tmpdir(), 'package.json');
+      console.log('ouetpu', temp_file);
+      packageJsonManip.writePackageJson(temp_file, packageJson);
+
+      // add a new dependency
+      packageJsonManip.addDependencies('golem', temp_file);
+
+      // expect the new dependency to be added
+      const result = packageJsonManip.parsePackageJson(temp_file);
+
+      expect(JSON.parse(result).rdependencies).toContain('golem');
+    });
+  });
+});