diff --git a/tests/unit/test_output.py b/tests/unit/test_output.py
new file mode 100644
index 0000000..cb9148f
--- /dev/null
+++ b/tests/unit/test_output.py
@@ -0,0 +1,80 @@
+import pytest
+from unittest.mock import Mock, patch
+import json
+
+from depaudit.output import AuditResult, Formatter
+from depaudit.output.json_formatter import JSONFormatter
+from depaudit.output.table_formatter import TableFormatter
+from depaudit.output.factory import FormatterFactory
+
+
+class TestAuditResult:
+    def test_audit_result_default(self):
+        result = AuditResult()
+        assert result.vulnerabilities == []
+        assert result.outdated == []
+        assert result.license_issues == []
+        assert result.unused == []
+        assert result.scanned_count == 0
+
+    def test_audit_result_with_data(self):
+        result = AuditResult()
+        result.vulnerabilities.append({
+            "id": "CVE-2023-0001",
+            "severity": "critical",
+            "package_name": "test-pkg",
+        })
+        result.scanned_count = 5
+
+        summary = result.get_summary()
+        assert summary["total_vulnerabilities"] == 1
+        assert summary["severity_breakdown"]["critical"] == 1
+
+
+class TestJSONFormatter:
+    def test_format_json(self):
+        result = AuditResult()
+        result.vulnerabilities.append({
+            "id": "CVE-2023-0001",
+            "severity": "critical",
+            "package_name": "lodash",
+            "current_version": "4.17.15",
+            "fixed_version": "4.17.21",
+        })
+
+        formatter = JSONFormatter()
+        output = formatter.format(result)
+
+        assert isinstance(output, str)
+        parsed = json.loads(output)
+        assert "vulnerabilities" in parsed
+        assert len(parsed["vulnerabilities"]) == 1
+
+
+class TestTableFormatter:
+    def test_format_table(self):
+        result = AuditResult()
+        result.scanned_count = 3
+        result.vulnerabilities.append({
+            "id": "CVE-2023-0001",
+            "severity": "critical",
+            "package_name": "lodash",
+            "current_version": "4.17.15",
+            "fixed_version": "4.17.21",
+        })
+
+        formatter = TableFormatter(use_color=False, verbosity="info")
+        output = formatter.format(result)
+
+        assert isinstance(output, str)
+        assert "lodash" in output
+
+
+class TestFormatterFactory:
+    def test_get_json_formatter(self):
+        formatter = FormatterFactory.get_formatter("json", use_color=False)
+        assert isinstance(formatter, JSONFormatter)
+
+    def test_get_table_formatter(self):
+        formatter = FormatterFactory.get_formatter("table", use_color=False)
+        assert isinstance(formatter, TableFormatter)