diff --git a/tests/integration/test_reports.py b/tests/integration/test_reports.py
new file mode 100644
index 0000000..fb57a49
--- /dev/null
+++ b/tests/integration/test_reports.py
@@ -0,0 +1,213 @@
+"""Integration tests for reports."""
+
+import json
+import tempfile
+from pathlib import Path
+
+import pytest
+from vibeguard.reports.generator import ReportGenerator
+
+
+class TestReportGenerator:
+    """Tests for report generator."""
+
+    def test_generate_json_report(self, tmp_path):
+        """Test generating JSON report."""
+        issues = [
+            {
+                "pattern": "PY001",
+                "severity": "warning",
+                "file": "test.py",
+                "line": 1,
+                "message": "Magic string detected",
+                "suggestion": "Extract to constant",
+            }
+        ]
+
+        output_path = tmp_path / "report.json"
+        generator = ReportGenerator()
+
+        generator.generate_json(issues, str(output_path))
+
+        assert output_path.exists()
+
+        with open(output_path) as f:
+            report = json.load(f)
+
+        assert "version" in report
+        assert "timestamp" in report
+        assert "summary" in report
+        assert "issues" in report
+        assert len(report["issues"]) == 1
+
+    def test_load_json_report(self, tmp_path):
+        """Test loading issues from JSON file."""
+        issues = [
+            {
+                "pattern": "PY001",
+                "severity": "warning",
+                "file": "test.py",
+                "line": 1,
+                "message": "Magic string detected",
+                "suggestion": "Extract to constant",
+            }
+        ]
+
+        input_file = tmp_path / "input.json"
+        input_file.write_text(json.dumps({"issues": issues}))
+
+        generator = ReportGenerator()
+        loaded_issues = generator.load_json(str(input_file))
+
+        assert len(loaded_issues) == 1
+        assert loaded_issues[0]["pattern"] == "PY001"
+
+    def test_generate_sarif_report(self, tmp_path):
+        """Test generating SARIF report."""
+        issues = [
+            {
+                "pattern": "PY001",
+                "severity": "warning",
+                "file": "test.py",
+                "line": 1,
+                "message": "Magic string detected",
+                "suggestion": "Extract to constant",
+            }
+        ]
+
+        output_path = tmp_path / "report.sarif"
+        generator = ReportGenerator()
+
+        generator.generate_sarif(issues, str(output_path))
+
+        assert output_path.exists()
+
+        with open(output_path) as f:
+            sarif = json.load(f)
+
+        assert "$schema" in sarif
+        assert sarif["version"] == "2.1.0"
+        assert "runs" in sarif
+        assert len(sarif["runs"]) == 1
+
+    def test_sarif_rule_generation(self, tmp_path):
+        """Test SARIF rule generation."""
+        issues = [
+            {
+                "pattern": "PY001",
+                "severity": "warning",
+                "file": "test.py",
+                "line": 1,
+                "message": "Test message",
+                "suggestion": "Test suggestion",
+            },
+            {
+                "pattern": "PY002",
+                "severity": "error",
+                "file": "test.py",
+                "line": 2,
+                "message": "Test message 2",
+                "suggestion": "Test suggestion 2",
+            },
+        ]
+
+        output_path = tmp_path / "report.sarif"
+        generator = ReportGenerator()
+
+        generator.generate_sarif(issues, str(output_path))
+
+        with open(output_path) as f:
+            sarif = json.load(f)
+
+        rules = sarif["runs"][0]["tool"]["driver"]["rules"]
+        assert len(rules) == 2
+
+    def test_sarif_severity_mapping(self, tmp_path):
+        """Test SARIF severity level mapping."""
+        test_cases = [
+            ("critical", "error"),
+            ("error", "error"),
+            ("warning", "warning"),
+            ("info", "note"),
+        ]
+
+        for vibeguard_severity, expected_sarif in test_cases:
+            issues = [
+                {
+                    "pattern": "TEST",
+                    "severity": vibeguard_severity,
+                    "file": "test.py",
+                    "line": 1,
+                    "message": "Test",
+                    "suggestion": "Test",
+                }
+            ]
+
+            output_path = tmp_path / "report.sarif"
+            generator = ReportGenerator()
+
+            generator.generate_sarif(issues, str(output_path))
+
+            with open(output_path) as f:
+                sarif = json.load(f)
+
+            result = sarif["runs"][0]["results"][0]
+            assert result["level"] == expected_sarif
+
+    def test_summary_generation(self, tmp_path):
+        """Test summary generation."""
+        issues = [
+            {"pattern": "P1", "severity": "critical"},
+            {"pattern": "P2", "severity": "error"},
+            {"pattern": "P3", "severity": "error"},
+            {"pattern": "P4", "severity": "warning"},
+            {"pattern": "P5", "severity": "warning"},
+            {"pattern": "P6", "severity": "warning"},
+            {"pattern": "P7", "severity": "info"},
+        ]
+
+        generator = ReportGenerator()
+        summary = generator._generate_summary(issues)
+
+        assert summary["critical"] == 1
+        assert summary["error"] == 2
+        assert summary["warning"] == 3
+        assert summary["info"] == 1
+        assert summary["total"] == 7
+
+    def test_empty_issues(self, tmp_path):
+        """Test report generation with no issues."""
+        generator = ReportGenerator()
+
+        output_path = tmp_path / "report.json"
+        generator.generate_json([], str(output_path))
+
+        with open(output_path) as f:
+            report = json.load(f)
+
+        assert report["summary"]["total"] == 0
+
+    def test_html_report_generation(self, tmp_path):
+        """Test HTML report generation."""
+        issues = [
+            {
+                "pattern": "PY001",
+                "severity": "warning",
+                "file": "test.py",
+                "line": 1,
+                "message": "Magic string detected",
+                "suggestion": "Extract to constant",
+            }
+        ]
+
+        output_path = tmp_path / "report.html"
+        generator = ReportGenerator()
+
+        generator.generate_html(issues, str(output_path))
+
+        assert output_path.exists()
+
+        content = output_path.read_text()
+        assert "VibeGuard Analysis Report" in content
+        assert "Magic string detected" in content
+        assert "PY001" in content