diff --git a/library/aws/tests/acm/test_acm_certificates_transparency_logs_enabled.py b/library/aws/tests/acm/test_acm_certificates_transparency_logs_enabled.py
new file mode 100644
index 00000000..9e924ef2
--- /dev/null
+++ b/library/aws/tests/acm/test_acm_certificates_transparency_logs_enabled.py
@@ -0,0 +1,158 @@
+import pytest
+from unittest.mock import MagicMock
+from botocore.exceptions import ClientError
+from tevico.engine.entities.report.check_model import (
+    CheckStatus,
+    CheckMetadata,
+    Remediation,
+    RemediationCode,
+    RemediationRecommendation,
+)
+from library.aws.checks.acm.acm_certificates_transparency_logs_enabled import (
+    acm_certificates_transparency_logs_enabled,
+)
+
+
+class TestAcmCertificatesTransparencyLogsEnabled:
+    """Test cases for ACM Certificates Transparency Logs Enabled check."""
+
+    def setup_method(self):
+        """Set up test method."""
+        self.metadata = CheckMetadata(
+            Provider="AWS",
+            CheckID="acm_certificates_transparency_logs_enabled",
+            CheckTitle="Check ACM Certificates Transparency Logs Enabled",
+            CheckType=["Security"],
+            ServiceName="ACM",
+            SubServiceName="Certificate",
+            ResourceIdTemplate="arn:aws:acm:{region}:{account}:certificate/{certificate_id}",
+            Severity="medium",
+            ResourceType="AWS::ACM::Certificate",
+            Risk="Certificates without transparency logs may not be trusted.",
+            Description="Checks if ACM certificates have transparency logging enabled.",
+            Remediation=Remediation(
+                Code=RemediationCode(CLI="", NativeIaC="", Terraform=""),
+                Recommendation=RemediationRecommendation(
+                    Text="Enable certificate transparency logging for ACM certificates.",
+                    Url="https://docs.aws.amazon.com/acm/latest/userguide/acm-concepts.html#concept-transparency"
+                )
+            )
+        )
+        self.check = acm_certificates_transparency_logs_enabled(metadata=self.metadata)
+        self.mock_session = MagicMock()
+        self.mock_acm = MagicMock()
+        self.mock_session.client.return_value = self.mock_acm  # Simplified (removed STS)
+
+    def test_no_certificates(self):
+        """Test when there are no ACM certificates."""
+        self.mock_acm.list_certificates.return_value = {"CertificateSummaryList": []}
+        report = self.check.execute(self.mock_session)
+
+        assert report.status == CheckStatus.NOT_APPLICABLE
+        assert report.resource_ids_status[0].summary == "No ACM certificates found."
+        assert not hasattr(report.resource_ids_status[0].resource, "arn")
+
+    def test_transparency_logs_enabled(self):
+        """Test when all certificates have transparency logs enabled."""
+        cert_arn = "arn:aws:acm:region:account:certificate/cert-1"
+        self.mock_acm.list_certificates.return_value = {
+            "CertificateSummaryList": [{"CertificateArn": cert_arn}]
+        }
+        self.mock_acm.describe_certificate.return_value = {
+            "Certificate": {"Options": {"CertificateTransparencyLoggingPreference": "ENABLED"}}
+        }
+
+        report = self.check.execute(self.mock_session)
+
+        assert report.status == CheckStatus.PASSED
+        assert report.resource_ids_status[0].summary == f"Certificate {cert_arn} has transparency logging enabled."
+        assert report.resource_ids_status[0].resource.arn == cert_arn
+
+    def test_transparency_logs_disabled(self):
+        """Test when a certificate has transparency logs disabled."""
+        cert_arn = "arn:aws:acm:region:account:certificate/cert-2"
+        self.mock_acm.list_certificates.return_value = {
+            "CertificateSummaryList": [{"CertificateArn": cert_arn}]
+        }
+        self.mock_acm.describe_certificate.return_value = {
+            "Certificate": {"Options": {"CertificateTransparencyLoggingPreference": "DISABLED"}}
+        }
+
+        report = self.check.execute(self.mock_session)
+
+        assert report.status == CheckStatus.FAILED
+        assert report.resource_ids_status[0].summary == f"Certificate {cert_arn} has transparency logging disabled."
+        assert report.resource_ids_status[0].resource.arn == cert_arn
+
+    def test_client_error(self):
+        """Test error handling when list_certificates raises ClientError."""
+        self.mock_acm.list_certificates.side_effect = ClientError(
+            {"Error": {"Code": "AccessDenied"}}, "ListCertificates"
+        )
+
+        report = self.check.execute(self.mock_session)
+
+        assert report.status == CheckStatus.UNKNOWN
+        assert report.resource_ids_status[0].summary == "Error fetching ACM certificates."
+        assert report.resource_ids_status[0].exception is not None
+        assert "AccessDenied" in report.resource_ids_status[0].exception
+
+    def test_describe_certificate_error(self):
+        """Test error handling when describe_certificate raises ClientError."""
+        cert_arn = "arn:aws:acm:region:account:certificate/cert-3"
+        self.mock_acm.list_certificates.return_value = {
+            "CertificateSummaryList": [{"CertificateArn": cert_arn}]
+        }
+        self.mock_acm.describe_certificate.side_effect = ClientError(
+            {"Error": {"Code": "AccessDenied"}}, "DescribeCertificate"
+        )
+
+        report = self.check.execute(self.mock_session)
+
+        assert report.status == CheckStatus.FAILED
+        assert report.resource_ids_status[0].summary == f"Error describing certificate {cert_arn}."
+        assert "AccessDenied" in report.resource_ids_status[0].exception
+        assert report.resource_ids_status[0].resource.arn == cert_arn
+
+    def test_no_such_entity_exception(self):
+        """Test handling when describe_certificate raises a ResourceNotFoundException."""
+        cert_arn = "arn:aws:acm:region:account:certificate/missing"
+        self.mock_acm.list_certificates.return_value = {
+            "CertificateSummaryList": [{"CertificateArn": cert_arn}]
+        }
+
+        class NoSuchEntityException(Exception):
+            pass
+
+        self.mock_acm.exceptions = MagicMock()
+        self.mock_acm.exceptions.ResourceNotFoundException = NoSuchEntityException
+        self.mock_acm.describe_certificate.side_effect = NoSuchEntityException("No such certificate")
+
+        report = self.check.execute(self.mock_session)
+
+        assert report.status == CheckStatus.FAILED
+        assert report.resource_ids_status[0].summary == f"Error describing certificate {cert_arn}."
+        assert "No such certificate" in report.resource_ids_status[0].exception
+        assert report.resource_ids_status[0].resource.arn == cert_arn
+
+    def test_paginated_certificates_list(self):
+        """Test paginated ACM certificate list."""
+        cert_arn_1 = "arn:aws:acm:region:account:certificate/cert-1"
+        cert_arn_2 = "arn:aws:acm:region:account:certificate/cert-2"
+
+        self.mock_acm.list_certificates.side_effect = [
+            {"CertificateSummaryList": [{"CertificateArn": cert_arn_1}], "NextToken": "token-1"},
+            {"CertificateSummaryList": [{"CertificateArn": cert_arn_2}]}
+        ]
+
+        self.mock_acm.describe_certificate.side_effect = lambda CertificateArn: {
+            "Certificate": {"Options": {"CertificateTransparencyLoggingPreference": "ENABLED"}}
+        }
+
+        report = self.check.execute(self.mock_session)
+
+        assert report.status == CheckStatus.PASSED
+        assert len(report.resource_ids_status) == 2
+        assert all(r.status == CheckStatus.PASSED for r in report.resource_ids_status)
+        assert report.resource_ids_status[0].resource.arn == cert_arn_1
+        assert report.resource_ids_status[1].resource.arn == cert_arn_2