Add tests for verify callback

As we're about to change the chain construction logic, we want to make sure
the callback will still be called exactly when it should, and not on the
(upcoming) ignored certs in the chain.
diff --git a/tests/data_files/Readme-x509.txt b/tests/data_files/Readme-x509.txt
index 2cf0c66..680d612 100644
--- a/tests/data_files/Readme-x509.txt
+++ b/tests/data_files/Readme-x509.txt
@@ -17,6 +17,9 @@
 - test-int-ca2.crt "C=NL, O=PolarSSL, CN=PolarSSL Test Intermediate EC CA"
   uses an EC key with NIST P-256, signed by test-ca
 
+A third intermediate CA is signed by test-int-ca2.crt:
+- test-int-ca3.crt "C=UK, O=mbed TLS, CN=mbed TLS Test intermediate CA 3"
+
 Finally, other CAs for specific purposes:
 - enco-ca-prstr.pem: has its CN encoded as a printable string, but child cert
   enco-cert-utf8str.pem has its issuer's CN encoded as a UTF-8 string.
@@ -35,11 +38,12 @@
                 2   -> test-ca2.crt
                 I1  -> test-int-ca.crt
                 I2  -> test-int-ca2.crt
+                I3  -> test-int-ca3.crt
                 O   -> other
 - key type: R -> RSA, E -> EC
 - C -> there is a CRL revoking this cert (see below)
 - L -> CN=localhost (useful for local test servers)
-- P1, P2 if the file include parent (resp. parent + grandparent)
+- P1, P2 if the file includes parent (resp. parent + grandparent)
 - free-form comments
 
 List of certificates:
@@ -50,8 +54,9 @@
 - cert_v1_with_ext.crt: 1 R: v1 with extensions (illegal)
 - cli2.crt: 2 E: basic
 - enco-cert-utf8str.pem: see enco-ca-prstr.pem above
-- server1*.crt: 1* R C*: misc *(server1-v1 see test-ca-v1.crt above)
+- server1*.crt: 1* R C* P1*: misc *(server1-v1 see test-ca-v1.crt above)
     *CRL for: .cert_type.crt, .crt, .key_usage.crt, .v1.crt
+    P1 only for _ca.crt
 - server2-v1*.crt: O R: see test-ca-v1.crt above
 - server2*.crt: 1 R L: misc
 - server3.crt: 1 E L: EC cert signed by RSA CA
@@ -62,11 +67,13 @@
     -ku*: keyUsage (ds = signatures, ke/ka = key exchange/agreement)
 - server6-ss-child.crt: O E: "child" of non-CA server5-selfsigned
 - server6.crt, server6.pem: 2 E L C: revoked
-- server7*.crt: I1 E L P1*: EC signed by RSA signed by EC *(except 7.crt)
+- server7*.crt: I1 E L P1*: EC signed by RSA signed by EC
+    *P1 except 7.crt, P2 _int-ca_ca2.crt
     *_space: with PEM error(s)
 - server8*.crt: I2 R L: RSA signed by EC signed by RSA (P1 for _int-ca2)
 - server9*.crt: 1 R C* L P1*: signed using RSASSA-PSS
     *CRL for: 9.crt, -badsign, -with-ca (P1)
+- server10*.crt: I3 E L P2/P3
 
 Certificate revocation lists
 ----------------------------
diff --git a/tests/data_files/server10.key b/tests/data_files/server10.key
new file mode 100644
index 0000000..0088331
--- /dev/null
+++ b/tests/data_files/server10.key
@@ -0,0 +1,5 @@
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEILBDMs7bRVxVg6ovTpf2zB9m+22jY7R3LNKRvCPfa6YJoAoGCCqGSM49
+AwEHoUQDQgAEHG336dql6qGcsnIZqAkcc63eFbvepuOzTwXobRAuOmk3l4A5wXX/
+vs5wAawLX1wUTUM/AESHmAZrJK9tq5So8g==
+-----END EC PRIVATE KEY-----
diff --git a/tests/data_files/server10_int3_int-ca2.crt b/tests/data_files/server10_int3_int-ca2.crt
new file mode 100644
index 0000000..dfe889a
--- /dev/null
+++ b/tests/data_files/server10_int3_int-ca2.crt
@@ -0,0 +1,80 @@
+-----BEGIN CERTIFICATE-----
+MIIBWjCCAQCgAwIBAgIBSzAKBggqhkjOPQQDAjBKMQswCQYDVQQGEwJVSzERMA8G
+A1UEChMIbWJlZCBUTFMxKDAmBgNVBAMTH21iZWQgVExTIFRlc3QgaW50ZXJtZWRp
+YXRlIENBIDMwHhcNMTUwOTAxMTM0NzU1WhcNMjUwODI5MTM0NzU1WjAUMRIwEAYD
+VQQDEwlsb2NhbGhvc3QwWTATBgcqhkjOPQIBBggqhkjOPQMBBwNCAAQcbffp2qXq
+oZyychmoCRxzrd4Vu96m47NPBehtEC46aTeXgDnBdf++znABrAtfXBRNQz8ARIeY
+Bmskr22rlKjyow0wCzAJBgNVHRMEAjAAMAoGCCqGSM49BAMCA0gAMEUCIQDLc+Io
+rg8VxEbCgVv8iH+kOIEn9MjhpvKzvwUoV+6rjQIgZU/RXAyc1a+H2+soGfNEIOBQ
+AzO3pJx7WJAApZuBX1Q=
+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
+MIIBWjCCAQCgAwIBAgIBSzAKBggqhkjOPQQDAjBKMQswCQYDVQQGEwJVSzERMA8G
+A1UEChMIbWJlZCBUTFMxKDAmBgNVBAMTH21iZWQgVExTIFRlc3QgaW50ZXJtZWRp
+YXRlIENBIDMwHhcNMTUwOTAxMTM0NzU1WhcNMjUwODI5MTM0NzU1WjAUMRIwEAYD
+VQQDEwlsb2NhbGhvc3QwWTATBgcqhkjOPQIBBggqhkjOPQMBBwNCAAQcbffp2qXq
+oZyychmoCRxzrd4Vu96m47NPBehtEC46aTeXgDnBdf++znABrAtfXBRNQz8ARIeY
+Bmskr22rlKjyow0wCzAJBgNVHRMEAjAAMAoGCCqGSM49BAMCA0gAMEUCIQDLc+Io
+rg8VxEbCgVv8iH+kOIEn9MjhpvKzvwUoV+6rjQIgZU/RXAyc1a+H2+soGfNEIOBQ
+AzO3pJx7WJAApZuBX1Q=
+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
+MIIC6TCCAdGgAwIBAgIBDzANBgkqhkiG9w0BAQsFADA7MQswCQYDVQQGEwJOTDER
+MA8GA1UEChMIUG9sYXJTU0wxGTAXBgNVBAMTEFBvbGFyU1NMIFRlc3QgQ0EwHhcN
+MTMwOTI0MTYwODQyWhcNMjMwOTIyMTYwODQyWjBLMQswCQYDVQQGEwJOTDERMA8G
+A1UEChMIUG9sYXJTU0wxKTAnBgNVBAMTIFBvbGFyU1NMIFRlc3QgSW50ZXJtZWRp
+YXRlIEVDIENBMHYwEAYHKoZIzj0CAQYFK4EEACIDYgAE8Oih3fX5SLeN1dmFncQl
+WMw9+Y6sXblhlrXBxhXxjwdwpCHENn+foUVdrqYVYa7Suv3QVeO6nJ19H3QNixW8
+ik1P+hxsbaq8bta78vAyHmC4EmXQLg1w7oxb9Q82qX1Yo4GVMIGSMB0GA1UdDgQW
+BBQPib1jQevLXhco/2gwPcGI0JxYOTBjBgNVHSMEXDBagBS0WuSls97SUva51aaV
+D+s+vMf9/6E/pD0wOzELMAkGA1UEBhMCTkwxETAPBgNVBAoTCFBvbGFyU1NMMRkw
+FwYDVQQDExBQb2xhclNTTCBUZXN0IENBggEAMAwGA1UdEwQFMAMBAf8wDQYJKoZI
+hvcNAQELBQADggEBAAjeaTUaCBiXT1CYLVr6UFSeRNZBrDPnj6PwqUQTvgB5I5n6
+yXqoE4RYDaEL0Lg24juFxI26itBuypto6vscgGq77cfrP/avSdxU+xeZ4bCWvh3M
+ddj9lmko2U8I8GhBcHpSuIiTvgKDB8eKkjeq3AsLGchHDvip8pB3IhcNfL7W94Zf
+7/lH9VQiE3/px7amD32cidoPvWLA9U3f1FsPmJESUz0wwNfINpDjmPr8dGbkCN+M
+CFhxo6sCfK8KLYG4nYX8FwxVR86kpSrO9e84AX0YYbdzxprbc2XOaebJ8+BDmzut
+ARkD7DTXrodN1wV7jQJkrUuEwPj9Rhvk+MFRkaw=
+-----END CERTIFICATE-----
diff --git a/tests/data_files/server10_int3_int-ca2_ca.crt b/tests/data_files/server10_int3_int-ca2_ca.crt
new file mode 100644
index 0000000..e85cc4a
--- /dev/null
+++ b/tests/data_files/server10_int3_int-ca2_ca.crt
@@ -0,0 +1,160 @@
+-----BEGIN CERTIFICATE-----
+MIIBWjCCAQCgAwIBAgIBSzAKBggqhkjOPQQDAjBKMQswCQYDVQQGEwJVSzERMA8G
+A1UEChMIbWJlZCBUTFMxKDAmBgNVBAMTH21iZWQgVExTIFRlc3QgaW50ZXJtZWRp
+YXRlIENBIDMwHhcNMTUwOTAxMTM0NzU1WhcNMjUwODI5MTM0NzU1WjAUMRIwEAYD
+VQQDEwlsb2NhbGhvc3QwWTATBgcqhkjOPQIBBggqhkjOPQMBBwNCAAQcbffp2qXq
+oZyychmoCRxzrd4Vu96m47NPBehtEC46aTeXgDnBdf++znABrAtfXBRNQz8ARIeY
+Bmskr22rlKjyow0wCzAJBgNVHRMEAjAAMAoGCCqGSM49BAMCA0gAMEUCIQDLc+Io
+rg8VxEbCgVv8iH+kOIEn9MjhpvKzvwUoV+6rjQIgZU/RXAyc1a+H2+soGfNEIOBQ
+AzO3pJx7WJAApZuBX1Q=
+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
+MIIBWjCCAQCgAwIBAgIBSzAKBggqhkjOPQQDAjBKMQswCQYDVQQGEwJVSzERMA8G
+A1UEChMIbWJlZCBUTFMxKDAmBgNVBAMTH21iZWQgVExTIFRlc3QgaW50ZXJtZWRp
+YXRlIENBIDMwHhcNMTUwOTAxMTM0NzU1WhcNMjUwODI5MTM0NzU1WjAUMRIwEAYD
+VQQDEwlsb2NhbGhvc3QwWTATBgcqhkjOPQIBBggqhkjOPQMBBwNCAAQcbffp2qXq
+oZyychmoCRxzrd4Vu96m47NPBehtEC46aTeXgDnBdf++znABrAtfXBRNQz8ARIeY
+Bmskr22rlKjyow0wCzAJBgNVHRMEAjAAMAoGCCqGSM49BAMCA0gAMEUCIQDLc+Io
+rg8VxEbCgVv8iH+kOIEn9MjhpvKzvwUoV+6rjQIgZU/RXAyc1a+H2+soGfNEIOBQ
+AzO3pJx7WJAApZuBX1Q=
+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+Certificate:
+    Data:
+        Version: 3 (0x2)
+        Serial Number: 0 (0x0)
+        Signature Algorithm: sha1WithRSAEncryption
+        Issuer: C=NL, O=PolarSSL, CN=PolarSSL Test CA
+        Validity
+            Not Before: Feb 12 14:44:00 2011 GMT
+            Not After : Feb 12 14:44:00 2021 GMT
+        Subject: C=NL, O=PolarSSL, CN=PolarSSL Test CA
+        Subject Public Key Info:
+            Public Key Algorithm: rsaEncryption
+            RSA Public Key: (2048 bit)
+                Modulus (2048 bit):
+                    00:c0:df:37:fc:17:bb:e0:96:9d:3f:86:de:96:32:
+                    7d:44:a5:16:a0:cd:21:f1:99:d4:ec:ea:cb:7c:18:
+                    58:08:94:a5:ec:9b:c5:8b:df:1a:1e:99:38:99:87:
+                    1e:7b:c0:8d:39:df:38:5d:70:78:07:d3:9e:d9:93:
+                    e8:b9:72:51:c5:ce:a3:30:52:a9:f2:e7:40:70:14:
+                    cb:44:a2:72:0b:c2:e5:40:f9:3e:e5:a6:0e:b3:f9:
+                    ec:4a:63:c0:b8:29:00:74:9c:57:3b:a8:a5:04:90:
+                    71:f1:bd:83:d9:3f:d6:a5:e2:3c:2a:8f:ef:27:60:
+                    c3:c6:9f:cb:ba:ec:60:7d:b7:e6:84:32:be:4f:fb:
+                    58:26:22:03:5b:d4:b4:d5:fb:f5:e3:96:2e:70:c0:
+                    e4:2e:bd:fc:2e:ee:e2:41:55:c0:34:2e:7d:24:72:
+                    69:cb:47:b1:14:40:83:7d:67:f4:86:f6:31:ab:f1:
+                    79:a4:b2:b5:2e:12:f9:84:17:f0:62:6f:27:3e:13:
+                    58:b1:54:0d:21:9a:73:37:a1:30:cf:6f:92:dc:f6:
+                    e9:fc:ac:db:2e:28:d1:7e:02:4b:23:a0:15:f2:38:
+                    65:64:09:ea:0c:6e:8e:1b:17:a0:71:c8:b3:9b:c9:
+                    ab:e9:c3:f2:cf:87:96:8f:80:02:32:9e:99:58:6f:
+                    a2:d5
+                Exponent: 65537 (0x10001)
+        X509v3 extensions:
+            X509v3 Basic Constraints: 
+                CA:TRUE
+            X509v3 Subject Key Identifier: 
+                B4:5A:E4:A5:B3:DE:D2:52:F6:B9:D5:A6:95:0F:EB:3E:BC:C7:FD:FF
+            X509v3 Authority Key Identifier: 
+                keyid:B4:5A:E4:A5:B3:DE:D2:52:F6:B9:D5:A6:95:0F:EB:3E:BC:C7:FD:FF
+                DirName:/C=NL/O=PolarSSL/CN=PolarSSL Test CA
+                serial:00
+
+    Signature Algorithm: sha1WithRSAEncryption
+        b8:fd:54:d8:00:54:90:8b:25:b0:27:dd:95:cd:a2:f7:84:07:
+        1d:87:89:4a:c4:78:11:d8:07:b5:d7:22:50:8e:48:eb:62:7a:
+        32:89:be:63:47:53:ff:b6:be:f1:2e:8c:54:c0:99:3f:a0:b9:
+        37:23:72:5f:0d:46:59:8f:d8:47:cd:97:4c:9f:07:0c:12:62:
+        09:3a:24:e4:36:d9:e9:2c:da:38:d0:73:75:61:d7:c1:6c:26:
+        8b:9b:e0:d5:dc:67:ed:8c:6b:33:d7:74:22:3c:4c:db:b5:8d:
+        2a:ce:2c:0d:08:59:05:09:05:a6:39:9f:b3:67:1b:e2:83:e5:
+        e1:8f:53:f6:67:93:c7:f9:6f:76:44:58:12:e8:3a:d4:97:e7:
+        e9:c0:3e:a8:7a:72:3d:87:53:1f:e5:2c:84:84:e7:9a:9e:7f:
+        66:d9:1f:9b:f5:13:48:b0:4d:14:d1:de:b2:24:d9:78:7d:f5:
+        35:cc:58:19:d1:d2:99:ef:4d:73:f8:1f:89:d4:5a:d0:52:ce:
+        09:f5:b1:46:51:6a:00:8e:3b:cc:6f:63:01:00:99:ed:9d:a6:
+        08:60:cd:32:18:d0:73:e0:58:71:d9:e5:d2:53:d7:8d:d0:ca:
+        e9:5d:2a:0a:0d:5d:55:ec:21:50:17:16:e6:06:4a:cd:5e:de:
+        f7:e0:e9:54
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/tests/data_files/server1_ca.crt b/tests/data_files/server1_ca.crt
new file mode 100644
index 0000000..748d944
--- /dev/null
+++ b/tests/data_files/server1_ca.crt
@@ -0,0 +1,41 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/tests/data_files/server7_int-ca_ca2.crt b/tests/data_files/server7_int-ca_ca2.crt
new file mode 100644
index 0000000..c289c0a
--- /dev/null
+++ b/tests/data_files/server7_int-ca_ca2.crt
@@ -0,0 +1,62 @@
+-----BEGIN CERTIFICATE-----
+MIIDwjCCAaqgAwIBAgIBEDANBgkqhkiG9w0BAQsFADBIMQswCQYDVQQGEwJOTDER
+MA8GA1UEChMIUG9sYXJTU0wxJjAkBgNVBAMTHVBvbGFyU1NMIFRlc3QgSW50ZXJt
+ZWRpYXRlIENBMB4XDTEzMDkyNDE2MTIyNFoXDTIzMDkyMjE2MTIyNFowNDELMAkG
+A1UEBhMCTkwxETAPBgNVBAoTCFBvbGFyU1NMMRIwEAYDVQQDEwlsb2NhbGhvc3Qw
+WTATBgcqhkjOPQIBBggqhkjOPQMBBwNCAAQcbffp2qXqoZyychmoCRxzrd4Vu96m
+47NPBehtEC46aTeXgDnBdf++znABrAtfXBRNQz8ARIeYBmskr22rlKjyo4GVMIGS
+MAkGA1UdEwQCMAAwHQYDVR0OBBYEFNIK06V3H85VsFxGoo5zbL+hYCa7MGYGA1Ud
+IwRfMF2AFDh32Gt3nCh3gotO2BupHveUFrcOoUKkQDA+MQswCQYDVQQGEwJOTDER
+MA8GA1UEChMIUG9sYXJTU0wxHDAaBgNVBAMTE1BvbGFyc3NsIFRlc3QgRUMgQ0GC
+AQ4wDQYJKoZIhvcNAQELBQADggIBADRoQ5fHKw+vkl0D3aqLX1XrZidb+25AWbhr
+FYXdaskN219PrXBL3cV8x5tK6qsPKSyyw1lue80OmhXs/w7PJkOHHUSWRnmTv7lr
+8Us3Zr/yOF/VVqzdGs7DlOTpyzEBdugI9uar/aCqHDoltN8wOduOoQB9aojYpROj
++gjlEO0mgt/87XpjYOig1o0jv44QYDQZQzpj1zeIn6WMe6xk9YDwCLMjRIpg++c7
+QyxvcEJTn80wX1SaEBM2gau97G7bORLMwBVkMT4oSY+iKYgpPpawOnMJbqUP73Dm
+yfJExDdrW/BbWZ/vKIcSqSZIbkHdkNjUDVHczyVwQxZxzvLFw/B1k9s7jYFsi5eK
+TNAdXFa4et1H2sd+uhu24GxsjmJioDrftixcgzPVBjDCjH8QWkBEX292WJ58on0e
+deWLpZUnzPdE1B4rsiPw1Vg28mGgr2O1xgBQr/fx6A+8ItNTzAXbZfEcult9ypwM
+0b6YDNe5IvdKk8iwz3mof0VNy47K6xoCaE/fxxWkjoXK8x2wfswGeP2QgUzQE93b
+OtjdHpsG1c7gIVFQmKATyAPUz4vqmezgNRleXU0oL0PYtoCmKQ51UjNMUfmO9xCj
+VJaNa2iTQ5Dgic+CW4TYAgj5/9g9X3WfwnDNxrZ0UxxawGElczHXqbrNleTtPaKp
+a8Si6UK5
+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/tests/data_files/test-int-ca3.crt b/tests/data_files/test-int-ca3.crt
new file mode 100644
index 0000000..7e724b2
--- /dev/null
+++ b/tests/data_files/test-int-ca3.crt
@@ -0,0 +1,12 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/tests/data_files/test-int-ca3.key b/tests/data_files/test-int-ca3.key
new file mode 100644
index 0000000..1bcc711
--- /dev/null
+++ b/tests/data_files/test-int-ca3.key
@@ -0,0 +1,8 @@
+-----BEGIN EC PARAMETERS-----
+BggqhkjOPQMBBw==
+-----END EC PARAMETERS-----
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEIC9zTt8jgjBlbq+qCsGj6uclaKLYBqxYSmUiuBdM1KG9oAoGCCqGSM49
+AwEHoUQDQgAE732fWHLNPMPsP1U1ibXvb55erlEVMlpXBGsj+KYwVqU1XCmW9Z9h
+hP7X/5js/DX92J/utoHyjUtVpQOzdTrbsQ==
+-----END EC PRIVATE KEY-----
diff --git a/tests/suites/test_suite_x509parse.data b/tests/suites/test_suite_x509parse.data
index 5bd2af4..e288394 100644
--- a/tests/suites/test_suite_x509parse.data
+++ b/tests/suites/test_suite_x509parse.data
@@ -699,6 +699,42 @@
 depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECDSA_C:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_SHA256_C:MBEDTLS_RSA_C
 x509_verify:"data_files/enco-cert-utf8str.pem":"data_files/enco-ca-prstr.pem":"data_files/crl_cat_rsa-ec.pem":"NULL":MBEDTLS_ERR_X509_CERT_VERIFY_FAILED:MBEDTLS_X509_BADCERT_BAD_KEY:"NULL"
 
+X509 Certificate verification callback: trusted EE cert
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECDSA_C:MBEDTLS_SHA256_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED
+x509_verify_callback:"data_files/server5-selfsigned.crt":"data_files/server5-selfsigned.crt":0:"depth 0 - serial 53\:A2\:CB\:4B\:12\:4E\:AD\:83\:7D\:A8\:94\:B2 - subject CN=selfsigned, OU=testing, O=PolarSSL, C=NL\n"
+
+X509 Certificate verification callback: simple
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_SHA1_C:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15
+x509_verify_callback:"data_files/server1.crt":"data_files/test-ca.crt":0:"depth 1 - serial 00 - subject C=NL, O=PolarSSL, CN=PolarSSL Test CA\ndepth 0 - serial 01 - subject C=NL, O=PolarSSL, CN=PolarSSL Server 1\n"
+
+X509 Certificate verification callback: two trusted roots
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_SHA1_C:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_ECDSA_C:MBEDTLS_ECP_DP_SECP384R1_ENABLED
+x509_verify_callback:"data_files/server1.crt":"data_files/test-ca_cat12.crt":0:"depth 1 - serial 00 - subject C=NL, O=PolarSSL, CN=PolarSSL Test CA\ndepth 0 - serial 01 - subject C=NL, O=PolarSSL, CN=PolarSSL Server 1\n"
+
+X509 Certificate verification callback: two trusted roots, reversed order
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_SHA1_C:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_ECDSA_C:MBEDTLS_ECP_DP_SECP384R1_ENABLED
+x509_verify_callback:"data_files/server1.crt":"data_files/test-ca_cat21.crt":0:"depth 1 - serial 00 - subject C=NL, O=PolarSSL, CN=PolarSSL Test CA\ndepth 0 - serial 01 - subject C=NL, O=PolarSSL, CN=PolarSSL Server 1\n"
+
+X509 Certificate verification callback: root included
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_SHA1_C:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_ECDSA_C:MBEDTLS_ECP_DP_SECP384R1_ENABLED
+x509_verify_callback:"data_files/server1_ca.crt":"data_files/test-ca_cat21.crt":0:"depth 1 - serial 00 - subject C=NL, O=PolarSSL, CN=PolarSSL Test CA\ndepth 0 - serial 01 - subject C=NL, O=PolarSSL, CN=PolarSSL Server 1\n"
+
+X509 Certificate verification callback: intermediate ca
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECDSA_C:MBEDTLS_RSA_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_PKCS1_V15:MBEDTLS_SHA256_C
+x509_verify_callback:"data_files/server7_int-ca.crt":"data_files/test-ca_cat12.crt":0:"depth 2 - serial C1\:43\:E2\:7E\:62\:43\:CC\:E8 - subject C=NL, O=PolarSSL, CN=Polarssl Test EC CA\ndepth 1 - serial 0E - subject C=NL, O=PolarSSL, CN=PolarSSL Test Intermediate CA\ndepth 0 - serial 10 - subject C=NL, O=PolarSSL, CN=localhost\n"
+
+X509 Certificate verification callback: intermediate ca, root included
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECDSA_C:MBEDTLS_RSA_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_PKCS1_V15:MBEDTLS_SHA256_C
+x509_verify_callback:"data_files/server7_int-ca_ca2.crt":"data_files/test-ca_cat12.crt":0:"depth 2 - serial C1\:43\:E2\:7E\:62\:43\:CC\:E8 - subject C=NL, O=PolarSSL, CN=Polarssl Test EC CA\ndepth 1 - serial 0E - subject C=NL, O=PolarSSL, CN=PolarSSL Test Intermediate CA\ndepth 0 - serial 10 - subject C=NL, O=PolarSSL, CN=localhost\n"
+
+X509 Certificate verification callback: two intermediates
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECDSA_C:MBEDTLS_RSA_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_PKCS1_V15:MBEDTLS_SHA256_C
+x509_verify_callback:"data_files/server10_int3_int-ca2.crt":"data_files/test-ca_cat21.crt":0:"depth 3 - serial 00 - subject C=NL, O=PolarSSL, CN=PolarSSL Test CA\ndepth 2 - serial 0F - subject C=NL, O=PolarSSL, CN=PolarSSL Test Intermediate EC CA\ndepth 1 - serial 4D - subject C=UK, O=mbed TLS, CN=mbed TLS Test intermediate CA 3\ndepth 0 - serial 4B - subject CN=localhost\n"
+
+X509 Certificate verification callback: two intermediates, root included
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECDSA_C:MBEDTLS_RSA_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_PKCS1_V15:MBEDTLS_SHA256_C
+x509_verify_callback:"data_files/server10_int3_int-ca2_ca.crt":"data_files/test-ca_cat21.crt":0:"depth 3 - serial 00 - subject C=NL, O=PolarSSL, CN=PolarSSL Test CA\ndepth 2 - serial 0F - subject C=NL, O=PolarSSL, CN=PolarSSL Test Intermediate EC CA\ndepth 1 - serial 4D - subject C=UK, O=mbed TLS, CN=mbed TLS Test intermediate CA 3\ndepth 0 - serial 4B - subject CN=localhost\n"
+
 X509 Parse Selftest
 depends_on:MBEDTLS_SHA1_C:MBEDTLS_PEM_PARSE_C:MBEDTLS_CERTS_C
 x509_selftest:
diff --git a/tests/suites/test_suite_x509parse.function b/tests/suites/test_suite_x509parse.function
index 1061d03..95fc287 100644
--- a/tests/suites/test_suite_x509parse.function
+++ b/tests/suites/test_suite_x509parse.function
@@ -26,6 +26,46 @@
     return 0;
 }
 
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+typedef struct {
+    char buf[512];
+    char *p;
+} verify_print_context;
+
+void verify_print_init( verify_print_context *ctx )
+{
+    memset( ctx, 0, sizeof( verify_print_context ) );
+    ctx->p = ctx->buf;
+}
+
+int verify_print( void *data, mbedtls_x509_crt *crt, int certificate_depth, uint32_t *flags )
+{
+    int ret;
+    verify_print_context *ctx = (verify_print_context *) data;
+    char *p = ctx->p;
+    size_t n = ctx->buf + sizeof( ctx->buf ) - ctx->p;
+    ((void) flags);
+
+    ret = mbedtls_snprintf( p, n, "depth %d - serial ", certificate_depth );
+    MBEDTLS_X509_SAFE_SNPRINTF;
+
+    ret = mbedtls_x509_serial_gets( p, n, &crt->serial );
+    MBEDTLS_X509_SAFE_SNPRINTF;
+
+    ret = mbedtls_snprintf( p, n, " - subject " );
+    MBEDTLS_X509_SAFE_SNPRINTF;
+
+    ret = mbedtls_x509_dn_gets( p, n, &crt->subject );
+    MBEDTLS_X509_SAFE_SNPRINTF;
+
+    ret = mbedtls_snprintf( p, n, "\n" );
+    MBEDTLS_X509_SAFE_SNPRINTF;
+
+    ctx->p = p;
+
+    return( 0 );
+}
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
 /* END_HEADER */
 
 /* BEGIN_DEPENDENCIES
@@ -164,6 +204,35 @@
 /* END_CASE */
 
 /* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C */
+void x509_verify_callback( char *crt_file, char *ca_file,
+                           int exp_ret, char *exp_vrfy_out )
+{
+    int ret;
+    mbedtls_x509_crt crt;
+    mbedtls_x509_crt ca;
+    uint32_t flags = 0;
+    verify_print_context vrfy_ctx;
+
+    mbedtls_x509_crt_init( &crt );
+    mbedtls_x509_crt_init( &ca );
+    verify_print_init( &vrfy_ctx );
+
+    TEST_ASSERT( mbedtls_x509_crt_parse_file( &crt, crt_file ) == 0 );
+    TEST_ASSERT( mbedtls_x509_crt_parse_file( &ca, ca_file ) == 0 );
+
+    ret = mbedtls_x509_crt_verify( &crt, &ca, NULL, NULL, &flags,
+                                   verify_print, &vrfy_ctx );
+
+    TEST_ASSERT( ret == exp_ret );
+    TEST_ASSERT( strcmp( vrfy_ctx.buf, exp_vrfy_out ) == 0 );
+
+exit:
+    mbedtls_x509_crt_free( &crt );
+    mbedtls_x509_crt_free( &ca );
+}
+/* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C */
 void mbedtls_x509_dn_gets( char *crt_file, char *entity, char *result_str )
 {
     mbedtls_x509_crt   crt;