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diff --git a/libccnx-common/ccnx/common/codec/testdata/testdata_common.h b/libccnx-common/ccnx/common/codec/testdata/testdata_common.h
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+++ b/libccnx-common/ccnx/common/codec/testdata/testdata_common.h
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+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+/*
+ *  testdata_common.h
+ *  TransportRTA
+ */
+
+#ifndef TransportRTA_testdata_common_h
+#define TransportRTA_testdata_common_h
+
+#include <ccnx/common/codec/ccnxCodec_Error.h>
+
+typedef struct tlv_extent {
+    uint16_t offset;
+    uint16_t length;
+} TlvExtent;
+
+// Equal to { 0xFFFF, 0xFFFF }
+extern const TlvExtent TlvExtentNotFound;
+
+/**
+ * Determine if two TlvExtent instances are equal.
+ *
+ * The following equivalence relations on non-null `TlvExtent` instances are maintained:
+ *
+ *  * It is reflexive: for any non-null reference value x, `TlvExtent_Equals(x, x)`
+ *      must return true.
+ *
+ *  * It is symmetric: for any non-null reference values x and y,
+ *    `tlvExtent_Equals(x, y)` must return true if and only if
+ *        `tlvExtent_Equals(y, x)` returns true.
+ *
+ *  * It is transitive: for any non-null reference values x, y, and z, if
+ *        `tlvExtent_Equals(x, y)` returns true and
+ *        `tlvExtent_Equals(y, z)` returns true,
+ *        then  `tlvExtent_Equals(x, z)` must return true.
+ *
+ *  * It is consistent: for any non-null reference values x and y, multiple
+ *      invocations of `tlvExtent_Equals(x, y)` consistently return true or
+ *      consistently return false.
+ *
+ *  * For any non-null reference value x, `tlvExtent_Equals(x, NULL)` must
+ *      return false.
+ *
+ * @param a A pointer to a `TlvExtent` instance.
+ * @param b A pointer to a `TlvExtent` instance.
+ * @return true if the two `TlvExtent` instances are equal.
+ *
+ * Example:
+ * @code
+ * {
+ *    TlvExtent *a = tlvExtent_Create();
+ *    TlvExtent *b = tlvExtent_Create();
+ *
+ *    if (tlvExtent_Equals(a, b)) {
+ *        // true
+ *    } else {
+ *        // false
+ *    }
+ * }
+ * @endcode
+ */
+bool tlvExtent_Equals(const TlvExtent *a, const TlvExtent *b);
+
+#define TRUTHTABLENAME(NAME) NAME ## _truthTableEntries
+
+// easy way to generate table entries, so long as you use the standard naming
+// convention for the the TruthTableEntry array
+#define TABLEENTRY(NAME, ERROR) { .testname = #NAME, .packet = NAME, .length = sizeof(NAME), .expectedError = ERROR, .entry = TRUTHTABLENAME(NAME) }
+
+typedef struct testrig_truth_table_entry {
+    bool wellKnownType;
+
+    // is the wellKnownType in the body manifest?  or the header?
+    bool bodyManifest;
+
+    // if its a well known type, this is the manifest array index
+    // otherwise, its the unknown type value
+    int indexOrKey;
+
+    TlvExtent extent;
+} TruthTableEntry;
+
+
+typedef struct testrig_truth_table {
+    const char *testname;
+    uint8_t *packet;
+    size_t length;
+
+    CCNxCodecErrorCodes expectedError;
+
+    // the array is terminated by a T_INVALID value
+    // for "arrayIndexOrTypeKey"
+    TruthTableEntry *entry;
+} TruthTable;
+
+#endif