diff --git a/bundles/org.eclipse.passage.lic.api/src/org/eclipse/passage/lic/api/conditions/ConditionTransport.java b/bundles/org.eclipse.passage.lic.api/src/org/eclipse/passage/lic/api/conditions/ConditionTransport.java
index bd9056c31..a938f444e 100644
--- a/bundles/org.eclipse.passage.lic.api/src/org/eclipse/passage/lic/api/conditions/ConditionTransport.java
+++ b/bundles/org.eclipse.passage.lic.api/src/org/eclipse/passage/lic/api/conditions/ConditionTransport.java
@@ -20,18 +20,20 @@
  * Transport interface for {@link LicensingCondition}(s).
  *
  * @since 0.4.0
+ * @deprecated use {@code lic.internal.api.ConditionTransport}
  */
+@Deprecated
 public interface ConditionTransport {
 
 	/**
-	 * Reads {@link LicensingCondition}(s) from the given {@link InputStream}. 
+	 * Reads {@link LicensingCondition}(s) from the given {@link InputStream}.
 	 *
 	 * @since 0.4.0
 	 */
 	Iterable<LicensingCondition> readConditions(InputStream input) throws IOException;
 
 	/**
-	 * Writes {@link LicensingCondition}(s) from the given {@link OutputStream}. 
+	 * Writes {@link LicensingCondition}(s) from the given {@link OutputStream}.
 	 *
 	 * @since 0.4.0
 	 */
diff --git a/tests/org.eclipse.passage.lic.api.tests/src/org/eclipse/passage/lic/api/tests/conditions/mining/ConditionTransportContractTest.java b/tests/org.eclipse.passage.lic.api.tests/src/org/eclipse/passage/lic/api/tests/conditions/mining/ConditionTransportContractTest.java
new file mode 100644
index 000000000..99ccaccb7
--- /dev/null
+++ b/tests/org.eclipse.passage.lic.api.tests/src/org/eclipse/passage/lic/api/tests/conditions/mining/ConditionTransportContractTest.java
@@ -0,0 +1,82 @@
+/*******************************************************************************
+ * Copyright (c) 2020 ArSysOp
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * https://www.eclipse.org/legal/epl-2.0/.
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *     ArSysOp - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.passage.lic.api.tests.conditions.mining;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assume.assumeTrue;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+import org.eclipse.passage.lic.internal.api.conditions.Condition;
+import org.eclipse.passage.lic.internal.api.conditions.mining.ConditionTransport;
+import org.junit.Test;
+
+@SuppressWarnings("restriction")
+public abstract class ConditionTransportContractTest {
+
+	@Test(expected = NullPointerException.class)
+	public void conditionsAreMandatory() throws IOException {
+		transport().write(null, new ByteArrayOutputStream());
+	}
+
+	@Test
+	public void readYourOwnWritings() throws IOException {
+		// given
+		Collection<Condition> sedentaries = conditions();
+		assumeTrue("Too few: supply at least two test conditions for transportation", sedentaries.size() > 1); //$NON-NLS-1$
+		ConditionTransport transport = transport();
+		// when
+		String serialized = write(transport, sedentaries);
+		Collection<Condition> nomads = read(transport, serialized);
+		// then
+		assertEquals(new HashSet<>(textual(sedentaries)), new HashSet<>(textual(nomads)));
+	}
+
+	private String write(ConditionTransport transport, Collection<Condition> conditions) throws IOException {
+		ByteArrayOutputStream output = new ByteArrayOutputStream();
+		transport.write(conditions, output);
+		return new String(output.toByteArray());
+	}
+
+	private Collection<Condition> read(ConditionTransport transport, String source) throws IOException {
+		return transport.read(new ByteArrayInputStream(source.getBytes()));
+	}
+
+	private Set<String> textual(Collection<Condition> conditions) {
+		return conditions.stream()//
+				.map(this::textual) //
+				.collect(Collectors.toSet());
+	}
+
+	/**
+	 * Provide any textual representation of a condition that distinguishes two
+	 * instances with differing content.
+	 */
+	protected abstract String textual(Condition condition);
+
+	/**
+	 * Produce new instance of a transport under test
+	 */
+	protected abstract ConditionTransport transport();
+
+	/**
+	 * Supply as least two test condition for transportation
+	 */
+	protected abstract Collection<Condition> conditions();
+}