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diff --git a/src/intervalstore/impl/SimpleFeature.java b/src/intervalstore/impl/SimpleFeature.java
new file mode 100644
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--- /dev/null
+++ b/src/intervalstore/impl/SimpleFeature.java
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+/*
+BSD 3-Clause License
+
+Copyright (c) 2018, Mungo Carstairs
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of the copyright holder nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+package intervalstore.impl;
+
+import intervalstore.api.IntervalI;
+
+/**
+ * A simplified feature instance sufficient for unit test purposes
+ */
+public class SimpleFeature extends Range
+{
+
+  private String description;
+
+
+  /**
+   * Constructor
+   * 
+   * @param from
+   * @param to
+   * @param desc
+   */
+  public SimpleFeature(int from, int to, String desc)
+  {
+    super(from, to);
+    description = desc;
+  }
+
+  /**
+   * Copy constructor
+   * 
+   * @param sf1
+   */
+  public SimpleFeature(SimpleFeature sf1)
+  {
+    this(sf1.start, sf1.end, sf1.description);
+  }
+
+  public String getDescription()
+  {
+    return description;
+  }
+
+  @Override
+  public int hashCode()
+  {
+    return start + 37 * end
+            + (description == null ? 0 : description.hashCode());
+  }
+
+  @Override
+  public boolean equals(Object o)
+  {
+    return (o != null && o instanceof SimpleFeature
+            && equalsInterval((SimpleFeature) o));
+  }
+
+  /**
+   * Equals method that requires two instances to have the same description, as
+   * well as start and end position. Does not do a test for null
+   */
+  @Override
+  public boolean equalsInterval(IntervalI o)
+  {
+    // must override equalsInterval, not equals
+    return (o != null && start == ((SimpleFeature) o).start
+            && end == ((SimpleFeature) o).end)
+            && (description == null
+                    ? ((SimpleFeature) o).description == null
+                    : description.equals(((SimpleFeature) o).description));
+  }
+
+  @Override
+  public String toString()
+  {
+    return start + ":" + end + ":" + description;
+  }
+
+
+}