diff --git a/tests/test_checkOptionsSource.m b/tests/test_checkOptionsSource.m
new file mode 100644
index 0000000..1d0f69a
--- /dev/null
+++ b/tests/test_checkOptionsSource.m
@@ -0,0 +1,51 @@
+function test_suite = test_checkOptionsSource %#ok<*STOUT>
+  try % assignment of 'localfunctions' is necessary in Matlab >= 2016
+    test_functions = localfunctions(); %#ok<*NASGU>
+  catch % no problem; early Matlab versions can use initTestSuite fine
+  end
+  initTestSuite;
+end
+
+function test_checkOptionsSourceBasic()
+
+  optSource.nbDummies = 0;
+  optSource = checkOptionsSource(optSource);
+
+  expectedOptionsSource = defaultOptionsSource();
+  expectedOptionsSource.nbDummies = 0;
+
+  assertEqual(optSource, expectedOptionsSource);
+
+end
+
+function test_checkOptionsSourceDoNotOverwrite()
+
+  optSource.dataType = 666;
+  optSource.someExtraField = 'test';
+  optSource.nbDummies = 42;
+
+  optSource = checkOptionsSource(optSource);
+
+  assertEqual(optSource.dataType, 666);
+  assertEqual(optSource.someExtraField, 'test');
+  assertEqual(optSource.nbDummies, 42);
+
+end
+
+function expectedOptionsSource = defaultOptionsSource()
+
+  expectedOptionsSource.sourceDir = '';
+
+  expectedOptionsSource.dataDir = '';
+
+  expectedOptionsSource.sequenceToIgnore = {};
+
+  expectedOptionsSource.dataType = 0;
+
+  expectedOptionsSource.zip = 0;
+
+  expectedOptionsSource.nbDummies = 0;
+
+  expectedOptionsSource.sequenceRmDummies = {};
+
+end