Clarify precedence in MapUtils#merge() (#983)

src/com/sap/piper/MapUtils.groovy

@@ -20,6 +20,12 @@ class MapUtils implements Serializable {
         return result
     }
 
+    /**
+     * Merge two maps with the second one has precedence
+     * @param base First map
+     * @param overlay Second map, takes precedence
+     * @return The merged map
+     */
     static Map merge(Map base, Map overlay) {
 
         Map result = [:]

test/groovy/com/sap/piper/MapUtilsTest.groovy

@@ -16,7 +16,7 @@ class MapUtilsTest {
     }
 
     @Test
-    void testMergeMapStraigtForward(){
+    void testMergeMapStraightForward(){
 
         Map a = [a: '1',
                  c: [d: '1',
@@ -31,6 +31,20 @@ class MapUtilsTest {
                           c: [d: 'x', e: '2']]
     }
 
+    @Test
+    void testMergeMapWithConflict(){
+
+        Map a = [a: '1',
+                 b: [c: 1]],
+            b = [a: '2',
+                 b: [c: 2]]
+
+        Map merged = MapUtils.merge(a, b)
+
+        assert merged == [a: '2',
+                          b: [c: 2]]
+    }
+
     @Test
     void testPruneNulls() {