Add test to check that sample() returns read-only collection

gstamatelat · Jul 31, 2021 · 3170054 · 3170054
1 parent 50d5383
commit 3170054
Showing 1 changed file with 11 additions and 0 deletions.
diff --git a/src/test/java/gr/james/sampling/RandomSamplingTest.java b/src/test/java/gr/james/sampling/RandomSamplingTest.java
@@ -193,6 +193,17 @@ public void sampleView() {
         Assert.assertTrue(RandomSamplingUtils.samplesEquals(sample, new HashSet<>(Arrays.asList(1, 2))));
     }
 
+    /**
+     * Check that the sample() method returns read-only collection.
+     */
+    @Test(expected = UnsupportedOperationException.class)
+    public void readOnlySample() {
+        final RandomSampling<Integer> rs = impl.get();
+        rs.feed(1);
+        rs.feed(2);
+        rs.sample().add(3);
+    }
+
     /**
      * {@link RandomSampling#streamSize()} correctness.
      */