diff --git a/src/test/java/gr/james/sampling/ChaoSamplingTest.java b/src/test/java/gr/james/sampling/ChaoSamplingTest.java
index 6798b33..544c9b2 100644
--- a/src/test/java/gr/james/sampling/ChaoSamplingTest.java
+++ b/src/test/java/gr/james/sampling/ChaoSamplingTest.java
@@ -23,11 +23,11 @@ public class ChaoSamplingTest {
     public void correctness() {
         final int[] d = new int[STREAM];
         for (int reps = 0; reps < REPS; reps++) {
-            final ChaoSampling<Integer> es = new ChaoSampling<>(SAMPLE, RANDOM);
+            final ChaoSampling<Integer> chao = new ChaoSampling<>(SAMPLE, RANDOM);
             for (int i = 0; i < STREAM; i++) {
-                es.feed(i, i + 1);
+                chao.feed(i, i + 1);
             }
-            for (int s : es.sample()) {
+            for (int s : chao.sample()) {
                 d[s]++;
             }
         }
diff --git a/src/test/java/gr/james/sampling/WeightedRandomSamplingTest.java b/src/test/java/gr/james/sampling/WeightedRandomSamplingTest.java
index 6429c03..3fbff20 100644
--- a/src/test/java/gr/james/sampling/WeightedRandomSamplingTest.java
+++ b/src/test/java/gr/james/sampling/WeightedRandomSamplingTest.java
@@ -43,11 +43,11 @@ public static Collection<Supplier<WeightedRandomSampling<Integer>>> implementati
     public void correctness() {
         final int[] d = new int[STREAM];
         for (int reps = 0; reps < REPS; reps++) {
-            final WeightedRandomSampling<Integer> es = impl.get();
+            final WeightedRandomSampling<Integer> alg = impl.get();
             for (int i = 0; i < STREAM; i++) {
-                es.feed(i, i + 1);
+                alg.feed(i, i + 1);
             }
-            for (int s : es.sample()) {
+            for (int s : alg.sample()) {
                 d[s]++;
             }
         }