[BAEL-16045] - Renamed UserServiceIntegrationUnitTest to UserServiceUnitTest

java-strings-3/src/test/java/com/baeldung/stringdiff/StringDiffBenchmarkUnitTest.java

@@ -0,0 +1,73 @@
+package com.baeldung.stringdiff;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.commons.lang3.RandomStringUtils;
+import org.apache.commons.lang3.StringUtils;
+import org.bitbucket.cowwoc.diffmatchpatch.DiffMatchPatch;
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.runner.Runner;
+import org.openjdk.jmh.runner.RunnerException;
+import org.openjdk.jmh.runner.options.Options;
+import org.openjdk.jmh.runner.options.OptionsBuilder;
+
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.MILLISECONDS)
+@State(Scope.Benchmark)
+public class StringDiffBenchmarkUnitTest {
+
+    private DiffMatchPatch diffMatchPatch = new DiffMatchPatch();
+
+    private List<String> inputs = randomizeInputs(10000);
+
+    public static void main(String[] args) throws RunnerException {
+        Options opts = new OptionsBuilder().include(".*")
+            .warmupIterations(1)
+            .measurementIterations(50)
+            .jvmArgs("-Xms2g", "-Xmx2g")
+            .shouldDoGC(true)
+            .forks(1)
+            .build();
+
+        new Runner(opts).run();
+    }
+
+    @Benchmark
+    public int diffMatchPatch() {
+        for (int i = 0; i < inputs.size() - 1; i++) {
+            diffMatchPatch.diffMain(inputs.get(i), inputs.get(i + 1), false);
+        }
+        return inputs.size();
+    }
+
+    @Benchmark
+    public int stringUtils() {
+        for (int i = 0; i < inputs.size() - 1; i++) {
+            StringUtils.difference(inputs.get(i), inputs.get(i + 1));
+        }
+        return inputs.size();
+    }
+
+    /**
+     * Creates a list of a given size, containing 30 character long strings,
+     * each starting with a static prefix of 10 characters and followed by
+     * a random 20 character suffix
+     *
+     * @return a {@link List} of randomised strings
+     */
+    private List<String> randomizeInputs(int size) {
+        String staticPart = "ABCDEF1234";
+        List<String> inputs = new ArrayList<>();
+        for (int i = 0; i < size; i++) {
+            inputs.add(staticPart + RandomStringUtils.randomAlphabetic(20));
+        }
+        return inputs;
+    }
+}