[broken] Bumped junit4 to junit5

build.gradle

@@ -33,8 +33,8 @@ dependencies {
     implementation 'org.slf4j:slf4j-api:1.8.0-beta4'
     implementation 'org.apache.commons:commons-lang3:3.12.0'
 
-    testImplementation 'junit:junit-dep:4.10'
-    testImplementation "org.slf4j:slf4j-simple:1.8.0-beta4"
+    testImplementation 'org.junit.jupiter:junit-jupiter:5.9.2'
+    testImplementation 'org.hamcrest:hamcrest:2.2'
 }
 
 task sourcesJar(type: Jar) {
@@ -67,6 +67,8 @@ artifacts {
 }
 
 test {
+    useJUnitPlatform()
+
     testLogging {
         events "failed", "skipped"
         showStandardStreams = true

src/test/java/com/mojang/serialization/IntroCodecsRecordReaderTest.java

@@ -0,0 +1,23 @@
+package com.mojang.serialization;
+
+// Potential points for comment:
+// Introduce here a reference to scodec ?
+// Re-iterate on the dependencies between DFU s + Dynamics + Codecs here?
+
+import org.junit.jupiter.api.Test;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+
+record PlaceholderRecord(String name, int age) {}
+
+public class IntroCodecsRecordReaderTest {
+        public IntroCodecsRecordReaderTest() {}
+
+        // Define the Codec around here
+
+        @Test
+        public void FailOnPurpose() {
+                assertThat("Works", false, is(true));
+        }
+}

src/test/java/com/mojang/serialization/RoundtripTest.java

@@ -2,7 +2,7 @@
 
 import com.mojang.datafixers.util.Pair;
 import com.mojang.serialization.codecs.RecordCodecBuilder;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import java.util.Arrays;
 import java.util.List;
@@ -13,7 +13,8 @@
 import java.util.stream.Collectors;
 import java.util.stream.IntStream;
 
-import static org.junit.Assert.assertEquals;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.equalTo;
 
 public class RoundtripTest {
     // Constructors, equals and hashcode are auto-generated
@@ -249,7 +250,7 @@ private <T> void testWriteRead(final DynamicOps<T> ops) {
         final DataResult<T> encoded = TestData.CODEC.encodeStart(ops, data);
         final DataResult<TestData> decoded = encoded.flatMap(r -> TestData.CODEC.parse(ops, r));
 
-        assertEquals("read(write(x)) == x", DataResult.success(data), decoded);
+        assertThat("read(write(x)) == x", DataResult.success(data), equalTo(decoded));
     }
 
     private <T> void testReadWrite(final DynamicOps<T> ops) {
@@ -259,7 +260,7 @@ private <T> void testReadWrite(final DynamicOps<T> ops) {
         final DataResult<TestData> decoded = encoded.flatMap(r -> TestData.CODEC.parse(ops, r));
         final DataResult<T> reEncoded = decoded.flatMap(r -> TestData.CODEC.encodeStart(ops, r));
 
-        assertEquals("write(read(x)) == x", encoded, reEncoded);
+        assertThat("write(read(x)) == x", encoded, equalTo(reEncoded));
     }
 
     @Test