Use the @TestInstance annotation

interpreter/src/test/java/com/iluwatar/interpreter/ExpressionTest.java

@@ -23,6 +23,7 @@
 package com.iluwatar.interpreter;
 
 import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.TestInstance;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
 import org.junit.jupiter.params.provider.MethodSource;
@@ -43,6 +44,7 @@ import static org.junit.jupiter.api.Assertions.assertNotNull;
  * @param <E> Type of Expression
  * @author Jeroen Meulemeester
  */
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
 public abstract class ExpressionTest<E extends Expression> {
 
   /**
@@ -88,6 +90,13 @@ public abstract class ExpressionTest<E extends Expression> {
     this.factory = factory;
   }
 
+  /**
+   * Create a new set of test entries with the expected result
+   *
+   * @return The list of parameters used during this test
+   */
+  public abstract Stream<Arguments> expressionProvider();
+
   /**
    * Verify if the expression calculates the correct result when calling {@link E#interpret()}
    */

interpreter/src/test/java/com/iluwatar/interpreter/MinusExpressionTest.java

@@ -38,7 +38,8 @@ public class MinusExpressionTest extends ExpressionTest<MinusExpression> {
    *
    * @return The list of parameters used during this test
    */
-  public static Stream<Arguments> expressionProvider() {
+  @Override
+  public Stream<Arguments> expressionProvider() {
     return prepareParameters((f, s) -> f - s);
   }
 

interpreter/src/test/java/com/iluwatar/interpreter/MultiplyExpressionTest.java

@@ -38,7 +38,8 @@ public class MultiplyExpressionTest extends ExpressionTest<MultiplyExpression> {
    *
    * @return The list of parameters used during this test
    */
-  public static Stream<Arguments> expressionProvider() {
+  @Override
+  public Stream<Arguments> expressionProvider() {
     return prepareParameters((f, s) -> f * s);
   }
 

interpreter/src/test/java/com/iluwatar/interpreter/NumberExpressionTest.java

@@ -42,7 +42,8 @@ public class NumberExpressionTest extends ExpressionTest<NumberExpression> {
    *
    * @return The list of parameters used during this test
    */
-  public static Stream<Arguments> expressionProvider() {
+  @Override
+  public Stream<Arguments> expressionProvider() {
     return prepareParameters((f, s) -> f);
   }
 

interpreter/src/test/java/com/iluwatar/interpreter/PlusExpressionTest.java

@@ -38,7 +38,8 @@ public class PlusExpressionTest extends ExpressionTest<PlusExpression> {
    *
    * @return The list of parameters used during this test
    */
-  public static Stream<Arguments> expressionProvider() {
+  @Override
+  public Stream<Arguments> expressionProvider() {
     return prepareParameters((f, s) -> f + s);
   }