diff --git a/exercises/concept/cars-assemble/src/test/java/CarsAssembleTest.java b/exercises/concept/cars-assemble/src/test/java/CarsAssembleTest.java
index 8cdf0ee9c..4a032d60b 100644
--- a/exercises/concept/cars-assemble/src/test/java/CarsAssembleTest.java
+++ b/exercises/concept/cars-assemble/src/test/java/CarsAssembleTest.java
@@ -4,6 +4,7 @@
 import org.junit.jupiter.api.Test;
 
 import static org.assertj.core.api.Assertions.*;
+import static org.assertj.core.api.Assertions.within;
 
 
 public class CarsAssembleTest {
@@ -20,42 +21,42 @@ public void setUp() {
     @Tag("task:1")
     @DisplayName("The productionRatePerHour method returns the correct result when line's speed is 0")
     public void productionRatePerHourForSpeedZero() {
-        assertThat(Math.abs(carsAssemble.productionRatePerHour(0) - 0.0) < epsilon).isTrue();
+        assertThat(carsAssemble.productionRatePerHour(0)).isCloseTo(0.0, within(epsilon));
     }
 
     @Test
     @Tag("task:1")
     @DisplayName("The productionRatePerHour method returns the correct result when line's speed is 1")
     public void productionRatePerHourForSpeedOne() {
-        assertThat(Math.abs(carsAssemble.productionRatePerHour(1) - 221.0) < epsilon).isTrue();
+        assertThat(carsAssemble.productionRatePerHour(1)).isCloseTo(221.0, within(epsilon));
     }
 
     @Test
     @Tag("task:1")
     @DisplayName("The productionRatePerHour method returns the correct result when line's speed is 4")
     public void productionRatePerHourForSpeedFour() {
-        assertThat(Math.abs(carsAssemble.productionRatePerHour(4) - 884.0) < epsilon).isTrue();
+        assertThat(carsAssemble.productionRatePerHour(4)).isCloseTo(884.0, within(epsilon));
     }
 
     @Test
     @Tag("task:1")
     @DisplayName("The productionRatePerHour method returns the correct result when line's speed is 7")
     public void productionRatePerHourForSpeedSeven() {
-        assertThat(Math.abs(carsAssemble.productionRatePerHour(7) - 1392.3) < epsilon).isTrue();
+        assertThat(carsAssemble.productionRatePerHour(7)).isCloseTo(1392.3, within(epsilon));
     }
 
     @Test
     @Tag("task:1")
     @DisplayName("The productionRatePerHour method returns the correct result when line's speed is 9")
     public void productionRatePerHourForSpeedNine() {
-        assertThat(Math.abs(carsAssemble.productionRatePerHour(9) - 1591.2) < epsilon).isTrue();
+        assertThat(carsAssemble.productionRatePerHour(9)).isCloseTo(1591.2, within(epsilon));
     }
 
     @Test
     @Tag("task:1")
     @DisplayName("The productionRatePerHour method returns the correct result when line's speed is 10")
     public void productionRatePerHourForSpeedTen() {
-        assertThat(Math.abs(carsAssemble.productionRatePerHour(10) - 1701.7) < epsilon).isTrue();
+        assertThat(carsAssemble.productionRatePerHour(10)).isCloseTo(1701.7, within(epsilon));
     }
 
     @Test