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feat: adds StrengthMachine class including tests and a custom exception (#495)
* feat: adds StrengthMachine class including tests and a custom exception * fix: adds temporary adjusted package names in main and test folders * fix: adjusted package names in main and test folders
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‎lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/strengthmachine/MachineInUseException.java

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package com.codedifferently.lesson16.strengthmachine;
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public class MachineInUseException extends RuntimeException {
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public MachineInUseException(String message) {
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super(message);
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}
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}

‎lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/strengthmachine/StrengthMachine.java

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package com.codedifferently.lesson16.strengthmachine;
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import java.util.ArrayList;
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public class StrengthMachine {
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private String name;
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private int currentWeight;
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private boolean inUse;
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private ArrayList<String> safetyTips;
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private MuscleGroup targetMuscle;
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public enum MuscleGroup {
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SHOULDERS,
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CHEST,
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ARMS,
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LEGS,
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BACK
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}
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public StrengthMachine(
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String name,
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int currentWeight,
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boolean inUse,
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ArrayList<String> safetyTips,
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MuscleGroup targetMuscle) {
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this.name = name;
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this.currentWeight = currentWeight;
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this.inUse = inUse;
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this.safetyTips = safetyTips;
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this.targetMuscle = targetMuscle;
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}
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public StrengthMachine(String name, MuscleGroup targetMuscle) {
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this.name = name;
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this.currentWeight = 5;
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this.inUse = false;
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this.safetyTips = new ArrayList<>();
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this.targetMuscle = targetMuscle;
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}
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public boolean isAvailable() {
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return !inUse;
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}
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public void increaseWeightGradually(int targetWeight) {
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while (currentWeight < targetWeight) {
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currentWeight += 5;
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}
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}
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public void addSafetyTip(String tip) {
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safetyTips.add(tip);
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}
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public void useMachine() {
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if (isAvailable()) {
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inUse = true;
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} else {
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throw new MachineInUseException("Cannot use - Machine currently in use");
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}
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public int getCurrentWeight() {
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return currentWeight;
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}
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public void setCurrentWeight(int currentWeight) {
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this.currentWeight = currentWeight;
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}
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public boolean getInUse() {
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return inUse;
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}
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public void setInUse(boolean inUse) {
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this.inUse = inUse;
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}
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public ArrayList<String> getSafetyTips() {
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return safetyTips;
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}
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public void setSafetyTips(ArrayList<String> safetyTips) {
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this.safetyTips = safetyTips;
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}
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public MuscleGroup getTargetMuscle() {
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return targetMuscle;
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}
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public void setTargetMuscle(MuscleGroup targetMuscle) {
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this.targetMuscle = targetMuscle;
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}
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}

‎lesson_16/objects/objects_app/src/test/java/com/codedifferently/lesson16/strengthmachine/StrengthMachineTest.java

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package com.codedifferently.lesson16.strengthmachine;
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import static org.assertj.core.api.Assertions.assertThat;
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import static org.assertj.core.api.Assertions.assertThatThrownBy;
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import static org.junit.jupiter.api.Assertions.assertFalse;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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import com.codedifferently.lesson16.strengthmachine.StrengthMachine.MuscleGroup;
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import java.util.ArrayList;
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import java.util.Arrays;
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import org.junit.jupiter.api.BeforeEach;
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import org.junit.jupiter.api.Test;
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public class StrengthMachineTest {
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StrengthMachine strengthMachine;
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@BeforeEach
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void setUp() {
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strengthMachine =
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new StrengthMachine(
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"Leg Press",
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100,
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false,
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new ArrayList<>(Arrays.asList("Keep back straight.", "Use a spotter for heavy lifts.")),
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StrengthMachine.MuscleGroup.LEGS);
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}
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@Test
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public void testIsAvailableTrue() {
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assertTrue(strengthMachine.isAvailable());
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}
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@Test
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public void testIsAvailableFalse() {
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strengthMachine.useMachine();
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assertFalse(strengthMachine.isAvailable());
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}
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@Test
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public void testIncreaseWeightGradually() {
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strengthMachine.increaseWeightGradually(125);
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int actual = strengthMachine.getCurrentWeight();
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assertThat(actual).isEqualTo(125);
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}
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@Test
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public void testAddSafetyTip() {
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strengthMachine.addSafetyTip("Do not lock your joints.");
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assertThat(strengthMachine.getSafetyTips().size()).isEqualTo(3);
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}
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@Test
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public void testUseMachineAvailable() {
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strengthMachine.useMachine();
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assertFalse(strengthMachine.isAvailable());
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}
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@Test
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public void testUseMachineException() {
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strengthMachine.useMachine();
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assertThatThrownBy(() -> strengthMachine.useMachine())
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.isInstanceOf(MachineInUseException.class)
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.hasMessage("Cannot use - Machine currently in use");
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}
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@Test
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public void testGetName() {
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// Act
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String actual = strengthMachine.getName();
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// Assert
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assertThat(actual).isEqualTo("Leg Press");
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}
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@Test
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public void testSetName() {
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// Act
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strengthMachine.setName("Leg Curl");
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String actual = strengthMachine.getName();
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// Assert
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assertThat(actual).isEqualTo("Leg Curl");
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}
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@Test
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public void testGetCurrentWeight() {
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// Act
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int actual = strengthMachine.getCurrentWeight();
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// Assert
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assertThat(actual).isEqualTo(100);
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}
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@Test
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public void testSetCurrentWeight() {
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// Act
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strengthMachine.setCurrentWeight(150);
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int actual = strengthMachine.getCurrentWeight();
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// Assert
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assertThat(actual).isEqualTo(150);
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}
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@Test
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public void testGetInUse() {
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// Act
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boolean actual = strengthMachine.getInUse();
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// Assert
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assertThat(actual).isEqualTo(false);
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}
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@Test
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public void testSetInUse() {
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// Act
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strengthMachine.setInUse(true);
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boolean actual = strengthMachine.getInUse();
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// Assert
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assertThat(actual).isEqualTo(true);
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}
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@Test
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public void testGetSafetyTips() {
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// Act
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ArrayList<String> actual = strengthMachine.getSafetyTips();
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// Assert
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assertThat(actual.size()).isEqualTo(2);
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assertThat(actual.get(0)).isEqualTo("Keep back straight.");
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assertThat(actual.get(1)).isEqualTo("Use a spotter for heavy lifts.");
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}
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@Test
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public void testSetSafetyTips() {
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// Arrange
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ArrayList<String> newTips =
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new ArrayList<>(Arrays.asList("Bend knees slightly.", "Do not lock your joints."));
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// Act
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strengthMachine.setSafetyTips(newTips);
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ArrayList<String> actual = strengthMachine.getSafetyTips();
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// Assert
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assertThat(actual.size()).isEqualTo(2);
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assertThat(actual.get(0)).isEqualTo("Bend knees slightly.");
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assertThat(actual.get(1)).isEqualTo("Do not lock your joints.");
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}
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@Test
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public void testGetTargetMuscle() {
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// Act
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MuscleGroup actual = strengthMachine.getTargetMuscle();
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// Assert
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assertThat(actual).isEqualTo(StrengthMachine.MuscleGroup.LEGS);
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}
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@Test
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public void testSetTargetMuscle() {
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// Act
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strengthMachine.setTargetMuscle(StrengthMachine.MuscleGroup.BACK);
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MuscleGroup actual = strengthMachine.getTargetMuscle();
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// Assert
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assertThat(actual).isEqualTo(StrengthMachine.MuscleGroup.BACK);
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}
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}

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