refactoring : shotgun surgery - inline function

refactoring/src/main/java/com/example/refactoring/_08_shotgun_surgery/_28_inline_function/Driver.java

@@ -0,0 +1,14 @@
+package com.example.refactoring._08_shotgun_surgery._28_inline_function;
+
+public class Driver {
+
+    private int numberOfLateDeliveries;
+
+    public Driver(int numberOfLateDeliveries) {
+        this.numberOfLateDeliveries = numberOfLateDeliveries;
+    }
+
+    public int getNumberOfLateDeliveries() {
+        return this.numberOfLateDeliveries;
+    }
+}

refactoring/src/main/java/com/example/refactoring/_08_shotgun_surgery/_28_inline_function/Rating.java

@@ -0,0 +1,9 @@
+package com.example.refactoring._08_shotgun_surgery._28_inline_function;
+
+public class Rating {
+
+    public int rating(Driver driver) {
+        return driver.getNumberOfLateDeliveries() > 5 ? 2 : 1;
+    }
+
+}

refactoring/src/main/java/com/example/refactoring/_08_shotgun_surgery/_28_inline_function/_before/Driver.java

@@ -0,0 +1,14 @@
+package com.example.refactoring._08_shotgun_surgery._28_inline_function._before;
+
+public class Driver {
+
+    private int numberOfLateDeliveries;
+
+    public Driver(int numberOfLateDeliveries) {
+        this.numberOfLateDeliveries = numberOfLateDeliveries;
+    }
+
+    public int getNumberOfLateDeliveries() {
+        return this.numberOfLateDeliveries;
+    }
+}

refactoring/src/main/java/com/example/refactoring/_08_shotgun_surgery/_28_inline_function/_before/Rating.java

@@ -0,0 +1,12 @@
+package com.example.refactoring._08_shotgun_surgery._28_inline_function._before;
+
+public class Rating {
+
+    public int rating(Driver driver) {
+        return moreThanFiveLateDeliveries(driver) ? 2 : 1;
+    }
+
+    private boolean moreThanFiveLateDeliveries(Driver driver) {
+        return driver.getNumberOfLateDeliveries() > 5;
+    }
+}

refactoring/src/test/java/com/example/refactoring/_08_shotgun_surgery/_28_inline_function/RatingTest.java

@@ -0,0 +1,16 @@
+package com.example.refactoring._08_shotgun_surgery._28_inline_function;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class RatingTest {
+
+    @Test
+    void rating() {
+        Rating rating = new Rating();
+        assertEquals(2, rating.rating(new Driver(15)));
+        assertEquals(1, rating.rating(new Driver(3)));
+    }
+
+}