Made my AliBob Engine work

AliceAndBobEngine.java

@@ -10,7 +10,10 @@ public class AliceAndBobEngine {
      * @return `true` if `input` is "Alice"
      */
     public Boolean isAlice(String input) {
-        return null;
+        if (input == "Alice") {
+            return true;
+        } else {
+            return false;}
     }
 
     /**
@@ -19,7 +22,10 @@ public Boolean isAlice(String input) {
      * @return `true` if `input` is "Bob"
      */
     public Boolean isBob(String input) {
-        return null;
+        if (input == "Bob") {
+            return true;
+        } else {
+        return false;}
     }
 
     /**
@@ -28,7 +34,10 @@ public Boolean isBob(String input) {
      * @return `true` if `input` is "Alice" or "Bob"
      */
     public Boolean isAliceOrBob(String input) {
-        return null;
+        if (input == "Alice" || input == "Bob") {
+            return true;
+        } else {
+        return false;}
     }
 
     /**
@@ -42,6 +51,10 @@ public Boolean isAliceOrBob(String input) {
      * @return respective String value
      */
     public String getGreeting(String input) {
-        return null;
+
+        if (input == "Alice" || input == "Bob") {
+            return "Hello, " + input + "!";
+        } else {
+        return "Begone, "+ input +"! You're a stranger!";}
     }
 }

package.bluej

@@ -1,32 +1,78 @@
 #BlueJ package file
-editor.fx.0.height=0
-editor.fx.0.width=0
-editor.fx.0.x=0
-editor.fx.0.y=0
+dependency1.from=IsAliceOrBobTest
+dependency1.to=AliceAndBobEngine
+dependency1.type=UsesDependency
+dependency2.from=IsBobTest
+dependency2.to=AliceAndBobEngine
+dependency2.type=UsesDependency
+dependency3.from=IsAliceTest
+dependency3.to=AliceAndBobEngine
+dependency3.type=UsesDependency
+dependency4.from=GetGreetingTest
+dependency4.to=AliceAndBobEngine
+dependency4.type=UsesDependency
+editor.fx.0.height=722
+editor.fx.0.width=800
+editor.fx.0.x=320
+editor.fx.0.y=56
 objectbench.height=101
 objectbench.width=776
 package.divider.horizontal=0.6
 package.divider.vertical=0.8007380073800738
 package.editor.height=427
-package.editor.width=674
+package.editor.width=682
 package.editor.x=181
 package.editor.y=109
 package.frame.height=600
 package.frame.width=800
-package.numDependencies=0
-package.numTargets=1
+package.numDependencies=4
+package.numTargets=6
 package.showExtends=true
 package.showUses=true
 project.charset=UTF-8
-readme.height=58
+readme.height=60
 readme.name=@README
-readme.width=47
+readme.width=48
 readme.x=10
 readme.y=10
-target1.height=50
-target1.name=Main
+target1.height=70
+target1.name=IsAliceTest
 target1.showInterface=false
-target1.type=ClassTarget
-target1.width=80
-target1.x=70
-target1.y=10
+target1.type=UnitTestTargetJunit4
+target1.width=120
+target1.x=10
+target1.y=80
+target2.height=70
+target2.name=IsBobTest
+target2.showInterface=false
+target2.type=UnitTestTargetJunit4
+target2.width=120
+target2.x=140
+target2.y=90
+target3.height=70
+target3.name=IsAliceOrBobTest
+target3.showInterface=false
+target3.type=UnitTestTargetJunit4
+target3.width=120
+target3.x=10
+target3.y=160
+target4.height=70
+target4.name=AliceAndBobEngine
+target4.showInterface=false
+target4.type=ClassTarget
+target4.width=130
+target4.x=140
+target4.y=170
+target5.height=70
+target5.name=README.md
+target5.type=TextTarget
+target5.width=120
+target5.x=140
+target5.y=10
+target6.height=70
+target6.name=GetGreetingTest
+target6.showInterface=false
+target6.type=UnitTestTargetJunit4
+target6.width=120
+target6.x=10
+target6.y=240