diff --git a/.gitignore b/.gitignore
index 62ec7a6..505a2e9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,7 +6,12 @@ build/
 !**/src/test/**/build/
 
 ### IntelliJ IDEA ###
-.idea/
+!.idea/
+.idea/*
+!.idea/google-java-format.xml
+!.idea/codeStyles/
+.idea/codeStyles/*
+!.idea/codeStyles/codeStyleConfig.xml
 *.iml
 *.ipr
 *.iws
diff --git a/.idea/codeStyles/codeStyleConfig.xml b/.idea/codeStyles/codeStyleConfig.xml
new file mode 100644
index 0000000..b9d18bf
--- /dev/null
+++ b/.idea/codeStyles/codeStyleConfig.xml
@@ -0,0 +1,5 @@
+<component name="ProjectCodeStyleConfiguration">
+  <state>
+    <option name="PREFERRED_PROJECT_CODE_STYLE" value="GoogleStyle" />
+  </state>
+</component>
\ No newline at end of file
diff --git a/.idea/google-java-format.xml b/.idea/google-java-format.xml
new file mode 100644
index 0000000..8b57f45
--- /dev/null
+++ b/.idea/google-java-format.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GoogleJavaFormatSettings">
+    <option name="enabled" value="true" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/build.gradle.kts b/build.gradle.kts
index 4816c81..2cb9f50 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -54,6 +54,7 @@ dependencies {
 
     testImplementation(platform("org.junit:junit-bom:$junitVersion"))
     testImplementation("org.junit.jupiter:junit-jupiter")
+    implementation("io.github.hakky54:logcaptor:2.12.7")
     testRuntimeOnly("org.junit.platform:junit-platform-launcher")
 }
 
diff --git a/config/pmd/ruleset.xml b/config/pmd/ruleset.xml
index 98fd784..3b1c7fd 100644
--- a/config/pmd/ruleset.xml
+++ b/config/pmd/ruleset.xml
@@ -13,6 +13,8 @@
     <rule ref="category/java/bestpractices.xml">
         <!-- slf4j's parameterized logging ({}) makes isDebugEnabled()-style guards unnecessary. -->
         <exclude name="GuardLogStatement"/>
+        <exclude name="UnitTestContainsTooManyAsserts"/>
+        <exclude name="UnitTestAssertionsShouldIncludeMessage"/>
     </rule>
     <rule ref="category/java/errorprone.xml"/>
     <rule ref="category/java/design.xml">
diff --git a/src/int-test/java/com/example/app/AppIntegrationTest.java b/src/int-test/java/com/example/app/AppIntegrationTest.java
index 045b91e..270b764 100644
--- a/src/int-test/java/com/example/app/AppIntegrationTest.java
+++ b/src/int-test/java/com/example/app/AppIntegrationTest.java
@@ -1,13 +1,30 @@
 package com.example.app;
 
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
+import nl.altindag.log.LogCaptor;
 import org.junit.jupiter.api.Test;
 
 class AppIntegrationTest {
 
+  private final LogCaptor logCaptor = LogCaptor.forClass(App.class);
+
   @Test
   void mainRunsWithoutThrowing() {
     assertDoesNotThrow(() -> App.main(new String[] {}));
   }
+
+  @Test
+  void mainLogsGreeting() {
+    App.main(new String[] {});
+    assertEquals("Hello, world!", logCaptor.getInfoLogs().getFirst());
+  }
+
+  @Test
+  void mainNoErrorMessages() {
+    App.main(new String[] {});
+    assertTrue(logCaptor.getErrorLogs().isEmpty());
+  }
 }