diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c2065bc
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,37 @@
+HELP.md
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..d570537
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,36 @@
+plugins {
+    id 'java'
+    id 'org.springframework.boot' version '3.1.4'
+    id 'io.spring.dependency-management' version '1.1.3'
+}
+
+group = 'com.example'
+version = '0.0.1-SNAPSHOT'
+
+java {
+    sourceCompatibility = '17'
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    compileOnly 'org.jetbrains:annotations:24.0.1'
+    implementation 'org.springframework.boot:spring-boot-starter-web'
+    implementation 'org.mybatis.spring.boot:mybatis-spring-boot-starter:3.0.2'
+    compileOnly 'org.projectlombok:lombok:1.18.30'
+    annotationProcessor 'org.projectlombok:lombok:1.18.30'
+    runtimeOnly("mysql:mysql-connector-java:8.0.33")
+
+    testCompileOnly 'org.projectlombok:lombok:1.18.30'
+    testAnnotationProcessor 'org.projectlombok:lombok:1.18.30'
+    testImplementation 'org.junit.jupiter:junit-jupiter:5.9.2'
+    testImplementation 'org.springframework.boot:spring-boot-starter-test'
+    testImplementation 'org.mybatis.spring.boot:mybatis-spring-boot-starter-test:3.0.2'
+    testImplementation 'org.assertj:assertj-core:3.24.2'
+}
+
+tasks.named('test') {
+    useJUnitPlatform()
+}
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..033e24c
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.jar
Binary files differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..9f4197d
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.2.1-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100755
index 0000000..fcb6fca
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,248 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..6689b85
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,92 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 0000000..3d5cf41
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1 @@
+rootProject.name = 'TestSample'
diff --git a/src/main/java/com/example/testsample/Sample1DomainService.java b/src/main/java/com/example/testsample/Sample1DomainService.java
new file mode 100644
index 0000000..c2c3cc8
--- /dev/null
+++ b/src/main/java/com/example/testsample/Sample1DomainService.java
@@ -0,0 +1,10 @@
+package com.example.testsample;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class Sample1DomainService {
+  public Sample1Entity findById(Long id) {
+    return new Sample1Entity(id, "Taro", 2L);
+  }
+}
diff --git a/src/main/java/com/example/testsample/Sample1Entity.java b/src/main/java/com/example/testsample/Sample1Entity.java
new file mode 100644
index 0000000..c69f86a
--- /dev/null
+++ b/src/main/java/com/example/testsample/Sample1Entity.java
@@ -0,0 +1,6 @@
+package com.example.testsample;
+
+public record Sample1Entity(Long id, String name, Long sample2Id) {
+
+}
+
diff --git a/src/main/java/com/example/testsample/Sample2DomainService.java b/src/main/java/com/example/testsample/Sample2DomainService.java
new file mode 100644
index 0000000..6be8e43
--- /dev/null
+++ b/src/main/java/com/example/testsample/Sample2DomainService.java
@@ -0,0 +1,11 @@
+package com.example.testsample;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class Sample2DomainService {
+
+  public Sample2Entity findById(Long id) {
+    return new Sample2Entity(id, "Apple");
+  }
+}
diff --git a/src/main/java/com/example/testsample/Sample2Entity.java b/src/main/java/com/example/testsample/Sample2Entity.java
new file mode 100644
index 0000000..abd28e5
--- /dev/null
+++ b/src/main/java/com/example/testsample/Sample2Entity.java
@@ -0,0 +1,5 @@
+package com.example.testsample;
+
+public record Sample2Entity(Long id, String name) {
+
+}
diff --git a/src/main/java/com/example/testsample/SampleAppService.java b/src/main/java/com/example/testsample/SampleAppService.java
new file mode 100644
index 0000000..1edaee2
--- /dev/null
+++ b/src/main/java/com/example/testsample/SampleAppService.java
@@ -0,0 +1,31 @@
+package com.example.testsample;
+
+import org.jetbrains.annotations.VisibleForTesting;
+import org.springframework.stereotype.Service;
+
+@Service
+public class SampleAppService {
+
+  private final Sample1DomainService sample1DomainService;
+  private final Sample2DomainService sample2DomainService;
+
+  public SampleAppService(
+      final Sample1DomainService sample1DomainService,
+      final Sample2DomainService sample2DomainService) {
+    this.sample1DomainService = sample1DomainService;
+    this.sample2DomainService = sample2DomainService;
+  }
+
+  public SampleResponse hoge() {
+    final var e1 = sample1DomainService.findById(1L);
+    final var e2 = sample2DomainService.findById(2L);
+    return convert(e1, e2);
+  }
+
+  @VisibleForTesting
+  static SampleResponse convert(
+      final Sample1Entity sample1,
+      final Sample2Entity sample2) {
+    return new SampleResponse(sample1.id(), sample1.name(), sample2.name());
+  }
+}
diff --git a/src/main/java/com/example/testsample/SampleController.java b/src/main/java/com/example/testsample/SampleController.java
new file mode 100644
index 0000000..8a8149d
--- /dev/null
+++ b/src/main/java/com/example/testsample/SampleController.java
@@ -0,0 +1,22 @@
+package com.example.testsample;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("sample")
+public class SampleController {
+
+  private final SampleAppService sampleService;
+
+  public SampleController(final SampleAppService sampleService) {
+    this.sampleService = sampleService;
+  }
+
+  @GetMapping
+  public ResponseEntity<SampleResponse> get() {
+    return ResponseEntity.ok(sampleService.hoge());
+  }
+}
diff --git a/src/main/java/com/example/testsample/SampleResponse.java b/src/main/java/com/example/testsample/SampleResponse.java
new file mode 100644
index 0000000..2eeb10c
--- /dev/null
+++ b/src/main/java/com/example/testsample/SampleResponse.java
@@ -0,0 +1,5 @@
+package com.example.testsample;
+
+public record SampleResponse(Long id, String sample1Name, String sample2Name) {
+
+}
diff --git a/src/main/java/com/example/testsample/TestSampleApplication.java b/src/main/java/com/example/testsample/TestSampleApplication.java
new file mode 100644
index 0000000..05d1ee3
--- /dev/null
+++ b/src/main/java/com/example/testsample/TestSampleApplication.java
@@ -0,0 +1,12 @@
+package com.example.testsample;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class TestSampleApplication {
+
+  public static void main(String[] args) {
+    SpringApplication.run(TestSampleApplication.class, args);
+  }
+}
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
new file mode 100644
index 0000000..e511399
--- /dev/null
+++ b/src/main/resources/application.yml
@@ -0,0 +1,4 @@
+spring:
+  datasource:
+    driver-class-name: com.mysql.cj.jdbc.Driver
+    url: jdbc:mysql://127.0.0.1/sample
diff --git a/src/test/java/com/example/testsample/SampleAppServiceIntegrationTest.java b/src/test/java/com/example/testsample/SampleAppServiceIntegrationTest.java
new file mode 100644
index 0000000..8fa61cd
--- /dev/null
+++ b/src/test/java/com/example/testsample/SampleAppServiceIntegrationTest.java
@@ -0,0 +1,26 @@
+package com.example.testsample;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+public class SampleAppServiceIntegrationTest {
+
+  @Autowired
+  private SampleAppService sampleService;
+
+  @Test
+  public void test() {
+    // Arrange
+    // (DB初期化処理)
+    // Act
+    final var result = sampleService.hoge();
+    // assert
+    assertThat(result.id()).isEqualTo(1L);
+    assertThat(result.sample1Name()).isEqualTo("Taro");
+    assertThat(result.sample2Name()).isEqualTo("Apple");
+  }
+}
diff --git a/src/test/java/com/example/testsample/SampleAppServiceUnitTest.java b/src/test/java/com/example/testsample/SampleAppServiceUnitTest.java
new file mode 100644
index 0000000..4c941ad
--- /dev/null
+++ b/src/test/java/com/example/testsample/SampleAppServiceUnitTest.java
@@ -0,0 +1,70 @@
+package com.example.testsample;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyLong;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+@ExtendWith(MockitoExtension.class)
+public class SampleAppServiceUnitTest {
+
+  @InjectMocks
+  private SampleAppService sampleAppService;
+  @Mock
+  private Sample1DomainService sample1DomainService;
+  @Mock
+  private Sample2DomainService sample2DomainService;
+
+  private static Fixture[] fixtures() {
+    return new Fixture[]{
+        new Fixture(
+            new Sample1Entity(1L, "Taro", 2L),
+            new Sample2Entity(2L, "Apple"),
+            new SampleResponse(1L, "Taro", "Apple"))
+    };
+  }
+
+  @Test
+  public void test() {
+    // Arrange
+    when(sample1DomainService.findById(any()))
+        .thenReturn(new Sample1Entity(1L, "Taro", 2L));
+    when(sample2DomainService.findById(any()))
+        .thenReturn(new Sample2Entity(2L, "Apple"));
+    // Act
+    final var result = sampleAppService.hoge();
+    // Assert
+    assertThat(result.id()).isEqualTo(1L);
+    assertThat(result.sample1Name()).isEqualTo("Taro");
+    assertThat(result.sample2Name()).isEqualTo("Apple");
+    verify(sample1DomainService, times(1))
+        .findById(anyLong());
+    verify(sample2DomainService, times(1))
+        .findById(anyLong());
+  }
+
+  @MethodSource("fixtures")
+  @ParameterizedTest
+  public void parameterizedTest(final Fixture fixture) {
+    assertThat(SampleAppService.convert(fixture.sample1, fixture.sample2))
+        .isEqualTo(fixture.response);
+  }
+
+  private record Fixture(
+      Sample1Entity sample1,
+      Sample2Entity sample2,
+      SampleResponse response
+  ) {
+
+  }
+}