diff --git a/chapter18/section72/go.mod b/chapter18/section72/go.mod
index cdb319a..4c10a44 100644
--- a/chapter18/section72/go.mod
+++ b/chapter18/section72/go.mod
@@ -13,6 +13,7 @@ require (
 require filippo.io/edwards25519 v1.1.0 // indirect
 
 require (
+	github.com/DATA-DOG/go-sqlmock v1.5.2
 	github.com/gabriel-vasile/mimetype v1.4.3 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
diff --git a/chapter18/section72/go.sum b/chapter18/section72/go.sum
index 2dc26ff..f175479 100644
--- a/chapter18/section72/go.sum
+++ b/chapter18/section72/go.sum
@@ -1,5 +1,7 @@
 filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
 filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
+github.com/DATA-DOG/go-sqlmock v1.5.2 h1:OcvFkGmslmlZibjAjaHm3L//6LiuBgolP7OputlJIzU=
+github.com/DATA-DOG/go-sqlmock v1.5.2/go.mod h1:88MAG/4G7SMwSE3CeA0ZKzrT5CiOU3OJ+JlNzwDqpNU=
 github.com/caarlos0/env/v6 v6.10.1 h1:t1mPSxNpei6M5yAeu1qtRdPAK29Nbcf/n3G7x+b3/II=
 github.com/caarlos0/env/v6 v6.10.1/go.mod h1:hvp/ryKXKipEkcuYjs9mI4bBCg+UI0Yhgm5Zu0ddvwc=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
@@ -22,6 +24,7 @@ github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/jmoiron/sqlx v1.4.0 h1:1PLqN7S1UYp5t4SrVVnt4nUVNemrDAtxlulVe+Qgm3o=
 github.com/jmoiron/sqlx v1.4.0/go.mod h1:ZrZ7UsYB/weZdl2Bxg6jCRO9c3YHl8r3ahlKmRT4JLY=
+github.com/kisielk/sqlstruct v0.0.0-20201105191214-5f3e10d3ab46/go.mod h1:yyMNCyc/Ib3bDTKd379tNMpB/7/H5TjM2Y9QJ5THLbE=
 github.com/leodido/go-urn v1.4.0 h1:WT9HwE9SGECu3lg4d/dIA+jxlljEa1/ffXKmRjqdmIQ=
 github.com/leodido/go-urn v1.4.0/go.mod h1:bvxc+MVxLKB4z00jd1z+Dvzr47oO32F/QSNjSBOlFxI=
 github.com/lib/pq v1.10.9/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
diff --git a/chapter18/section72/store/task_test.go b/chapter18/section72/store/task_test.go
new file mode 100644
index 0000000..079727a
--- /dev/null
+++ b/chapter18/section72/store/task_test.go
@@ -0,0 +1,110 @@
+package store
+
+import (
+	"context"
+	"testing"
+
+	"github.com/DATA-DOG/go-sqlmock"
+	"github.com/google/go-cmp/cmp"
+	"github.com/jmoiron/sqlx"
+	"github.com/myeunee/GolangStudy/chapter18/section72/clock"
+	"github.com/myeunee/GolangStudy/chapter18/section72/entity"
+	"github.com/myeunee/GolangStudy/chapter18/section72/testutil"
+)
+
+func prepareTasks(ctx context.Context, t *testing.T, con Execer) entity.Tasks {
+	t.Helper()
+	// 깨끗한 상태로 정리
+	if _, err := con.ExecContext(ctx, "DELETE FROM task;"); err != nil {
+		t.Logf("failed to initialize task: %v", err)
+	}
+	c := clock.FixedClocker{}
+	wants := entity.Tasks{
+		{
+			Title: "want task 1", Status: "todo",
+			Created: c.Now(), Modified: c.Now(),
+		},
+		{
+			Title: "want task 2", Status: "todo",
+			Created: c.Now(), Modified: c.Now(),
+		},
+		{
+			Title: "want task 3", Status: "done",
+			Created: c.Now(), Modified: c.Now(),
+		},
+	}
+	result, err := con.ExecContext(ctx,
+		`INSERT INTO task (title, status, created, modified)
+			VALUES
+			    (?, ?, ?, ?),
+			    (?, ?, ?, ?),
+			    (?, ?, ?, ?);`,
+		wants[0].Title, wants[0].Status, wants[0].Created, wants[0].Modified,
+		wants[1].Title, wants[1].Status, wants[1].Created, wants[1].Modified,
+		wants[2].Title, wants[2].Status, wants[2].Created, wants[2].Modified,
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+	id, err := result.LastInsertId()
+	if err != nil {
+		t.Fatal(err)
+	}
+	wants[0].ID = entity.TaskID(id)
+	wants[1].ID = entity.TaskID(id + 1)
+	wants[2].ID = entity.TaskID(id + 2)
+	return wants
+}
+
+func TestRepository_ListTasks(t *testing.T) {
+	ctx := context.Background()
+	// entity.Task를 작성하는 다른 테스트 케이스와 섞이면 테스트가 실패함
+	// 이를 위해 트랜잭션을 적용 -> 테스트 케이스 내로 한정된 테이블 상태를 만듬
+	tx, err := testutil.OpenDBForTest(t).BeginTxx(ctx, nil)
+	// 이 테스트 케이스가 끝나면 원래 상태로 되돌림
+	t.Cleanup(func() { _ = tx.Rollback() })
+	if err != nil {
+		t.Fatal(err)
+	}
+	wants := prepareTasks(ctx, t, tx)
+
+	sut := &Repository{}
+	gots, err := sut.ListTasks(ctx, tx)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if d := cmp.Diff(gots, wants); len(d) != 0 {
+		t.Errorf("differs: (-got +want)\n%s", d)
+	}
+}
+
+func TestRepository_AddTask(t *testing.T) {
+	t.Parallel()
+	ctx := context.Background()
+
+	c := clock.FixedClocker{}
+	var wantID int64 = 20
+	okTask := &entity.Task{
+		Title:    "ok task",
+		Status:   "todo",
+		Created:  c.Now(),
+		Modified: c.Now(),
+	}
+
+	db, mock, err := sqlmock.New()
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() { _ = db.Close() })
+	mock.ExpectExec(
+		// 이스케이프 필요
+		`INSERT INTO task \(title, status, created, modified\) VALUES \(\?, \?, \?, \?\)`,
+	).WithArgs(okTask.Title, okTask.Status, okTask.Created, okTask.Modified).
+		WillReturnResult(sqlmock.NewResult(wantID, 1))
+
+	xdb := sqlx.NewDb(db, "mysql")
+	r := &Repository{Clocker: c}
+	if err := r.AddTask(ctx, xdb, okTask); err != nil {
+		t.Errorf("want no error, but got %v", err)
+	}
+}
diff --git a/chapter18/section72/testutil/db.go b/chapter18/section72/testutil/db.go
new file mode 100644
index 0000000..36c1055
--- /dev/null
+++ b/chapter18/section72/testutil/db.go
@@ -0,0 +1,29 @@
+package testutil
+
+import (
+	"database/sql"
+	"fmt"
+	"os"
+	"testing"
+
+	_ "github.com/go-sql-driver/mysql"
+	"github.com/jmoiron/sqlx"
+)
+
+func OpenDBForTest(t *testing.T) *sqlx.DB {
+	port := 33306
+	if _, defined := os.LookupEnv("CI"); defined {
+		port = 3306
+	}
+	db, err := sql.Open(
+		"mysql",
+		fmt.Sprintf("todo:todo@tcp(127.0.0.1:%d)/todo?parseTime=true", port),
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(
+		func() { _ = db.Close() },
+	)
+	return sqlx.NewDb(db, "mysql")
+}