[Step1] 코틀린 기초

src/test/kotlin/study/Person.kt

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+package study
+
+data class Person(val name: String, val age: Int, var nickname: String? = name)

src/test/kotlin/study/PersonTest.kt

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+package study
+
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.jupiter.api.Test
+
+class PersonTest {
+    @Test
+    fun `이름 붙인 인자`() {
+        val actual = Person(name = "홍길동", nickname = "홍", age = 20)
+        assertThat(actual.name).isEqualTo("홍길동")
+        assertThat(actual.age).isEqualTo(20)
+        assertThat(actual.nickname).isEqualTo("길동")
+    }
+
+    @Test
+    fun `널 타입`() {
+        val actual = Person(name = "홍길동", nickname = null, age = 20)
+        assertThat(actual.nickname).isNull()
+    }
+
+    @Test
+    fun `기본 인자`() {
+        val actual = Person(name = "홍길동", age = 20)
+        assertThat(actual.nickname).isEqualTo("홍길동")
+    }
+
+    @Test
+    fun `데이터 클래스`() {
+        val actual1 = Person(name = "홍길동", age = 20)
+        val actual2 = Person(name = "홍길동", age = 20)
+        assertThat(actual1).isEqualTo(actual2)
+    }
+}

src/test/kotlin/study/StringTest.kt

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+package study
+
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.jupiter.api.Test
+
+class StringTest {
+    @Test
+    fun isBlank() {
+        val actual = "".isBlank()
+        assertThat("".isBlank()).isEqualTo(true)
+    }
+}