feat(home): 팔로잉 인증 헤더를 추가한다

app/src/main/java/kr/co/vividnext/sodalive/v2/main/home/model/HomeFollowingAuthHeader.kt

@@ -0,0 +1,6 @@
+package kr.co.vividnext.sodalive.v2.main.home.model
+
+fun homeFollowingAuthHeader(token: String): String? = token
+    .trim()
+    .takeIf { it.isNotEmpty() }
+    ?.let { "Bearer $it" }

app/src/test/java/kr/co/vividnext/sodalive/v2/main/home/HomeFollowingAuthHeaderTest.kt

@@ -0,0 +1,25 @@
+package kr.co.vividnext.sodalive.v2.main.home
+
+import kr.co.vividnext.sodalive.v2.main.home.model.homeFollowingAuthHeader
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertNull
+import org.junit.Test
+
+class HomeFollowingAuthHeaderTest {
+
+    @Test
+    fun `blank token은 null을 반환한다`() {
+        assertNull(homeFollowingAuthHeader(""))
+        assertNull(homeFollowingAuthHeader("   "))
+    }
+
+    @Test
+    fun `non blank token은 Bearer header를 반환한다`() {
+        assertEquals("Bearer token-1", homeFollowingAuthHeader("token-1"))
+    }
+
+    @Test
+    fun `token 앞뒤 공백은 trim 후 Bearer header를 반환한다`() {
+        assertEquals("Bearer token-1", homeFollowingAuthHeader("  token-1  "))
+    }
+}