feat(ranking): 반응형 폭 스케일을 추가한다

app/src/main/java/kr/co/vividnext/sodalive/v2/widget/ranking/RankingResponsiveScale.kt

@@ -0,0 +1,17 @@
+package kr.co.vividnext.sodalive.v2.widget.ranking
+
+import android.content.res.Resources
+
+object RankingResponsiveScale {
+    private const val BASE_WIDTH_DP = 402
+
+    fun fromResources(resources: Resources): Float = fromScreenWidthDp(resources.configuration.screenWidthDp)
+
+    fun fromScreenWidthDp(screenWidthDp: Int): Float {
+        return when {
+            screenWidthDp <= 0 -> 1f
+            screenWidthDp >= BASE_WIDTH_DP -> 1f
+            else -> screenWidthDp / BASE_WIDTH_DP.toFloat()
+        }
+    }
+}

app/src/test/java/kr/co/vividnext/sodalive/v2/widget/ranking/RankingResponsiveScaleTest.kt

@@ -0,0 +1,25 @@
+package kr.co.vividnext.sodalive.v2.widget.ranking
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class RankingResponsiveScaleTest {
+
+    @Test
+    fun `402dp 이상이면 scale 1을 반환한다`() {
+        assertEquals(1f, RankingResponsiveScale.fromScreenWidthDp(402), 0.0001f)
+        assertEquals(1f, RankingResponsiveScale.fromScreenWidthDp(430), 0.0001f)
+    }
+
+    @Test
+    fun `402dp 미만이면 device width와 기준 폭 비율을 반환한다`() {
+        assertEquals(360f / 402f, RankingResponsiveScale.fromScreenWidthDp(360), 0.0001f)
+        assertEquals(401f / 402f, RankingResponsiveScale.fromScreenWidthDp(401), 0.0001f)
+    }
+
+    @Test
+    fun `screen width를 확인할 수 없으면 scale 1을 반환한다`() {
+        assertEquals(1f, RankingResponsiveScale.fromScreenWidthDp(0), 0.0001f)
+        assertEquals(1f, RankingResponsiveScale.fromScreenWidthDp(-1), 0.0001f)
+    }
+}