test: ページネーション系のテストを追加

src/test/kotlin/dev/usbharu/hideout/application/infrastructure/exposed/PageTest.kt

@@ -0,0 +1,27 @@
+package dev.usbharu.hideout.application.infrastructure.exposed
+
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.jupiter.api.Assertions.*
+import org.junit.jupiter.api.Test
+
+class PageTest {
+    @Test
+    fun minIdが指定されているとsinceIdは無視される() {
+        val page = Page.of(1, 2, 3, 4)
+
+        assertThat(page.maxId).isEqualTo(1)
+        assertThat(page.sinceId).isNull()
+        assertThat(page.minId).isEqualTo(3)
+        assertThat(page.limit).isEqualTo(4)
+    }
+
+    @Test
+    fun minIdがnullのときはsinceIdが使われる() {
+        val page = Page.of(1, 2, null, 4)
+
+        assertThat(page.maxId).isEqualTo(1)
+        assertThat(page.minId).isNull()
+        assertThat(page.sinceId).isEqualTo(2)
+        assertThat(page.limit).isEqualTo(4)
+    }
+}

src/test/kotlin/dev/usbharu/hideout/application/infrastructure/exposed/PaginationListKtTest.kt

@@ -0,0 +1,48 @@
+package dev.usbharu.hideout.application.infrastructure.exposed
+
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.jupiter.api.Assertions.*
+import org.junit.jupiter.api.Test
+
+class PaginationListKtTest {
+    @Test
+    fun `toHttpHeader nextとprevがnullでない場合両方作成される`() {
+        val paginationList = PaginationList<String, Long>(emptyList(), 1, 2)
+
+        val httpHeader =
+            paginationList.toHttpHeader({ "https://example.com?max_id=$it" }, { "https://example.com?min_id=$it" })
+
+        assertThat(httpHeader).isEqualTo("<https://example.com?max_id=1>; rel=\"next\", <https://example.com?min_id=2>; rel=\"prev\"")
+    }
+
+    @Test
+    fun `toHttpHeader nextがnullなら片方だけ作成される`() {
+        val paginationList = PaginationList<String, Long>(emptyList(), 1,null)
+
+        val httpHeader =
+            paginationList.toHttpHeader({ "https://example.com?max_id=$it" }, { "https://example.com?min_id=$it" })
+
+        assertThat(httpHeader).isEqualTo("<https://example.com?max_id=1>; rel=\"next\"")
+    }
+
+    @Test
+    fun `toHttpHeader prevがnullなら片方だけ作成される`() {
+        val paginationList = PaginationList<String, Long>(emptyList(), null,2)
+
+        val httpHeader =
+            paginationList.toHttpHeader({ "https://example.com?max_id=$it" }, { "https://example.com?min_id=$it" })
+
+        assertThat(httpHeader).isEqualTo("<https://example.com?min_id=2>; rel=\"prev\"")
+    }
+
+    @Test
+    fun `toHttpHeader 両方nullならnullが返ってくる`() {
+        val paginationList = PaginationList<String, Long>(emptyList(), null, null)
+
+
+        val httpHeader =
+            paginationList.toHttpHeader({ "https://example.com?max_id=$it" }, { "https://example.com?min_id=$it" })
+
+        assertThat(httpHeader).isNull()
+    }
+}