Added a couple of tests for ImageController

src/test/kotlin/uk/co/neviyn/booru/ImageControllerTest.kt

@@ -0,0 +1,52 @@
+package uk.co.neviyn.booru
+
+import org.junit.jupiter.api.Test
+
+import org.mockito.Mockito
+import org.mockito.Mockito.doReturn
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc
+import org.springframework.boot.test.context.SpringBootTest
+import org.springframework.boot.test.mock.mockito.MockBean
+import org.springframework.data.domain.PageImpl
+import org.springframework.data.domain.PageRequest
+import org.springframework.test.web.servlet.MockMvc
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders
+import org.springframework.test.web.servlet.result.MockMvcResultMatchers
+
+
+@SpringBootTest
+@AutoConfigureMockMvc
+internal class ImageControllerTest {
+
+    @Autowired
+    lateinit var mockMvc: MockMvc
+
+    @MockBean
+    lateinit var imageRepository: ImageRepository
+
+    @Test
+    fun `get an empty gallery page`(){
+        mockMvc.perform(MockMvcRequestBuilders.get("/gallery"))
+            .andExpect(MockMvcResultMatchers.status().isOk)
+            .andExpect(MockMvcResultMatchers.view().name("gallery"))
+            .andExpect(MockMvcResultMatchers.model().attribute("imagePage", null))
+            .andExpect(MockMvcResultMatchers.model().attribute("commonTags", null))
+            .andExpect(MockMvcResultMatchers.model().attribute("pageNumber", null))
+    }
+
+    @Test
+    fun `get a gallery page with a single page of images`() {
+        val images = listOf(
+            Image(id = 1, filename = "image1.jpg"),
+            Image(id = 2, filename = "image2.jpg")
+        )
+        val page = PageImpl(images)
+        doReturn(page).`when`(imageRepository).findAll(Mockito.any(PageRequest::class.java))
+        mockMvc.perform(MockMvcRequestBuilders.get("/gallery"))
+            .andExpect(MockMvcResultMatchers.status().isOk)
+            .andExpect(MockMvcResultMatchers.view().name("gallery"))
+            .andExpect(MockMvcResultMatchers.model().attribute("imagePage", page))
+            .andExpect(MockMvcResultMatchers.model().attribute("pageNumber", 1))
+    }
+}