Add tests for MissingChapters function

app/build.gradle.kts

@@ -251,7 +251,7 @@ dependencies {
     implementation(libs.bundles.shizuku)
 
     // Tests
-    testImplementation(libs.junit)
+    testImplementation(libs.bundles.test)
 
     // For detecting memory leaks; see https://square.github.io/leakcanary/
     // debugImplementation(libs.leakcanary.android)

app/src/main/java/eu/kanade/presentation/manga/MangaScreen.kt

@@ -65,7 +65,7 @@ import eu.kanade.tachiyomi.ui.manga.chapterDecimalFormat
 import eu.kanade.tachiyomi.util.lang.toRelativeString
 import eu.kanade.tachiyomi.util.system.copyToClipboard
 import tachiyomi.domain.chapter.model.Chapter
-import tachiyomi.domain.chapter.service.countMissingChapters
+import tachiyomi.domain.chapter.service.missingChaptersCount
 import tachiyomi.domain.manga.model.Manga
 import tachiyomi.domain.source.model.StubSource
 import tachiyomi.presentation.core.components.LazyColumn
@@ -394,7 +394,7 @@ private fun MangaScreenSmallImpl(
                         ChapterHeader(
                             enabled = chapters.fastAll { !it.selected },
                             chapterCount = chapters.size,
-                            missingChapterCount = countMissingChapters(chapters.map { it.chapter.chapterNumber }),
+                            missingChapterCount = chapters.map { it.chapter.chapterNumber }.missingChaptersCount(),
                             onClick = onFilterClicked,
                         )
                     }
@@ -606,7 +606,7 @@ fun MangaScreenLargeImpl(
                                 ChapterHeader(
                                     enabled = chapters.fastAll { !it.selected },
                                     chapterCount = chapters.size,
-                                    missingChapterCount = countMissingChapters(chapters.map { it.chapter.chapterNumber }),
+                                    missingChapterCount = chapters.map { it.chapter.chapterNumber }.missingChaptersCount(),
                                     onClick = onFilterButtonClicked,
                                 )
                             }

app/src/main/java/eu/kanade/presentation/manga/components/ChapterHeader.kt

@@ -14,13 +14,13 @@ import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import eu.kanade.tachiyomi.R
-import tachiyomi.presentation.core.util.secondaryItemAlpha
+import tachiyomi.presentation.core.components.material.SecondaryItemAlpha
 
 @Composable
 fun ChapterHeader(
     enabled: Boolean,
     chapterCount: Int?,
-    missingChapterCount: Int?,
+    missingChapterCount: Int,
     onClick: () -> Unit,
 ) {
     Column(
@@ -48,19 +48,16 @@ fun ChapterHeader(
 }
 
 @Composable
-private fun MissingChaptersWarning(count: Int?) {
-    val text = when {
-        count == null -> stringResource(R.string.missing_chapters_unknown)
-        count > 0 -> pluralStringResource(id = R.plurals.missing_chapters, count = count, count)
-        else -> return
+private fun MissingChaptersWarning(count: Int) {
+    if (count == 0) {
+        return
     }
 
     Text(
-        modifier = Modifier.secondaryItemAlpha(),
-        text = text,
+        text = pluralStringResource(id = R.plurals.missing_chapters, count = count, count),
         maxLines = 1,
         overflow = TextOverflow.Ellipsis,
         style = MaterialTheme.typography.bodySmall,
-        color = MaterialTheme.colorScheme.error,
+        color = MaterialTheme.colorScheme.error.copy(alpha = SecondaryItemAlpha),
     )
 }

domain/build.gradle.kts

@@ -21,5 +21,5 @@ dependencies {
 
     api(libs.sqldelight.android.paging)
 
-    testImplementation(libs.junit)
+    testImplementation(libs.bundles.test)
 }

domain/src/main/java/tachiyomi/domain/chapter/service/MissingChapters.kt

@@ -1,23 +1,21 @@
 package tachiyomi.domain.chapter.service
 
-import kotlin.math.floor
-
-fun countMissingChapters(chaptersInput: List<Float>): Int? {
-    if (chaptersInput.isEmpty()) {
+fun List<Float>.missingChaptersCount(): Int {
+    if (this.isEmpty()) {
         return 0
     }
 
-    val chapters = chaptersInput
-        // Remove any invalid chapters
-        .filter { it != -1f }
+    val chapters = this
+        // Ignore unknown chapter numbers
+        .filterNot { it == -1f }
         // Convert to integers, as we cannot check if 16.5 is missing
-        .map { floor(it.toDouble()).toInt() }
+        .map(Float::toInt)
         // Only keep unique chapters so that -1 or 16 are not counted multiple times
         .distinct()
         .sorted()
 
     if (chapters.isEmpty()) {
-        return null
+        return 0
     }
 
     var missingChaptersCount = 0

domain/src/test/java/tachiyomi/domain/chapter/service/MissingChaptersTest.kt

@@ -0,0 +1,30 @@
+package tachiyomi.domain.chapter.service
+
+import io.kotest.matchers.shouldBe
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.parallel.Execution
+import org.junit.jupiter.api.parallel.ExecutionMode
+
+@Execution(ExecutionMode.CONCURRENT)
+class MissingChaptersTest {
+
+    @Test
+    fun `returns 0 when empty list`() {
+        emptyList<Float>().missingChaptersCount() shouldBe 0
+    }
+
+    @Test
+    fun `returns 0 when all unknown chapter numbers`() {
+        listOf(-1f, -1f, -1f).missingChaptersCount() shouldBe 0
+    }
+
+    @Test
+    fun `handles repeated base chapter numbers`() {
+        listOf(1f, 1.0f, 1.1f, 1.5f, 1.6f, 1.99f).missingChaptersCount() shouldBe 0
+    }
+
+    @Test
+    fun `returns number of missing chapters`() {
+        listOf(-1f, 1f, 2f, 2.2f, 4f, 6f, 10f, 11f).missingChaptersCount() shouldBe 5
+    }
+}

gradle/libs.versions.toml

@@ -84,6 +84,7 @@ sqldelight-android-paging = { module = "com.squareup.sqldelight:android-paging3-
 sqldelight-gradle = { module = "com.squareup.sqldelight:gradle-plugin", version.ref = "sqldelight" }
 
 junit = "org.junit.jupiter:junit-jupiter:5.9.2"
+kotest-assertions = "io.kotest:kotest-assertions-core:5.5.5"
 
 voyager-navigator = { module = "ca.gosyer:voyager-navigator", version.ref = "voyager" }
 voyager-tab-navigator = { module = "ca.gosyer:voyager-tab-navigator", version.ref = "voyager" }
@@ -100,3 +101,4 @@ coil = ["coil-core", "coil-gif", "coil-compose"]
 shizuku = ["shizuku-api", "shizuku-provider"]
 voyager = ["voyager-navigator", "voyager-tab-navigator", "voyager-transitions"]
 richtext = ["richtext-commonmark", "richtext-m3"]
+test = ["junit", "kotest-assertions"]

i18n/src/main/res/values/strings.xml

@@ -617,7 +617,6 @@
         <item quantity="one">Missing %1$s chapter</item>
         <item quantity="other">Missing %1$s chapters</item>
     </plurals>
-    <string name="missing_chapters_unknown">Might be missing chapters</string>
     <string name="ongoing">Ongoing</string>
     <string name="unknown">Unknown</string>
     <string name="unknown_author">Unknown author</string>