testing: add image transformation tests

Author: gmitch215

core/src/js/main/dev/gmitch215/kasciffy/api/ImageJs.kt

@@ -46,14 +46,29 @@ class ImageJS internal constructor(
      */
     fun toDataURL(): String = canvas.toDataURL("image/$extension")
 
+    /**
+     * Converts this image to a [Blob].
+     * @return A promise that resolves to the [Blob] representation of this image.
+     */
+    fun toBlob(): Promise<Blob> = Promise { resolve, reject ->
+        canvas.toBlob({ blob ->
+            if (blob != null) {
+                resolve(blob)
+            } else {
+                reject(Error("Failed to convert canvas to blob"))
+            }
+        })
+    }
+
     /**
      * Asynchronously Asciffies this piece of media.
      * @param map The ASCII map to use for asciffying.
      * @param downScale The downscale factor to use when asciffying. This is used to reduce the size of the media, if necessary.
-     * If not specified, this is automatically calculated.
+     * If not specified, this is automatically calculated. On JavaScript, it is recommended to use a value of 2 or higher compared to
+     * on the JVM.
      * @return The asciffied version of this piece of media as a JavaScript promise.
      */
-    fun asciffy(map: String, downScale: Int? = null): Promise<ImageJS> = GlobalScope.promise {
+    fun asciffy(map: String, downScale: Int? = 2): Promise<ImageJS> = GlobalScope.promise {
         val asciffied = asciffy0(this@ImageJS, map, downScale)
         val canvas = toCanvas(asciffied, spaced = true, fontName = "Monospace", fontSize = 12)
         return@promise ImageJS(name, extension, creationDateDouble = creationDateDouble, canvas = canvas)
@@ -144,7 +159,7 @@ fun Image(binary: ByteArray, type: String): Promise<ImageJS> {
 internal fun toCanvas(output: String, spaced: Boolean = true, fontName: String = "Monospace", fontSize: Int = 12): HTMLCanvasElement {
     val canvas = document.createElement("canvas") as HTMLCanvasElement
     val ctx = canvas.getContext("2d") as CanvasRenderingContext2D
-    ctx.font = "$fontSize}px $fontName"
+    ctx.font = "${fontSize}px $fontName"
 
     val lines = output.split("\n")
     val lineHeight = fontSize * 1.2

core/src/js/test/dev/gmitch215/kasciffy/api/TestImageJs.kt

@@ -4,7 +4,9 @@ import kotlinx.browser.window
 import kotlinx.coroutines.await
 import kotlinx.coroutines.test.runTest
 import kotlin.test.Test
+import kotlin.test.assertEquals
 import kotlin.test.assertFalse
+import kotlin.test.assertNotNull
 import kotlin.test.assertTrue
 import kotlin.time.Duration.Companion.minutes
 
@@ -19,4 +21,16 @@ class TestImageJs {
         assertFalse { asciffy.isEmpty() }
     }
 
+    @Test
+    fun testTransform() = runTest(timeout = 10.minutes) {
+        val image = Image("${window.location.origin}/base/kotlin/gmitch215.png").await()
+        assertTrue { image.toDataURL().isNotEmpty() }
+
+        val transformed = image.asciffy(TEN_NUMERIC).await()
+        assertTrue { transformed.toDataURL().isNotEmpty() }
+        assertEquals(image.name, transformed.name)
+        assertEquals(image.extension, transformed.extension)
+        assertEquals(image.creationDateDouble, transformed.creationDateDouble)
+    }
+
 }

core/src/jvm/main/dev/gmitch215/kasciffy/api/ImageJVM.kt

@@ -58,7 +58,7 @@ class ImageJVM internal constructor(
      * If not specified, this is automatically calculated.
      * @return The asciffied version of this piece of media.
      */
-    suspend fun asciffy(map: String, downScale: Int?): Image {
+    suspend fun asciffy(map: String, downScale: Int? = null): Image {
         val asciffied = toPNG(asciffy0(this, map, downScale))
         return ImageJVM(name, extension, creationDate, asciffied)
     }

core/src/jvm/test/dev/gmitch215/kasciffy/api/TestImageJVM.kt

@@ -2,8 +2,10 @@ package dev.gmitch215.kasciffy.api
 
 import kotlinx.coroutines.test.runTest
 import org.junit.Test
+import kotlin.test.assertEquals
 import kotlin.test.assertFalse
 import kotlin.test.assertNotNull
+import kotlin.test.assertTrue
 
 class TestImageJVM {
 
@@ -16,4 +18,15 @@ class TestImageJVM {
         assertFalse { asciffy.isEmpty() }
     }
 
+    @Test
+    fun testTransform() = runTest {
+        val image = Image(javaClass.getResourceAsStream("/gmitch215.png")!!)
+        assertNotNull(image.bufferedImage)
+
+        val transformed = image.asciffy(TEN_NUMERIC, 1)
+        assertEquals(image.name, transformed.name)
+        assertEquals(image.extension, transformed.extension)
+        assertEquals(image.creationDate, transformed.creationDate)
+    }
+
 }

core/src/native/test/dev/gmitch215/kasciffy/api/TestImageNative.kt

@@ -2,7 +2,9 @@ package dev.gmitch215.kasciffy.api
 
 import kotlinx.coroutines.test.runTest
 import kotlin.test.Test
+import kotlin.test.assertEquals
 import kotlin.test.assertFalse
+import kotlin.test.assertNotNull
 import kotlin.test.assertTrue
 
 class TestImageNative {
@@ -16,7 +18,19 @@ class TestImageNative {
 
         val asciffy = asciffy0(image, TEN_NUMERIC, 1)
         assertFalse { asciffy.isEmpty() }
-        println(asciffy)
+    }
+
+    @Test
+    fun testTransformed() = runTest {
+        val image = Image("src/common/test-resources/gmitch215.png")
+        assertTrue { image.width > 0 }
+        assertTrue { image.height > 0 }
+        assertTrue { image.rgbValues.isNotEmpty() }
+
+        val transformed = image.asciffy(TEN_NUMERIC, 1)
+        assertEquals(image.name, transformed.name)
+        assertEquals(image.extension, transformed.extension)
+        assertEquals(image.creationDate, transformed.creationDate)
     }
 
 }