test(05-04): add failing tests for attach File, Thumb, and bucket

- ThumbFilename/PartitionDirectory/File.Thumb behavior tests
- OpenBucket fail-loud and memblob tests
- Migrate empty plugin list must create system_files

lagoon/attach/thumb_test.go

@@ -0,0 +1,84 @@
+package attach
+
+import (
+	"bytes"
+	"image"
+	"image/color"
+	"image/jpeg"
+	"testing"
+
+	"gocloud.dev/blob"
+	"gocloud.dev/blob/memblob"
+)
+
+func TestThumbFilename(t *testing.T) {
+	got := ThumbFilename(42, 200, 200, 0, 0, "crop", "jpg")
+	const want = "thumb_42_200_200_0_0_crop.jpg"
+	if got != want {
+		t.Fatalf("ThumbFilename = %q, want %q", got, want)
+	}
+}
+
+func TestPartitionDirectory(t *testing.T) {
+	got := PartitionDirectory("abc123xyz.jpg")
+	const want = "abc/123/xyz/"
+	if got != want {
+		t.Fatalf("PartitionDirectory = %q, want %q", got, want)
+	}
+}
+
+func TestFileThumbResizesOnce(t *testing.T) {
+	ctx := t.Context()
+	bucket := memblob.OpenBucket(nil)
+	t.Cleanup(func() { _ = bucket.Close() })
+
+	f := &File{ID: 42, DiskName: "abc123xyz.jpg", FileName: "cover.jpg"}
+	origKey := PartitionDirectory(f.DiskName) + f.DiskName
+	if origKey == "abc123xyz.jpg" || origKey == "" {
+		// PartitionDirectory still stubbed — write under the Winter key the
+		// GREEN implementation will look up so this test stays the behavior spec.
+		origKey = "abc/123/xyz/" + f.DiskName
+	}
+	if err := bucket.WriteAll(ctx, origKey, testJPEG(t), &blob.WriterOptions{ContentType: "image/jpeg"}); err != nil {
+		t.Fatal(err)
+	}
+
+	var n int
+	orig := resizeImage
+	resizeImage = func(src image.Image, w, h int, mode string) image.Image {
+		n++
+		return orig(src, w, h, mode)
+	}
+	t.Cleanup(func() { resizeImage = orig })
+
+	url1, err := f.Thumb(ctx, bucket, 200, 200, "crop")
+	if err != nil {
+		t.Fatalf("first Thumb: %v", err)
+	}
+	url2, err := f.Thumb(ctx, bucket, 200, 200, "crop")
+	if err != nil {
+		t.Fatalf("second Thumb: %v", err)
+	}
+	if n != 1 {
+		t.Fatalf("resize calls = %d, want 1", n)
+	}
+	want := "/storage/uploads/abc/123/xyz/thumb_42_200_200_0_0_crop.jpg"
+	if url1 != want || url2 != want {
+		t.Fatalf("urls = %q %q, want %q", url1, url2, want)
+	}
+}
+
+func testJPEG(t *testing.T) []byte {
+	t.Helper()
+	img := image.NewRGBA(image.Rect(0, 0, 8, 8))
+	for y := 0; y < 8; y++ {
+		for x := 0; x < 8; x++ {
+			img.Set(x, y, color.RGBA{R: 200, A: 255})
+		}
+	}
+	var buf bytes.Buffer
+	if err := jpeg.Encode(&buf, img, &jpeg.Options{Quality: 90}); err != nil {
+		t.Fatal(err)
+	}
+	return buf.Bytes()
+}