test: add download, store, and scraper tests

internal/download/options_test.go

@@ -0,0 +1,39 @@
+package download
+
+import (
+	"testing"
+	"time"
+)
+
+func TestOptionsValidate(t *testing.T) {
+	valid := Options{Quality: "mp3_320", Timeout: time.Minute, Limit: 10}
+
+	tests := []struct {
+		name    string
+		mutate  func(o *Options)
+		wantErr bool
+	}{
+		{"valid", func(o *Options) {}, false},
+		{"mp3_128", func(o *Options) { o.Quality = "mp3_128" }, false},
+		{"flac", func(o *Options) { o.Quality = "flac" }, false},
+		{"invalid quality", func(o *Options) { o.Quality = "ogg" }, true},
+		{"uppercase quality", func(o *Options) { o.Quality = "MP3_320" }, true},
+		{"zero timeout", func(o *Options) { o.Timeout = 0 }, true},
+		{"negative timeout", func(o *Options) { o.Timeout = -time.Second }, true},
+		{"zero limit", func(o *Options) { o.Limit = 0 }, true},
+		{"limit too high", func(o *Options) { o.Limit = 101 }, true},
+		{"limit at max", func(o *Options) { o.Limit = 100 }, false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			opts := valid
+			tt.mutate(&opts)
+
+			err := opts.Validate()
+			if (err != nil) != tt.wantErr {
+				t.Errorf("Validate() error = %v, wantErr %v", err, tt.wantErr)
+			}
+		})
+	}
+}