assets builder tools (#39)

Reviewed-on: #39
Reviewed-by: xtul <mpiasecki720@protonmail.com>

internal/assets/dupes_test.go

@@ -0,0 +1,80 @@
+package assets
+
+import (
+	"bytes"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func touch(t *testing.T, path string) {
+	t.Helper()
+	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(path, []byte("x"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestCheckDupes(t *testing.T) {
+	root := t.TempDir()
+	touch(t, filepath.Join(root, "tex", "Foo.tga"))
+	touch(t, filepath.Join(root, "plc", "foo.tga")) // basename collision (case-insensitive)
+
+	var out, errw bytes.Buffer
+	if code := runCheckDupes([]string{root}, &out, &errw); code != exitFail {
+		t.Fatalf("collision exit = %d, want %d\n%s", code, exitFail, errw.String())
+	}
+
+	clean := t.TempDir()
+	touch(t, filepath.Join(clean, "a.tga"))
+	touch(t, filepath.Join(clean, "sub", "b.tga"))
+	out.Reset()
+	errw.Reset()
+	if code := runCheckDupes([]string{clean}, &out, &errw); code != exitOK {
+		t.Fatalf("no-collision exit = %d, want %d\n%s", code, exitOK, errw.String())
+	}
+}
+
+func TestCleanDupes(t *testing.T) {
+	primary := t.TempDir()
+	clean := t.TempDir()
+	touch(t, filepath.Join(primary, "keep.tga"))
+	collide := filepath.Join(clean, "sub", "Keep.tga")
+	survive := filepath.Join(clean, "unique.tga")
+	touch(t, collide)
+	touch(t, survive)
+
+	// dry-run removes nothing.
+	var out, errw bytes.Buffer
+	if code := runCleanDupes([]string{"--dry-run", primary, clean}, &out, &errw); code != exitOK {
+		t.Fatalf("dry-run exit = %d\n%s", code, errw.String())
+	}
+	if _, err := os.Stat(collide); err != nil {
+		t.Fatal("dry-run deleted a file")
+	}
+
+	// real run deletes the collision, keeps the unique file.
+	out.Reset()
+	errw.Reset()
+	if code := runCleanDupes([]string{primary, clean}, &out, &errw); code != exitOK {
+		t.Fatalf("clean exit = %d\n%s", code, errw.String())
+	}
+	if _, err := os.Stat(collide); !os.IsNotExist(err) {
+		t.Fatal("collision file was not deleted")
+	}
+	if _, err := os.Stat(survive); err != nil {
+		t.Fatal("unique file was wrongly deleted")
+	}
+}
+
+func TestCleanDupesRejectsOverlap(t *testing.T) {
+	root := t.TempDir()
+	sub := filepath.Join(root, "child")
+	touch(t, filepath.Join(sub, "x.tga"))
+	var out, errw bytes.Buffer
+	if code := runCleanDupes([]string{root, sub}, &out, &errw); code != exitUsage {
+		t.Fatalf("overlap exit = %d, want %d", code, exitUsage)
+	}
+}