test: 补齐 handler/repository/domain 层单元测试

internal/pkg/pagination/pagination_test.go

@@ -0,0 +1,77 @@
+package pagination
+
+import (
+	"testing"
+)
+
+func TestDefaultPagination(t *testing.T) {
+	p := DefaultPagination()
+	if p.Page != 1 {
+		t.Errorf("expected default page 1, got %d", p.Page)
+	}
+	if p.PageSize != 20 {
+		t.Errorf("expected default page_size 20, got %d", p.PageSize)
+	}
+}
+
+func TestPaginationParams_Offset(t *testing.T) {
+	tests := []struct {
+		name       string
+		page       int
+		pageSize   int
+		wantOffset int
+	}{
+		{"page 1", 1, 20, 0},
+		{"page 2", 2, 20, 20},
+		{"page 5", 5, 20, 80},
+		{"zero page", 0, 20, 0},
+		{"negative page", -1, 20, 0},
+		{"page 1 size 10", 1, 10, 0},
+		{"page 3 size 10", 3, 10, 20},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			p := PaginationParams{Page: tc.page, PageSize: tc.pageSize}
+			if got := p.Offset(); got != tc.wantOffset {
+				t.Errorf("expected offset %d, got %d", tc.wantOffset, got)
+			}
+		})
+	}
+}
+
+func TestPaginationParams_Limit(t *testing.T) {
+	tests := []struct {
+		name     string
+		pageSize int
+		want     int
+	}{
+		{"default", 20, 20},
+		{"size 10", 10, 10},
+		{"size 50", 50, 50},
+		{"size 100", 100, 100},
+		{"max cap", 101, 100},
+		{"zero size", 0, 20},
+		{"negative size", -1, 20},
+		{"size 1", 1, 1},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			p := PaginationParams{PageSize: tc.pageSize}
+			if got := p.Limit(); got != tc.want {
+				t.Errorf("expected limit %d, got %d", tc.want, got)
+			}
+		})
+	}
+}
+
+func TestPaginationParams_OffsetAndLimit(t *testing.T) {
+	p := PaginationParams{Page: 3, PageSize: 15}
+	if got := p.Offset(); got != 30 {
+		t.Errorf("expected offset 30, got %d", got)
+	}
+	if got := p.Limit(); got != 15 {
+		t.Errorf("expected limit 15, got %d", got)
+	}
+}