test pagination

pkg/pagination/pagination.go

@@ -1,10 +1,20 @@
 package pagination
 
 func GetOffsetAndLimit(page, pageSize *int) (offset, limit int) {
+
+	if page != nil && *page <= 0 {
+		page = nil
+	}
+
+	if pageSize != nil && *pageSize < 0 {
+		pageSize = nil
+	}
+
 	if page == nil || pageSize == nil {
 		limit = -1
 		offset = 0
 	} else {
+
 		offset = (*page - 1) * *pageSize
 		limit = *pageSize
 	}

pkg/pagination/pagination_test.go

@@ -0,0 +1,80 @@
+package pagination
+
+import "testing"
+
+func TestGetOffsetAndLimit(t *testing.T) {
+	type args struct {
+		page     *int
+		pageSize *int
+	}
+	tests := []struct {
+		name       string
+		args       args
+		wantOffset int
+		wantLimit  int
+	}{
+		{
+			name:       "Both nil",
+			args:       args{nil, nil},
+			wantOffset: 0,
+			wantLimit:  -1,
+		},
+		{
+			name:       "Nil page",
+			args:       args{nil, ptr(10)},
+			wantOffset: 0,
+			wantLimit:  -1,
+		},
+		{
+			name:       "Nil pageSize",
+			args:       args{ptr(2), nil},
+			wantOffset: 0,
+			wantLimit:  -1,
+		},
+		{
+			name:       "First page",
+			args:       args{ptr(1), ptr(10)},
+			wantOffset: 0,
+			wantLimit:  10,
+		},
+		{
+			name:       "Second page",
+			args:       args{ptr(2), ptr(10)},
+			wantOffset: 10,
+			wantLimit:  10,
+		},
+		{
+			name:       "Third page",
+			args:       args{ptr(3), ptr(5)},
+			wantOffset: 10,
+			wantLimit:  5,
+		},
+		{
+			name:       "Zero page",
+			args:       args{ptr(0), ptr(10)},
+			wantOffset: 0,
+			wantLimit:  -1,
+		},
+		{
+			name:       "Negative page",
+			args:       args{ptr(-1), ptr(10)},
+			wantOffset: 0,
+			wantLimit:  -1,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			gotOffset, gotLimit := GetOffsetAndLimit(tt.args.page, tt.args.pageSize)
+			if gotOffset != tt.wantOffset {
+				t.Errorf("GetOffsetAndLimit() gotOffset = %v, want %v", gotOffset, tt.wantOffset)
+			}
+			if gotLimit != tt.wantLimit {
+				t.Errorf("GetOffsetAndLimit() gotLimit = %v, want %v", gotLimit, tt.wantLimit)
+			}
+		})
+	}
+}
+
+func ptr(i int) *int {
+	return &i
+}