testinit ok
testaddpositive FAIL
testaddnegative FAIL
testremovepositive FAIL
testremovenegative FAIL
testclear ok

6 tests run
4 failures.

testaddpositive
- (expected/actual)
```
3
--------
```
- (expected/actual)
```
3
--------
```
- (expected/actual)
```
30
--------
```
testaddnegative
- (expected/actual)
```
1
--------
```
- (expected/actual)
```
10
--------
```
- (expected/actual)
```
1
--------
```
- (expected/actual)
```
10
--------
```
testremovepositive
- (expected/actual)
```
7
--------
```
- (expected/actual)
```
3
--------
```
testremovenegative
- (expected/actual)
```
10
--------
```
- (expected/actual)
```
1
--------
```