Add tests

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🧪 Vitest Coverage

> trends@7.0.0-rc2 test:coverage /home/runner/work/openc3-cosmos-trends/openc3-cosmos-trends
> vitest run --coverage


 RUN  v4.0.18 /home/runner/work/openc3-cosmos-trends/openc3-cosmos-trends
      Coverage enabled with v8

 ✓ src/lib/__tests__/tsUtils.test.js (13 tests) 6ms
 ✓ src/lib/__tests__/chartRenderer.test.js (15 tests) 13ms
 ✓ src/lib/__tests__/trendEngine.test.js (16 tests) 16ms
 ✓ src/lib/__tests__/csvParser.test.js (7 tests) 10ms
 ✓ src/lib/__tests__/movingAverage.test.js (6 tests) 6ms
 ✓ src/lib/__tests__/sma.test.js (6 tests) 7ms
 ✓ src/lib/__tests__/sinusoidalFit.test.js (4 tests) 12ms
 ✓ src/lib/__tests__/holtsLinear.test.js (4 tests) 5ms

 Test Files  8 passed (8)
      Tests  71 passed (71)
   Start at  20:30:57
   Duration  737ms (transform 220ms, setup 0ms, import 395ms, tests 75ms, environment 3ms)

 % Coverage report from v8
------------------|---------|----------|---------|---------|--------------------
File              | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s  
------------------|---------|----------|---------|---------|--------------------
All files         |   93.93 |    79.72 |   93.15 |   94.63 |                    
 chartRenderer.js |    90.9 |    74.13 |   88.88 |   90.24 | ...116,199,260-268 
 csvParser.js     |   90.56 |    77.27 |     100 |   90.69 | 15,65-66,74        
 holtsLinear.js   |     100 |    83.33 |     100 |     100 | 15-24              
 movingAverage.js |     100 |      100 |     100 |     100 |                    
 sinusoidalFit.js |   96.61 |    86.66 |    87.5 |   96.03 | 9,30,110,173       
 sma.js           |     100 |      100 |     100 |     100 |                    
 trendEngine.js   |   91.11 |    76.47 |   91.66 |      95 | 45,76-77,94        
 tsUtils.js       |   95.65 |    81.25 |     100 |     100 | 19,38-45           
------------------|---------|----------|---------|---------|--------------------