initial commit

tests/equation.js

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+import {expect} from 'chai';
+import M from '../index.js';
+
+describe('Equations', () => {
+  it('should work with one variable', () => {
+    let equation = M.equation('x+2');
+
+    expect(equation(2)).to.equal(4);
+  });
+
+  it('should work with multiple variables', () => {
+    let equation = M.equation('x+y');
+    expect(equation(2, 4)).to.equal(6);
+  });
+
+  it('should work with multiple instances of the same variable', () => {
+    let equation = M.equation('x*x');
+    expect(equation(4)).to.equal(16);
+  });
+
+  it('should only accept lowercase letters', () => {
+    let equation = M.equation('X+2');
+    expect(equation).to.throw();
+  });
+
+  it('Test case', () => {
+    let equation = M.equation('2+x*(y+4)+z^2');
+    expect(equation(2, 4, 3)).to.equal(27);
+  });
+});

tests/solve.js

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+import {expect} from 'chai';
+import M from '../index.js';
+
+describe('Basic math operators', () => {
+  it('should work for add +', () => {
+    expect(M.solve('2+2')).to.equal(4);
+  });
+
+  it('should work for minus -', () => {
+    expect(M.solve('15-3')).to.equal(12);
+  });
+
+  it('should work for divison /', () => {
+    expect(M.solve('20/2')).to.equal(10);
+  });
+
+  it('should work for multiplication *', () => {
+    expect(M.solve('6*3')).to.equal(18);
+  });
+
+  it('should work for power ^', () => {
+    expect(M.solve('5^2')).to.equal(25);
+  });
+
+  it('should work for multi-digit numbers', () => {
+    expect(M.solve('12+15')).to.equal(27);
+  });
+});
+
+describe('Precedence', () => {
+  it('Test case 1', () => {
+    expect(M.solve('2+(2+1)*(1+1)^2')).to.equal(14);
+  });
+
+  it('Test case 2', () => {
+    expect(M.solve('2+5*4/2-2')).to.equal(10);
+  });
+
+  it('Test case 3', () => {
+    expect(M.solve('2+(5*4/2)-2')).to.equal(10);
+  });
+
+  it('Test case 4', () => {
+    expect(M.solve('(2+2)^2+(5+1)*4+(2+(4/2)/2)')).to.equal(16 + 24 + 3);
+  });
+});
+
+describe('Functions', () => {
+  it('should work for with parantheses', () => {
+    expect(M.solve('lg(4) * 5')).to.equal(10);
+  });
+
+  it('should work for without parantheses', () => {
+    expect(M.solve('lg4 * 5')).to.equal(10);
+  });
+});
+
+describe('Constats', () => {
+  it('should work for constant values', () => {
+    expect(M.solve('sin(PI/2)')).to.equal(1);
+  });
+
+  it('should work for functions as constants', () => {
+    expect(M.solve('RAND')).to.not.equal(M.solve('RAND'));
+  });
+});