74. Mutation: Verify "Equation"

Mutation to verify the Equation code. The Equation engine is built on top of python language with the support of common Math operations.

The list of supported operations:

1. Python basic module: abs, all, any, bin, bool, bytearray, bytes, chr, complex, dict, dir, divmod, enumerate, filter, float, format, frozenset, hash, hex, id, int, isinstance, len, list, map, max, min, oct, ord, pow, range, repr, reversed, round, set, slice, sorted, str, sum, tuple, type, zip.

2. Python math module: acos, acosh, asin, asinh, atan, atan2, atanh, ceil, copysign, cos, cosh, degrees, e, exp, fabs, factorial, floor, fmod, frexp, fsum, hypot, isinf, isnan, ldexp, log, log10, log1p, modf, pi, pow, radians, sin, sinh, sqrt, tan, tanh, trunc.

3. Python conditions: if, elif, else.

4. Python loops: for, while.

equationAsText must be wrapped into """<equation>""" and the code must be python-based styled.

Keep only necessary tabulation and spacing.

mutation VerifyEquation {
  verifyEquation(input: {
    dataVariables: [{
      variable: "yield_vol"
      sampleValue: 1.1 
    }, {
      variable: "prod"
      sampleValue: 2.2
    }]
    equationAsText: """calculated = yield_vol/prod + 3.5 
if calculated >= 30:
    result = 35
elif calculated >= 20 and calculated < 30:
    result = 25
else:
    result = 15
    """
    equationResultVariable: "result"
  }) {
    executed
    result
    errorMessage
  }
}