Consider the following class:

public class NumericValue { private double d; private static final String theValueKindName = new String("Numeric"); public NumericValue() { d =0.0; } public NumericValue (double x) { d = x; } // Indicates what kind of value this is. For any two values, v1 and v2, // v1.valueKind() == v2.valueKind() if and only if they are of the // same kind (e.g., two numeric values). The actual character string // pointed to by valueKind() may be anything, but should be set to // something descriptive as an aid in identification and debugging. public String valueKind() { return theValueKindName; } // Produce a string denoting this value such that the // string's length() <= maxWidth (assuming maxWidth > 0) // If maxWidth==0, then the output string may be arbitrarily long. // This function is intended to supply the text for display in the // cells of a spreadsheet. public String render (int maxWidth) { String rendering = "" + d; if (rendering.indexOf('.') >= 0 && rendering.indexOf('E') < 0 && rendering.indexOf('e') < 0) { while (rendering.charAt(rendering.length()-1) == '0') { rendering = rendering.substring(0, rendering.length()-1); } if (rendering.charAt(rendering.length()-1) == '.') { rendering = rendering.substring(0, rendering.length()-1); } } if (maxWidth > 0 && rendering.length() > maxWidth) { String discarded = rendering.substring(maxWidth); rendering = rendering.substring(0, maxWidth); if (discarded.indexOf('.') >= 0) { // We have a problem - can't fit the decimal point into // the allowed width rendering = "****************************"; rendering = rendering.substring(0, maxWidth); } } return rendering; } public Object clone() { return new NumericValue(d); } public double getNumericValue() { return d; } boolean isEqual (Value v) //pre: valueKind() == v.valueKind() // Returns true iff this value is equal to v, using a comparison // appropriate to the kind of value. { NumericValue nv = (NumericValue)v; return d == nv.d; } }

If you were doing a *unit test for this ADT, what is the minimum number of test assertions you should expect to provide?