runner/AndroidJunitRunnerSample/app/src/main/java/com/example/android/testing/androidjunitrunnersample/Calculator.java [24:55]:
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public class Calculator {

    public enum Operator {ADD, SUB, DIV, MUL}

    /**
     * Addition operation
     */
    public double add(double firstOperand, double secondOperand) {
        return firstOperand + secondOperand;
    }

    /**
     * Substract operation
     */
    public double sub(double firstOperand, double secondOperand) {
        return firstOperand - secondOperand;
    }

    /**
     * Divide operation
     */
    public double div(double firstOperand, double secondOperand) {
        checkArgument(secondOperand != 0, "secondOperand must be != 0, you cannot divide by zero");
        return firstOperand / secondOperand;
    }

    /**
     * Multiply operation
     */
    public double mul(double firstOperand, double secondOperand) {

        return firstOperand * secondOperand;
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runner/AndroidTestOrchestratorSample/app/src/main/java/com/example/android/testing/androidtestorchestratorsample/Calculator.java [24:55]:
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public class Calculator {

    public enum Operator {ADD, SUB, DIV, MUL}

    /**
     * Addition operation
     */
    public double add(double firstOperand, double secondOperand) {
        return firstOperand + secondOperand;
    }

    /**
     * Substract operation
     */
    public double sub(double firstOperand, double secondOperand) {
        return firstOperand - secondOperand;
    }

    /**
     * Divide operation
     */
    public double div(double firstOperand, double secondOperand) {
        checkArgument(secondOperand != 0, "secondOperand must be != 0, you cannot divide by zero");
        return firstOperand / secondOperand;
    }

    /**
     * Multiply operation
     */
    public double mul(double firstOperand, double secondOperand) {

        return firstOperand * secondOperand;
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