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TestString.java
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TestString.java
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// This program tests the GuitarString class. The program reads from the file
// string.txt which has a series of test cases with the correct answers.
import java.util.*;
import java.io.*;
public class TestString {
private static final double EPSILON = 1E-12;
public static void main(String[] args) {
Scanner input = null;
try {
input = new Scanner(new File("string.txt"));
} catch (FileNotFoundException e) {
System.out.println("You must copy string.txt to this directory" +
" before running the testing program.");
System.exit(1);
}
input.useLocale(Locale.US);
testWithArray(input);
testWithFrequency(input);
System.out.println("passed all tests");
}
// pre : input file has a series of test cases for specific arrays of
// values showing what the sample value should be as we make repeated
// calls on tic
// post: program is halted if an error is encountered
public static void testWithArray(Scanner input) {
int cases = input.nextInt();
for (int i = 0; i < cases; i++) {
int size = input.nextInt();
double[] data = new double[size];
for (int j = 0; j < data.length; j++) {
data[j] = input.nextDouble();
}
System.out.println("Testing GuitarString with this array:");
System.out.println(Arrays.toString(data));
GuitarString g = new GuitarString(data);
for (int time = 0; time < 10 * data.length; time++) {
double sample = input.nextDouble();
double sample2 = g.sample();
if (Math.abs(sample - sample2) > EPSILON) {
System.out.println("ERROR: Sample mismatch");
System.out.println(" when time = " + time);
System.out.println(" sample should = " + sample);
System.out.println(" string reports sample = " + sample2);
System.exit(1);
}
g.tic();
}
System.out.println("passed");
System.out.println();
}
}
// pre : input file has a series of test cases listing a frequency and ring
// buffer size to test
// post: program is halted if an error is encountered
public static void testWithFrequency(Scanner input) {
int cases = input.nextInt();
for (int i = 0; i < cases; i++) {
int freq = input.nextInt();
int size = input.nextInt();
System.out.println("Testing GuitarString with frequency " + freq);
GuitarString g = new GuitarString(freq);
g.pluck();
double sum1 = 0.0;
double first = g.sample();
Set<Double> values = new HashSet<Double>();
for (int j = 0; j < size - 1; j++) {
double n = g.sample();
sum1 = sum1 + n;
values.add(n);
if (n < -0.5 || n > 0.5) {
System.out.println("ERROR: sample #" + j + " = " + n);
System.exit(1);
}
g.tic();
}
if (values.size() < 0.95 * (size - 1)) {
System.out.println("ERROR: samples returned are not random");
System.out.println("string sampled " + (size - 1) + " times");
System.out.println("set of samples returned = " + values);
System.exit(1);
}
double last = g.sample();
sum1 = sum1 + last;
g.tic();
double sum2 = 0.0;
for (int j = 0; j < size - 1; j++) {
sum2 = sum2 + g.sample();
g.tic();
}
double correctSum = (sum1 - first / 2.0 - last / 2.0) * 0.996;
if (Math.abs(sum2 - correctSum) > EPSILON) {
System.out.println("ERROR: sum of samples is not correct");
System.out.println("ring buffer size should = " + size);
System.exit(1);
} else {
System.out.println("passed");
}
System.out.println();
}
}
}