Test Cases:

AdvancedAstrologyTest verifyNoFields 	Ok

AdvancedAstrologyTest testPrintStars 	Fail

You didn't print any spaces when printStars was called.

AdvancedAstrologyTest testPrintSpaces1 	Ok

AdvancedAstrologyTest testPrintSpaces2 	Ok

AdvancedAstrologyTest testPrintSmallTriangle 	Ok

AdvancedAstrologyTest testPrintTriangle 	Ok

AdvancedAstrologyTest testChristmasTree0 	Ok

AdvancedAstrologyTest testChristmasTree1 	Ok

AdvancedAstrologyTest testChristmasTree2 	Ok


Source Code:

public class AdvancedAstrology {

	    public static void printStars(int number) {
	        // part 1 of the exercise
	        int stars = 1;
	        while (stars <= number) {
	            System.out.print("*");
	            stars++;
	        }
	    }

	    public static void printSpaces(int number) {
	        // part 1 of the exercise
	        int spaces = 1;
	        while (spaces <= number) {
	            System.out.print(" ");
	            spaces++;
	        }
	    }

	    public static void printTriangle(int size) {
	        // part 2 of the exercise
	        for (int height = 1; height <= size; height++) {
	            printSpaces(size - height);
	            printStars(height);
	            System.out.println("");
	        }

	    }

	    public static void christmasTree(int height) {
	        // part 3 of the exercise
	        for (int size = 1; size <= height; size++) {
	            printSpaces(height - size);
	            if (size > 1) {
	                printStars(size * 2 - 1);
	            } else {
	                printStars(size);
	            }
	            System.out.println("");
	        }

	        for (int trunk = 0; trunk < 2; trunk++) {
	            printSpaces (height - 2);
	            System.out.println("***");
	        }
	    }

	    public static void main(String[] args) {
	        // The tests are not checking the main, so you can modify it freely.

	        printTriangle(5);
	        System.out.println("---");
	        christmasTree(4);
	        System.out.println("---");
	        christmasTree(10);
	    }
	}