diff --git a/tests/gentest.c b/tests/gentest.c
new file mode 100644
index 0000000..d4532c8
--- /dev/null
+++ b/tests/gentest.c
@@ -0,0 +1,54 @@
+# include <time.h>
+# include <stdio.h>
+# include <stdlib.h>
+
+# define WORLD_WIDTH 256 // World width.
+# define WORLD_HEIGHT 128 // World height.
+
+void generateworld(unsigned short terrain[], int w, int h, int genstart, int genmin, int genmax, int someof, int type) {
+	int x = 0, y = genstart, n, i, a, t;
+	for(x=0;x!=w;x++){
+		srand(clock());
+		a = (int)rand() % 2;
+		if(a==0){
+			for(i=y;i!=h;i++){
+				srand(clock());
+				t = (int)rand() % 2;
+				if(t==0){
+					terrain[i*w+x] = type;
+				}else if(t==1){
+					terrain[i*w+x] = someof;
+				}
+			}
+		}else if(a==1){
+			for(i=y;i!=h;i++){
+				terrain[i*w+x] = type;
+			}
+		}
+		srand(clock());
+		n = (int)rand() % 2;
+		if(n==0 && y<genmax){
+			y++;
+		}else if(n==1 && y>genmin){
+			y--;
+		}
+	}
+}
+int main() {
+	unsigned short terrain[WORLD_WIDTH*WORLD_HEIGHT];
+	int i, x, y;
+	for(i=0;i!=WORLD_WIDTH*WORLD_HEIGHT;i++){
+		terrain[i] = 0;
+	}
+	srand(clock());
+	generateworld(terrain, WORLD_WIDTH, WORLD_HEIGHT, (int)rand() % 2, WORLD_HEIGHT - 20, WORLD_HEIGHT - 2, 0, 1);
+	srand(clock());
+	generateworld(terrain, WORLD_WIDTH, WORLD_HEIGHT, (int)rand() % 2, WORLD_HEIGHT - 35, WORLD_HEIGHT - 16, 3, 2);
+	for(y=0;y!=WORLD_HEIGHT;y++){
+		for(x=0;x!=WORLD_WIDTH;x++){
+			printf("%d", terrain[y*WORLD_WIDTH+x]);
+		}
+		printf("\n");
+	}
+	return 0;
+}
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