Index: alien_formats/easyeda/arc_testbench/tester.c
===================================================================
--- alien_formats/easyeda/arc_testbench/tester.c	(revision 39205)
+++ alien_formats/easyeda/arc_testbench/tester.c	(revision 39206)
@@ -4,6 +4,32 @@
 
 #define DEG2RAD (M_PI/180)
 
+static double ang_normalize(double a)
+{
+	if ((a < 2*M_PI) || (a > 2*M_PI))
+		a = fmod(a, 2*M_PI);
+	if (a < 0)
+		a += 2*M_PI;
+	return a;
+}
+
+static int coord_neq(double a, double b)
+{
+	double diff = a - b;
+	return (diff > 0.001) || (diff < -0.001);
+}
+
+static int ang_neq(double a, double b)
+{
+	double diff = a - b;
+	if ((diff > 0.001) || (diff < -0.001)) {
+		a = ang_normalize(a);
+		b = ang_normalize(b);
+		diff = a - b;
+	}
+	return (diff > 0.001) || (diff < -0.001);
+}
+
 int main(int argc, char *argv[])
 {
 	double cx, cy, r, sad, dad;
@@ -25,7 +51,15 @@
 
 		res = arc_start_end_delta(sx, sy, ex, ey, dad, &ocx, &ocy, &or, &osrad, &oerad);
 
-		printf("res=%d center: %.3f;%.3f -> %.3f;%.3f rad: %.3f -> %.3f\n    angs: %.5f;%.5f ->  %.5f;%.5f\n", res, cx, cy, ocx, ocy, r, or, isa, iea, osrad, oerad);
+		printf("res=%d\n center: %.3f;%.3f -> %.3f;%.3f rad: %.3f -> %.3f\n angs: %.5f;%.5f ->  %.5f;%.5f\n", res, cx, cy, ocx, ocy, r, or, isa, iea, osrad, oerad);
+		if (res != 0)
+			printf(" -> BAD result\n");
+		else if (coord_neq(cx, ocx) || coord_neq(cy, ocy) || coord_neq(r, or))
+			printf(" -> BAD output coords\n");
+		else if (ang_neq(isa, osrad) || ang_neq(iea, oerad))
+			printf(" -> BAD angles\n");
+		else
+			printf(" -> OK\n");
 	}
 
 	return 0;