Change tick0 test to check for consistent seek-ticks event

src/test/tick0.py

@@ -3,36 +3,47 @@
 
 send_gdb('handle SIGKILL stop')
 
-send_gdb('when')
-expect_gdb(re.compile(r'Current event: (\d+)'))
-event = eval(last_match().group(1));
+def get_when():
+    send_gdb('when')
+    expect_gdb(re.compile(r'Current event: (\d+)'))
+    event = eval(last_match().group(1))
 
-send_gdb('when-ticks')
-expect_gdb(re.compile(r'Current tick: (\d+)'))
-ticks = eval(last_match().group(1));
-if ticks != 0:
-    failed('ERROR in first "when-ticks"')
+    send_gdb('when-ticks')
+    expect_gdb(re.compile(r'Current tick: (\d+)'))
+    ticks = eval(last_match().group(1))
+    return (event, ticks)
+
+(event_start, ticks_start) = get_when()
+if ticks_start != 0:
+    failed('ERROR: Wrong initial ticks')
 
 send_gdb('c')
 
-send_gdb('when-ticks')
-expect_gdb(re.compile(r'Current tick: (\d+)'))
-ticks2 = eval(last_match().group(1));
-if ticks2 < 99999:
-    failed('ERROR in second "when-ticks"')
+(event_end, ticks_end) = get_when()
+if ticks_end < 99999:
+    failed('End ticks too low')
 
-send_gdb("seek-ticks %d" % ticks)
+send_gdb("seek-ticks %d" % ticks_start)
 expect_gdb("Program stopped.")
-send_gdb('when-ticks')
-expect_gdb(re.compile(r'Current tick: (\d+)'))
-ticks3 = eval(last_match().group(1));
-if ticks3 != ticks:
-    failed('ERROR: Failed to seek back to ticks')
-
-send_gdb('when')
-expect_gdb(re.compile(r'Current event: (\d+)'))
-event2 = eval(last_match().group(1));
-if event2 != event:
-    failed('ERROR: Failed to seek back to ticks')
+(event_exp, ticks_from_end) = get_when()
+if ticks_from_end != ticks_start:
+    failed('ERROR: Failed to seek back to tick 0 from end')
+
+# test some starting events (at least all at tick 0)
+for event in range(event_start-1, min(event_start+5, event_end-1)):
+    send_gdb('run %d' % event)
+    expect_gdb('from the beginning')
+    send_gdb('y')
+    expect_gdb(re.compile(r'(Thread \d+|Program) stopped'))
+
+
+    send_gdb("seek-ticks %d" % ticks_start)
+    expect_gdb("Program stopped.")
+
+    (event, ticks) = get_when()
+    if ticks != 0:
+        failed('ERROR: Failed to seek back to tick 0 from run')
+    if event != event_exp:
+        failed('ERROR: Inconsistent result events from seek-ticks 0')
 
 ok()