test suite: rename tests containing 'fail' for easier search in logs

tests/assert/tdoassert.nim

@@ -0,0 +1,20 @@
+discard """
+  cmd: "nim $target -d:release $options $file"
+  output: '''
+test1:ok
+test2:ok
+'''
+"""
+
+import testhelper
+
+onFailedAssert(msg):
+  checkMsg(msg, "tdoassert.nim(15, 9) `a == 2` foo", "test1")
+
+var a = 1
+doAssert(a == 2, "foo")
+
+onFailedAssert(msg):
+  checkMsg(msg, "tdoassert.nim(20, 10) `a == 3` ", "test2")
+
+doAssert a == 3