lit-test: fix tests incorrectly assuming an OutputCheck step.

lit-test/test/integration/class.py

@@ -6,7 +6,5 @@ class c:
     def f():
         return 2
 
-# CHECK-L: a 1
-print("a", c.a)
-# CHECK-L: f() 2
-print("f()", c.f())
+assert c.a == 1
+assert c.f() == 2

lit-test/test/integration/finally.py

@@ -1,5 +1,7 @@
-# RUN: %python -m artiq.compiler.testbench.jit %s
-# RUN: %python %s
+# RUN: %python -m artiq.compiler.testbench.jit %s >%t.1
+# RUN: OutputCheck %s --file-to-check=%t.1
+# RUN: %python %s >%t.2
+# RUN: OutputCheck %s --file-to-check=%t.2
 # REQUIRES: exceptions
 
 def f():

lit-test/test/integration/instance.py

@@ -6,11 +6,9 @@ class c:
 
 i = c()
 
-# CHECK-L: a 1
-print("a", i.a)
+assert i.a == 1
 
 def f():
     c = None
-    # CHECK-L: shadow a 1
-    print("shadow a", i.a)
+    assert i.a == 1
 f()