[test][toolchain_processing_order] Code cleanup

beat/core/test/test_toolchain_processing_order.py

@@ -43,7 +43,7 @@ from . import prefix
 def test_integers_addition_1():
 
     toolchain = Toolchain(prefix, "user/integers_addition/1")
-    assert toolchain.valid
+    nose.tools.assert_true(toolchain.valid)
 
     order = toolchain.execution_order()
     nose.tools.eq_(list(order.keys()), ["addition", "analysis"])
@@ -54,7 +54,7 @@ def test_integers_addition_1():
 def test_integers_addition_2():
 
     toolchain = Toolchain(prefix, "user/integers_addition/2")
-    assert toolchain.valid
+    nose.tools.assert_true(toolchain.valid)
 
     order = toolchain.execution_order()
     nose.tools.eq_(list(order.keys()), ["addition1", "addition2", "analysis"])
@@ -66,7 +66,7 @@ def test_integers_addition_2():
 def test_integers_addition_3():
 
     toolchain = Toolchain(prefix, "user/integers_addition/3")
-    assert toolchain.valid
+    nose.tools.assert_true(toolchain.valid)
 
     order = toolchain.execution_order()
     nose.tools.eq_(