fhdl.cd: add tests.

nmigen/fhdl/cd.py

@@ -32,8 +32,9 @@ class ClockDomain:
     """
     def __init__(self, name=None, reset_less=False, async_reset=False):
         if name is None:
+            try:
                 name = tracer.get_var_name()
-        if name is None:
+            except tracer.NameNotFound:
                 raise ValueError("Clock domain name must be specified explicitly")
         if name.startswith("cd_"):
             name = name[3:]

nmigen/test/test_fhdl_cd.py

@@ -0,0 +1,33 @@
+from ..fhdl.cd import *
+from .tools import *
+
+
+class ClockDomainCase(FHDLTestCase):
+    def test_name(self):
+        pix = ClockDomain()
+        self.assertEqual(pix.name, "pix")
+        cd_pix = ClockDomain()
+        self.assertEqual(pix.name, "pix")
+        dom = [ClockDomain("foo")][0]
+        self.assertEqual(dom.name, "foo")
+        with self.assertRaises(ValueError,
+                msg="Clock domain name must be specified explicitly"):
+            ClockDomain()
+
+    def test_with_reset(self):
+        pix = ClockDomain()
+        self.assertIsNotNone(pix.clk)
+        self.assertIsNotNone(pix.rst)
+        self.assertFalse(pix.async_reset)
+
+    def test_without_reset(self):
+        pix = ClockDomain(reset_less=True)
+        self.assertIsNotNone(pix.clk)
+        self.assertIsNone(pix.rst)
+        self.assertFalse(pix.async_reset)
+
+    def test_async_reset(self):
+        pix = ClockDomain(async_reset=True)
+        self.assertIsNotNone(pix.clk)
+        self.assertIsNotNone(pix.rst)
+        self.assertTrue(pix.async_reset)

nmigen/test/test_fhdl_dsl.py

@@ -1,4 +1,3 @@
-import unittest
 from contextlib import contextmanager
 
 from ..fhdl.ast import *
@@ -16,14 +15,6 @@ class DSLTestCase(FHDLTestCase):
         self.c3 = Signal()
         self.w1 = Signal(4)
 
-    @contextmanager
-    def assertRaises(self, exception, msg=None):
-        with super().assertRaises(exception) as cm:
-            yield
-        if msg is not None:
-            # WTF? unittest.assertRaises is completely broken.
-            self.assertEqual(str(cm.exception), msg)
-
     def test_d_comb(self):
         m = Module()
         m.d.comb += self.c1.eq(1)

nmigen/test/test_fhdl_ir.py

@@ -1,10 +1,9 @@
-import unittest
-
-from nmigen.fhdl.ast import *
-from nmigen.fhdl.ir import *
+from ..fhdl.ast import *
+from ..fhdl.ir import *
+from .tools import *
 
 
-class FragmentPortsTestCase(unittest.TestCase):
+class FragmentPortsTestCase(FHDLTestCase):
     def setUp(self):
         self.s1 = Signal()
         self.s2 = Signal()

nmigen/test/test_fhdl_value.py

@@ -1,9 +1,8 @@
-import unittest
-
-from nmigen.fhdl.ast import *
+from ..fhdl.ast import *
+from .tools import *
 
 
-class ValueTestCase(unittest.TestCase):
+class ValueTestCase(FHDLTestCase):
     def test_wrap(self):
         self.assertIsInstance(Value.wrap(0), Const)
         self.assertIsInstance(Value.wrap(True), Const)
@@ -58,7 +57,7 @@ class ValueTestCase(unittest.TestCase):
             Const(31)["str"]
 
 
-class ConstTestCase(unittest.TestCase):
+class ConstTestCase(FHDLTestCase):
     def test_shape(self):
         self.assertEqual(Const(0).shape(),   (0, False))
         self.assertEqual(Const(1).shape(),   (1, False))
@@ -83,7 +82,7 @@ class ConstTestCase(unittest.TestCase):
             hash(Const(0))
 
 
-class OperatorTestCase(unittest.TestCase):
+class OperatorTestCase(FHDLTestCase):
     def test_invert(self):
         v = ~Const(0, 4)
         self.assertEqual(repr(v), "(~ (const 4'd0))")
@@ -225,7 +224,7 @@ class OperatorTestCase(unittest.TestCase):
             hash(Const(0) + Const(0))
 
 
-class SliceTestCase(unittest.TestCase):
+class SliceTestCase(FHDLTestCase):
     def test_shape(self):
         s1 = Const(10)[2]
         self.assertEqual(s1.shape(), (1, False))
@@ -237,7 +236,7 @@ class SliceTestCase(unittest.TestCase):
         self.assertEqual(repr(s1), "(slice (const 4'd10) 2:3)")
 
 
-class CatTestCase(unittest.TestCase):
+class CatTestCase(FHDLTestCase):
     def test_shape(self):
         c1 = Cat(Const(10))
         self.assertEqual(c1.shape(), (4, False))
@@ -251,7 +250,7 @@ class CatTestCase(unittest.TestCase):
         self.assertEqual(repr(c1), "(cat (const 4'd10) (const 1'd1))")
 
 
-class ReplTestCase(unittest.TestCase):
+class ReplTestCase(FHDLTestCase):
     def test_shape(self):
         r1 = Repl(Const(10), 3)
         self.assertEqual(r1.shape(), (12, False))
@@ -267,7 +266,7 @@ class ReplTestCase(unittest.TestCase):
         self.assertEqual(repr(r1), "(repl (const 4'd10) 3)")
 
 
-class SignalTestCase(unittest.TestCase):
+class SignalTestCase(FHDLTestCase):
     def test_shape(self):
         s1 = Signal()
         self.assertEqual(s1.shape(), (1, False))
@@ -328,7 +327,7 @@ class SignalTestCase(unittest.TestCase):
         self.assertEqual(s5.shape(), (4, False))
 
 
-class ClockSignalTestCase(unittest.TestCase):
+class ClockSignalTestCase(FHDLTestCase):
     def test_domain(self):
         s1 = ClockSignal()
         self.assertEqual(s1.domain, "sync")
@@ -343,7 +342,7 @@ class ClockSignalTestCase(unittest.TestCase):
         self.assertEqual(repr(s1), "(clk sync)")
 
 
-class ResetSignalTestCase(unittest.TestCase):
+class ResetSignalTestCase(FHDLTestCase):
     def test_domain(self):
         s1 = ResetSignal()
         self.assertEqual(s1.domain, "sync")

nmigen/test/test_fhdl_xfrm.py

@@ -1,6 +1,3 @@
-import re
-import unittest
-
 from ..fhdl.ast import *
 from ..fhdl.ir import *
 from ..fhdl.xfrm import *