"""Tests for Coverage.py's arc measurement.""" import sys from test.coveragetest import CoverageTest class SimpleArcTest(CoverageTest): """Tests for Coverage.py's arc measurement.""" def test_simple_sequence(self): self.check_coverage("""\ a = 1 b = 2 """, arcz=".1 12 2.") self.check_coverage("""\ a = 1 b = 3 """, arcz=".1 13 3.") self.check_coverage("""\ a = 2 b = 3 c = 5 """, arcz=".2 23 35 5-2") def test_function_def(self): self.check_coverage("""\ def foo(): a = 2 foo() """, arcz=".1 .2 14 2. 4.") def test_if(self): self.check_coverage("""\ a = 1 if len([]) == 0: a = 3 assert a == 3 """, arcz=".1 12 23 24 34 4.", arcz_missing="24") self.check_coverage("""\ a = 1 if len([]) == 1: a = 3 assert a == 1 """, arcz=".1 12 23 24 34 4.", arcz_missing="23 34") def test_if_else(self): self.check_coverage("""\ if len([]) == 0: a = 2 else: a = 4 assert a == 2 """, arcz=".1 12 25 14 45 5.", arcz_missing="14 45") self.check_coverage("""\ if len([]) == 1: a = 2 else: a = 4 assert a == 4 """, arcz=".1 12 25 14 45 5.", arcz_missing="12 25") def test_compact_if(self): self.check_coverage("""\ a = 1 if len([]) == 0: a = 2 assert a == 2 """, arcz=".1 12 23 3.", arcz_missing="") self.check_coverage("""\ def fn(x): if x % 2: return True return False a = fn(1) assert a == True """, arcz=".1 14 45 5. .2 2. 23 3.", arcz_missing="23 3.") def test_multiline(self): # The firstlineno of the a assignment below differs among Python # versions. if sys.version_info >= (2, 5): arcz = ".1 15 5-2" else: arcz = ".1 15 5-1" self.check_coverage("""\ a = ( 2 + 3 ) b = \\ 6 """, arcz=arcz, arcz_missing="") def test_if_return(self): self.check_coverage("""\ def if_ret(a): if a: return 3 b = 4 return 5 x = if_ret(0) + if_ret(1) assert x == 8 """, arcz=".1 16 67 7. .2 23 24 3. 45 5.", arcz_missing="" ) def test_dont_confuse_exit_and_else(self): self.check_coverage("""\ def foo(): if foo: a = 3 else: a = 5 return a assert foo() == 3 # 7 """, arcz=".1 17 7. .2 23 36 25 56 6.", arcz_missing="25 56" ) self.check_coverage("""\ def foo(): if foo: a = 3 else: a = 5 foo() # 6 """, arcz=".1 16 6. .2 23 3. 25 5.", arcz_missing="25 5." ) if 0: # expected failure def test_lambdas_are_confusing_bug_90(self): self.check_coverage("""\ fn = lambda x: x a = 1 """, arcz=".1 12 2." ) if sys.version_info >= (2, 6): class WithTest(CoverageTest): """Arc-measuring tests involving context managers.""" def test_with(self): self.check_coverage("""\ def example(): with open("test", "w") as f: # exit f.write("") return 1 example() """, arcz=".1 .2 23 34 4. 16 6." ) class LoopArcTest(CoverageTest): """Arc-measuring tests involving loops.""" def test_loop(self): self.check_coverage("""\ for i in range(10): a = i assert a == 9 """, arcz=".1 12 21 13 3.", arcz_missing="") self.check_coverage("""\ a = -1 for i in range(0): a = i assert a == -1 """, arcz=".1 12 23 32 24 4.", arcz_missing="23 32") def test_nested_loop(self): self.check_coverage("""\ for i in range(3): for j in range(3): a = i + j assert a == 4 """, arcz=".1 12 23 32 21 14 4.", arcz_missing="") def test_break(self): self.check_coverage("""\ for i in range(10): a = i break # 3 a = 99 assert a == 0 # 5 """, arcz=".1 12 23 35 15 41 5.", arcz_missing="15 41") def test_continue(self): self.check_coverage("""\ for i in range(10): a = i continue # 3 a = 99 assert a == 9 # 5 """, arcz=".1 12 23 31 15 41 5.", arcz_missing="41") def test_nested_breaks(self): self.check_coverage("""\ for i in range(3): for j in range(3): a = i + j break # 4 if i == 2: break assert a == 2 and i == 2 # 7 """, arcz=".1 12 23 34 45 25 56 51 67 17 7.", arcz_missing="17 25") def test_while_true(self): # With "while 1", the loop knows it's constant. self.check_coverage("""\ a, i = 1, 0 while 1: if i >= 3: a = 4 break i += 1 assert a == 4 and i == 3 """, arcz=".1 12 23 34 45 36 63 57 7.", ) # With "while True", 2.x thinks it's computation, 3.x thinks it's # constant. if sys.version_info >= (3, 0): arcz = ".1 12 23 34 45 36 63 57 7." else: arcz = ".1 12 23 27 34 45 36 62 57 7." self.check_coverage("""\ a, i = 1, 0 while True: if i >= 3: a = 4 break i += 1 assert a == 4 and i == 3 """, arcz=arcz, ) def test_for_if_else_for(self): self.check_coverage("""\ def branches_2(l): if l: for e in l: a = 4 else: a = 6 def branches_3(l): for x in l: if x: for e in l: a = 12 else: a = 14 branches_2([0,1]) branches_3([0,1]) """, arcz= ".1 18 8G GH H. " ".2 23 34 43 26 3. 6. " ".9 9A 9-8 AB BC CB B9 AE E9", arcz_missing="26 6." ) def test_for_else(self): self.check_coverage("""\ def forelse(seq): for n in seq: if n > 5: break else: print('None of the values were greater than 5') print('Done') forelse([1,2]) forelse([1,6]) """, arcz=".1 .2 23 32 34 47 26 67 7. 18 89 9." ) if 0: # expected failure def test_confusing_for_loop_bug_175(self): self.check_coverage("""\ o = [(1,2), (3,4)] o = [a for a in o] for tup in o: x = tup[0] y = tup[1] """, arcz=".1 12 23 34 45 53 3.", arcz_missing="", arcz_unpredicted="") self.check_coverage("""\ o = [(1,2), (3,4)] for tup in [a for a in o]: x = tup[0] y = tup[1] """, arcz=".1 12 23 34 42 2.", arcz_missing="", arcz_unpredicted="") class ExceptionArcTest(CoverageTest): """Arc-measuring tests involving exception handling.""" def test_try_except(self): self.check_coverage("""\ a, b = 1, 1 try: a = 3 except: b = 5 assert a == 3 and b == 1 """, arcz=".1 12 23 36 45 56 6.", arcz_missing="45 56") self.check_coverage("""\ a, b = 1, 1 try: a = 3 raise Exception("Yikes!") a = 5 except: b = 7 assert a == 3 and b == 7 """, arcz=".1 12 23 34 58 67 78 8.", arcz_missing="58", arcz_unpredicted="46") def test_hidden_raise(self): self.check_coverage("""\ a, b = 1, 1 def oops(x): if x % 2: raise Exception("odd") try: a = 5 oops(1) a = 7 except: b = 9 assert a == 5 and b == 9 """, arcz=".1 12 .3 3-2 24 45 56 67 7A 89 9A A.", arcz_missing="67 7A", arcz_unpredicted="68") def test_except_with_type(self): self.check_coverage("""\ a, b = 1, 1 def oops(x): if x % 2: raise ValueError("odd") def try_it(x): try: a = 6 oops(x) a = 8 except ValueError: b = 10 return a assert try_it(0) == 8 # C assert try_it(1) == 6 # D """, arcz=".1 12 .3 3-2 24 4C CD D. .5 56 67 78 8B 9A AB B-4", arcz_missing="", arcz_unpredicted="79") def test_try_finally(self): self.check_coverage("""\ a, c = 1, 1 try: a = 3 finally: c = 5 assert a == 3 and c == 5 """, arcz=".1 12 23 35 56 6.", arcz_missing="") self.check_coverage("""\ a, c, d = 1, 1, 1 try: try: a = 4 finally: c = 6 except: d = 8 assert a == 4 and c == 6 and d == 1 # 9 """, arcz=".1 12 23 34 46 67 78 89 69 9.", arcz_missing="67 78 89", arcz_unpredicted="") self.check_coverage("""\ a, c, d = 1, 1, 1 try: try: a = 4 raise Exception("Yikes!") a = 6 finally: c = 8 except: d = 10 # A assert a == 4 and c == 8 and d == 10 # B """, arcz=".1 12 23 34 45 68 89 8B 9A AB B.", arcz_missing="68 8B", arcz_unpredicted="58") def test_finally_in_loop(self): self.check_coverage("""\ a, c, d, i = 1, 1, 1, 99 try: for i in range(5): try: a = 5 if i > 0: raise Exception("Yikes!") a = 8 finally: c = 10 except: d = 12 # C assert a == 5 and c == 10 and d == 12 # D """, arcz=".1 12 23 34 3D 45 56 67 68 8A A3 AB AD BC CD D.", arcz_missing="3D AD", arcz_unpredicted="7A") self.check_coverage("""\ a, c, d, i = 1, 1, 1, 99 try: for i in range(5): try: a = 5 if i > 10: raise Exception("Yikes!") a = 8 finally: c = 10 except: d = 12 # C assert a == 8 and c == 10 and d == 1 # D """, arcz=".1 12 23 34 3D 45 56 67 68 8A A3 AB AD BC CD D.", arcz_missing="67 AB AD BC CD", arcz_unpredicted="") def test_break_in_finally(self): self.check_coverage("""\ a, c, d, i = 1, 1, 1, 99 try: for i in range(5): try: a = 5 if i > 0: break a = 8 finally: c = 10 except: d = 12 # C assert a == 5 and c == 10 and d == 1 # D """, arcz=".1 12 23 34 3D 45 56 67 68 7A 8A A3 AB AD BC CD D.", arcz_missing="3D AB BC CD", arcz_unpredicted="") if 0: # expected failure def test_finally_in_loop_2(self): self.check_coverage("""\ for i in range(5): try: j = 3 finally: f = 5 g = 6 h = 7 """, arcz=".1 12 23 35 56 61 17 7.", arcz_missing="", arcz_unpredicted="") if sys.version_info >= (2, 5): # Try-except-finally was new in 2.5 def test_except_finally(self): self.check_coverage("""\ a, b, c = 1, 1, 1 try: a = 3 except: b = 5 finally: c = 7 assert a == 3 and b == 1 and c == 7 """, arcz=".1 12 23 45 37 57 78 8.", arcz_missing="45 57") self.check_coverage("""\ a, b, c = 1, 1, 1 def oops(x): if x % 2: raise Exception("odd") try: a = 5 oops(1) a = 7 except: b = 9 finally: c = 11 assert a == 5 and b == 9 and c == 11 """, arcz=".1 12 .3 3-2 24 45 56 67 7B 89 9B BC C.", arcz_missing="67 7B", arcz_unpredicted="68") class MiscArcTest(CoverageTest): """Miscellaneous arc-measuring tests.""" def test_dict_literal(self): self.check_coverage("""\ d = { 'a': 2, 'b': 3, 'c': { 'd': 5, 'e': 6, } } assert d """, arcz=".1 19 9.") class ExcludeTest(CoverageTest): """Tests of exclusions to indicate known partial branches.""" def test_default(self): # A number of forms of pragma comment are accepted. self.check_coverage("""\ a = 1 if a: #pragma: no branch b = 3 c = 4 if c: # pragma NOBRANCH d = 6 e = 7 """, [1,2,3,4,5,6,7], arcz=".1 12 23 24 34 45 56 57 67 7.", arcz_missing="") def test_custom_pragmas(self): self.check_coverage("""\ a = 1 while a: # [only some] c = 3 break assert c == 5-2 """, [1,2,3,4,5], partials=["only some"], arcz=".1 12 23 34 45 25 5.", arcz_missing="")