Update fine-grained tests to prep for --namespace-packages support

These tests were deleting package files, but not the empty
directory, causing those directories to be interpreted as
namespace packages in #9636

Author: nipunn1313

test-data/unit/fine-grained-follow-imports.test

@@ -418,8 +418,7 @@ def f(x: str) -> None: pass
 [file p/m.py.3]
 def f(x: str) -> None: pass
 
-[delete p/m.py.4]
-[delete p/__init__.py.4]
+[delete p.4]
 
 [out]
 ==
@@ -445,8 +444,7 @@ def f(x: str) -> None: pass
 
 1()
 
-[delete p/m.py.3]
-[delete p/__init__.py.3]
+[delete p.3]
 
 [out]
 ==

test-data/unit/fine-grained-modules.test

@@ -854,8 +854,7 @@ p.f(1)
 from p.a import f
 [file p/a.py]
 def f(x: str) -> None: pass
-[delete p/__init__.py.2]
-[delete p/a.py.2]
+[delete p.2]
 [out]
 main:2: error: Argument 1 to "f" has incompatible type "int"; expected "str"
 ==
@@ -870,7 +869,7 @@ p.a.f(1)
 [file p/a.py]
 def f(x: str) -> None: pass
 [delete p/a.py.2]
-[delete p/__init__.py.3]
+[delete p.3]
 [builtins fixtures/module.pyi]
 [out]
 main:3: error: Argument 1 to "f" has incompatible type "int"; expected "str"
@@ -884,25 +883,26 @@ main:2: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missin
 main:2: error: Cannot find implementation or library stub for module named "p"
 
 [case testDeletePackage4]
+# flags: --namespace-packages
 import p.a
 p.a.f(1)
 [file p/a.py]
 def f(x: str) -> None: pass
 [file p/__init__.py]
 [delete p/__init__.py.2]
-[delete p/a.py.3]
+[delete p.3]
 [out]
-main:2: error: Argument 1 to "f" has incompatible type "int"; expected "str"
+main:3: error: Argument 1 to "f" has incompatible type "int"; expected "str"
 ==
-main:1: error: Cannot find implementation or library stub for module named "p.a"
-main:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
-main:1: error: Cannot find implementation or library stub for module named "p"
+main:2: error: Import of "p.a" ignored
+main:2: note: (Using --follow-imports=error, module not passed on command line)
 ==
-main:1: error: Cannot find implementation or library stub for module named "p.a"
-main:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
-main:1: error: Cannot find implementation or library stub for module named "p"
+main:2: error: Cannot find implementation or library stub for module named "p.a"
+main:2: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
+main:2: error: Cannot find implementation or library stub for module named "p"
 
 [case testDeletePackage5]
+# flags: --namespace-packages
 # cmd1: mypy main p/a.py p/__init__.py
 # cmd2: mypy main p/a.py
 # cmd3: mypy main
@@ -913,20 +913,20 @@ p.a.f(1)
 def f(x: str) -> None: pass
 [file p/__init__.py]
 [delete p/__init__.py.2]
-[delete p/a.py.3]
+[delete p.3]
 [out]
-main:6: error: Argument 1 to "f" has incompatible type "int"; expected "str"
+main:7: error: Argument 1 to "f" has incompatible type "int"; expected "str"
 ==
-main:5: error: Cannot find implementation or library stub for module named "p.a"
-main:5: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
-main:5: error: Cannot find implementation or library stub for module named "p"
+main:6: error: Import of "p.a" ignored
+main:6: note: (Using --follow-imports=error, module not passed on command line)
 ==
-main:5: error: Cannot find implementation or library stub for module named "p.a"
-main:5: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
-main:5: error: Cannot find implementation or library stub for module named "p"
+main:6: error: Cannot find implementation or library stub for module named "p.a"
+main:6: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
+main:6: error: Cannot find implementation or library stub for module named "p"
 
 
 [case testDeletePackage6]
+# flags: --namespace-packages
 # cmd1: mypy p/a.py p/b.py p/__init__.py
 # cmd2: mypy p/a.py p/b.py
 # cmd3: mypy p/a.py p/b.py
@@ -943,8 +943,8 @@ f(12)
 [out]
 p/b.py:2: error: Argument 1 to "f" has incompatible type "int"; expected "str"
 ==
-p/b.py:1: error: Cannot find implementation or library stub for module named "p.a"
-p/b.py:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
+p/b.py:1: error: Import of "p.a" ignored
+p/b.py:1: note: (Using --follow-imports=error, module not passed on command line)
 ==
 p/b.py:2: error: Argument 1 to "f" has incompatible type "int"; expected "str"