Add tests for importing __main__.hy files

Closes hylang/hy#1466.

tests/importer/test_importer.py

@@ -24,9 +24,31 @@ from hy.importer import hy_parse, HyLoader, cache_from_source
 def test_basics():
     "Make sure the basics of the importer work"
 
-    basic_namespace = runpy.run_path("tests/resources/importer/basic.hy",
-                                     run_name='__main__')
-    assert 'square' in basic_namespace
+    assert os.path.isfile('tests/resources/__init__.py')
+    resources_mod = importlib.import_module('tests.resources')
+    assert hasattr(resources_mod, 'kwtest')
+
+    assert os.path.isfile('tests/resources/bin/__init__.hy')
+    bin_mod = importlib.import_module('tests.resources.bin')
+    assert hasattr(bin_mod, '_null_fn_for_import_test')
+
+
+def test_runpy():
+    # XXX: `runpy` won't update cached bytecode!  Don't know if that's
+    # intentional or not.
+
+    basic_ns = runpy.run_path('tests/resources/importer/basic.hy')
+    assert 'square' in basic_ns
+
+    main_ns = runpy.run_path('tests/resources/bin')
+    assert main_ns['visited_main'] == 1
+    del main_ns
+
+    main_ns = runpy.run_module('tests.resources.bin')
+    assert main_ns['visited_main'] == 1
+
+    with pytest.raises(IOError):
+        runpy.run_path('tests/resources/foobarbaz.py')
 
 
 def test_stringer():

tests/resources/bin/__main__.hy

@@ -0,0 +1,2 @@
+(print "This is a __main__.hy")
+(setv visited_main True)

tests/test_bin.py

@@ -328,6 +328,18 @@ def test_bin_hy_module_main():
     assert "Hello World" in output
 
 
+def test_bin_hy_module_main_file():
+    output, _ = run_cmd("hy -m tests.resources.bin")
+    assert "This is a __main__.hy" in output
+
+    output, _ = run_cmd("hy -m .tests.resources.bin", expect=1)
+
+
+def test_bin_hy_file_main_file():
+    output, _ = run_cmd("hy tests/resources/bin")
+    assert "This is a __main__.hy" in output
+
+
 def test_bin_hy_module_main_args():
     output, _ = run_cmd("hy -m tests.resources.bin.main test 123")
     assert "test" in output