Added hello world import error test.

Author: BethanyG

test/example-hello-world-function-import-error/example_hello_world_function_import_error.py

@@ -0,0 +1,2 @@
+print("Hello, World!")
+

test/example-hello-world-function-import-error/example_hello_world_function_import_error_test.py

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+import unittest
+
+try:
+    from hello_world import (
+        hello,
+    )
+
+except ImportError as import_fail:
+    message = import_fail.args[0].split("(", maxsplit=1)
+    item_name = import_fail.args[0].split()[3]
+
+    item_name = item_name[:-1] + "()'"
+
+    # pylint: disable=raise-missing-from
+    raise ImportError(
+        "\n\nMISSING FUNCTION --> In your 'hello_world.py' file, we can not find or import the"
+        f" function named {item_name}. \nThe tests for this first exercise expect a function that"
+        f' returns the string "Hello, World!"'
+        f'\n\nDid you use print("Hello, World!") instead?'
+    ) from None
+
+
+class HelloWorldTest(unittest.TestCase):
+    def test_say_hi(self):
+        msg = "\n\nThis test expects a return of the string 'Hello, World!' \nDid you use print('Hello, World!') by mistake?"
+        self.assertEqual(hello(), "Hello, World!", msg=msg)

test/example-hello-world-function-import-error/results.json

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+{
+  "version": 3,
+  "status": "error",
+  "message": "ImportError: \n\nMISSING FUNCTION --> In your 'hello_world.py' file, we can not find or import the function named 'hello_world()'. \nThe tests for this first exercise expect a function that returns the string \"Hello, World!\"\n\nDid you use print(\"Hello, World!\") instead?",
+  "tests": []
+}