test: README: Fixed typo

- test_checkers.py  instead of test_checker.py
- Fixed spelling of "variable"

test/README.md

@@ -89,7 +89,7 @@ mapping_test_data = [
 
 To make the basic test suite run quickly, we create "faked" binary files to test the **CVE mappings**.  However, we want to be able to test real files to test that the **signatures** work on real-world data.
 
-You can see test data for package tests in *package_test_data* varible of the test data file you are writing test for.
+You can see test data for package tests in *package_test_data* variable of the test data file you are writing test for.
 
 We have `test_version_in_package` function in `test_scanner` that takes a *url*, and *package name*, *module name* and a *version*, and downloads the package, runs the scanner against it, and makes sure it is the package that you've specified. But we need more tests!
 
@@ -137,7 +137,7 @@ For ease of maintenance, please keep the parametrize list in alphabetical order
 
 You can then run your new test using pytest:
 ```console
-pytest test/test_checker.py
+pytest test/test_checkers.py
 ```
 
 You can also use all the pytest functionality to run groups of tests.  For example, this will run the python-related tests (but not the bluetooth one):