Add tests for app/print_table.py (#15)

* Add tests for app/print_table.py

* Exclude app/version and app/args from coverage

* Remove app/main from coverage (just uses other modules)

tests/test_print_table.py

@@ -0,0 +1,19 @@
+#!/usr/bin/env python3
+
+"""MODULE: Provides test cases for app/print_table.py."""
+
+from app.print_table import generate_prefix_string  # pragma: no cover
+
+
+def test_generate_prefix_string_small() -> None:
+    """TEST: Verifies if a small prefix list results in one line."""
+    test_query = ["abc", "def"]
+    result = generate_prefix_string(prefixes=test_query)
+    assert result == "abc, def\n"
+
+
+def test_generate_prefix_string_large() -> None:
+    """TEST: Verifies if a large prefix list results in multiple lines."""
+    test_query = ["abc", "def", "ghi", "jkl", "mno", "pqr"]
+    result = generate_prefix_string(prefixes=test_query)
+    assert result == "abc, def, ghi, jkl\nmno, pqr\n"