allow functions to call other functions #53

docs/tests.md

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+# Unit tests
+
+- Unit tests are defined in [`./tests`](./../tests)
+- They follow same folder structure as [`./src`](./../src)
+
+## Naming
+
+- Each test suite first describe the system under test
+  - E.g. tests for class `Application` is categorized under `Application`
+- Tests for specific methods are categorized under method name (if applicable)
+  - E.g. test for `run()` is categorized under `run`
+
+## Act, arrange, assert
+
+- Tests use act, arrange and assert (AAA) pattern when applicable
+- **Arrange**
+  - Should set up the test case
+  - Starts with comment line `// arrange`
+- **Act**
+  - Should cover the main thing to be tested
+  - Starts with comment line `// act`
+- **Assert**
+  - Should elicit some sort of response
+  - Starts with comment line `// assert`
+
+## Stubs
+
+- Stubs are defined in [`./tests/stubs`](./../tests/unit/stubs)
+- They implement dummy behavior to be functional