Wrote simple integration tests

Author: JessicaTegner

tests/input/invalid_syntax.txt

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+result := 1+2

tests/input/successful.txt

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+result is 1+2

tests/test_integration.py

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+# As of right now all tests can be run by either one of the following commands in the terminal:
+# python -m unittest discover -s ./tests -p test_*.py
+# python -m unittest discover -s tests
+from unittest import TestCase
+import subprocess
+import os
+import shutil
+
+class TestCompilerRun(TestCase):
+    def setUp(self):
+        self.test_working_directory = os.path.dirname(os.path.abspath(__file__))
+        self.output_directory = os.path.join(self.test_working_directory, 'output')
+        self.input_directory = os.path.join(self.test_working_directory, 'input')
+        self.compiler_path = os.path.join(self.test_working_directory, '../compiler.py')
+        # if the output directory exists, delete it and if it doesn't exist, create it
+        if os.path.exists(self.output_directory):
+            shutil.rmtree(self.output_directory)
+        os.makedirs(self.output_directory)
+
+    def tearDown(self):
+        shutil.rmtree(self.output_directory)
+
+    def test_complete_compiler_run_should_be_successful(self):
+        source_file = os.path.join(self.input_directory, 'successful.txt')
+        output_file = os.path.join(self.output_directory, 'output_successful.py')
+        subprocess.run(["poetry", "run", "python", self.compiler_path, source_file, "-o", output_file], check=True)
+        self.assertTrue(os.path.exists(output_file))
+        with open(output_file, 'r') as file:
+            content = file.read()
+            self.assertIn("result = (1 + 2)", content)
+
+    def test_compiler_run_with_invalid_syntax_should_fail(self):
+        source_file = os.path.join(self.input_directory, 'invalid_syntax.txt')
+        output_file = os.path.join(self.output_directory, 'output_invalid_syntax.py')
+        with self.assertRaises(subprocess.CalledProcessError):
+            subprocess.run(["poetry", "run", "python", self.compiler_path, source_file, "-o", output_file], check=True)