test: command line interface (#63)

Closes #1.

### Summary of Changes

Test the command line interface with `pytest`.

---------

Co-authored-by: lars-reimann <lars-reimann@users.noreply.github.com>

tests/library_analyzer/cli/test_cli.py

@@ -0,0 +1,95 @@
+import subprocess
+
+
+def test_cli_api() -> None:
+    subprocess.run(
+        [
+            "poetry",
+            "run",
+            "analyze-library",
+            "api",
+            "-p",
+            "library_analyzer",
+            "-s",
+            "src",
+            "-o",
+            "out",
+        ],
+        check=True,
+    )
+
+
+def test_cli_usages() -> None:
+    subprocess.run(
+        [
+            "poetry",
+            "run",
+            "analyze-library",
+            "usages",
+            "-p",
+            "library_analyzer",
+            "-c",
+            "library_analyzer",
+            "-o",
+            "out",
+        ],
+        check=True,
+    )
+
+
+def test_cli_annotations() -> None:
+    subprocess.run(
+        [
+            "poetry",
+            "run",
+            "analyze-library",
+            "annotations",
+            "-a",
+            "tests/data/removeAnnotations/api_data.json",
+            "-u",
+            "tests/data/removeAnnotations/usage_data.json",
+            "-o",
+            "out/annotations.json",
+        ],
+        check=True,
+    )
+
+
+def test_cli_all() -> None:
+    subprocess.run(
+        [
+            "poetry",
+            "run",
+            "analyze-library",
+            "all",
+            "-p",
+            "library_analyzer",
+            "-s",
+            "src",
+            "-c",
+            "library_analyzer",
+            "-o",
+            "out",
+        ],
+        check=True,
+    )
+
+
+def test_cli_migration() -> None:
+    subprocess.run(
+        [
+            "poetry",
+            "run",
+            "analyze-library",
+            "migrate",
+            "-a1",
+            "tests/data/migration/apiv1_data.json",
+            "-a2",
+            "tests/data/migration/apiv2_data.json",
+            "-a",
+            "tests/data/migration/annotationv1.json",
+            "-o",
+            "out",
+        ],
+        check=True,
+    )