Add tests/test_analyzer.py

Author: Rohan5commit

tests/test_analyzer.py

@@ -0,0 +1,72 @@
+"""Tests for analyzer module."""
+
+from roast.analyzer import AI_SLOP, CODE_QUALITY, STYLE, analyze
+from roast.scanner import FileResult
+
+
+def test_todo_comments_generate_ai_slop_issues() -> None:
+    file = FileResult(
+        path="app/main.py",
+        content=(
+            "# TODO: clean this\n"
+            "x = 1\n"
+            "# FIXME: replace later\n"
+            "y = 2\n"
+            "# HACK: temporary workaround\n"
+        ),
+        language="python",
+        line_count=5,
+    )
+    report = analyze([file])
+    todo_issues = [
+        issue
+        for issue in report.issues
+        if issue.category == AI_SLOP and "TODO/FIXME/HACK marker" in issue.description
+    ]
+    assert len(todo_issues) == 3
+
+
+def test_function_over_50_lines_generates_code_quality_issue() -> None:
+    long_body = "\n".join("    x += 1" for _ in range(51))
+    content = f"def massive_function():\n    x = 0\n{long_body}\n    return x\n"
+    file = FileResult(
+        path="app/logic.py",
+        content=content,
+        language="python",
+        line_count=content.count("\n"),
+    )
+    report = analyze([file])
+    long_fn_issues = [
+        issue
+        for issue in report.issues
+        if issue.category == CODE_QUALITY and "exceeds 50 lines" in issue.description
+    ]
+    assert len(long_fn_issues) == 1
+
+
+def test_scores_are_clamped_to_zero_minimum() -> None:
+    slop_lines = "\n".join("# TODO: fix me" for _ in range(20))
+    file = FileResult(
+        path="bad/file.py",
+        content=slop_lines,
+        language="python",
+        line_count=20,
+    )
+    report = analyze([file])
+    assert report.scores[AI_SLOP] == 0
+    assert report.scores[CODE_QUALITY] >= 0
+    assert report.scores[STYLE] >= 0
+    assert report.scores["Overall"] >= 0
+
+
+def test_empty_files_are_handled_without_error() -> None:
+    file = FileResult(
+        path="empty.py",
+        content="",
+        language="python",
+        line_count=0,
+    )
+    report = analyze([file])
+    assert report.total_files == 1
+    assert report.total_lines == 0
+    assert report.issues == []