Add basic test for the assess_min_commits plugin

tests/conftest.py

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+import pytest
+from egrader.git import git_at
+
+
+@pytest.fixture
+def git_repo_empty(tmp_path):
+    git_at(tmp_path, "init")
+    return tmp_path

tests/plugins/__init__.py

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+"""Plugin tests."""

tests/plugins/test_repo.py

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+from pathlib import Path
+from egrader.git import git_at
+from egrader.types import StudentGit
+from egrader.plugins.repo import assess_min_commits
+
+def do_tmpfile_commit(tmp_file_path: Path):
+    with open(tmp_file_path, 'a') as tmp_file:
+        tmp_file.write('Some more text')
+    git_at(tmp_file_path.parent, "add", tmp_file_path.name)
+    git_at(tmp_file_path.parent, 'commit', '-m', '"Yet another commit"')
+
+def test_repo_assess_min_commits_no(git_repo_empty):
+    some_file_path = Path(git_repo_empty, 'some_file.txt')
+    do_tmpfile_commit(some_file_path)
+    stdgit = StudentGit('', '', '')
+    result = assess_min_commits(stdgit, str(git_repo_empty), 2)
+    assert result == 0
+
+def test_repo_assess_min_commits_yes(git_repo_empty):
+    some_file_path = Path(git_repo_empty, 'some_file.txt')
+    do_tmpfile_commit(some_file_path)
+    do_tmpfile_commit(some_file_path)
+    do_tmpfile_commit(some_file_path)
+    stdgit = StudentGit('', '', '')
+    result = assess_min_commits(stdgit, str(git_repo_empty), 2)
+    assert result == 1