[staging-intervention] Add unit test

Author: woojiahao

staging_intervention/tests/specs/base.yml

@@ -4,3 +4,11 @@ initialization:
       empty: true
       message: Empty commit
       id: start
+    - type: bash
+      runs: |
+        declare -a names=("josh" "adam" "mary" "jane" "charlie" "kristen" "alice" "john")
+        for name in "${names[@]}"; do
+          touch "$name.txt"
+          git add "$name.txt"
+        done
+        git restore --staged josh.txt adam.txt mary.txt

staging_intervention/tests/specs/extra_unstaged.yml

@@ -0,0 +1,14 @@
+initialization:
+  steps:
+    - type: commit
+      empty: true
+      message: Empty commit
+      id: start
+    - type: bash
+      runs: |
+        declare -a names=("josh" "adam" "mary" "jane" "charlie" "kristen" "alice" "john")
+        for name in "${names[@]}"; do
+          touch "$name.txt"
+          git add "$name.txt"
+        done
+        git restore --staged josh.txt adam.txt mary.txt kristen.txt john.txt

staging_intervention/tests/specs/missing_unstaged.yml

@@ -0,0 +1,14 @@
+initialization:
+  steps:
+    - type: commit
+      empty: true
+      message: Empty commit
+      id: start
+    - type: bash
+      runs: |
+        declare -a names=("josh" "adam" "mary" "jane" "charlie" "kristen" "alice" "john")
+        for name in "${names[@]}"; do
+          touch "$name.txt"
+          git add "$name.txt"
+        done
+        git restore --staged josh.txt adam.txt

staging_intervention/tests/specs/mixed_unstaged.yml

@@ -0,0 +1,14 @@
+initialization:
+  steps:
+    - type: commit
+      empty: true
+      message: Empty commit
+      id: start
+    - type: bash
+      runs: |
+        declare -a names=("josh" "adam" "mary" "jane" "charlie" "kristen" "alice" "john")
+        for name in "${names[@]}"; do
+          touch "$name.txt"
+          git add "$name.txt"
+        done
+        git restore --staged josh.txt adam.txt alice.txt

staging_intervention/tests/test_verify.py

@@ -1,12 +1,34 @@
-from git_autograder import GitAutograderTestLoader
+from git_autograder import GitAutograderTestLoader, assert_output
+from git_autograder.status import GitAutograderStatus
 
-from ..verify import verify
+from ..verify import EXTRA_FILES_UNSTAGED, MISSING_FILES_UNSTAGED, verify
 
 REPOSITORY_NAME = "staging-intervention"
 
 loader = GitAutograderTestLoader(__file__, REPOSITORY_NAME, verify)
 
 
-def test():
-    with loader.load("specs/base.yml", "start"):
-        pass
+def test_base():
+    with loader.load("specs/base.yml", "start") as output:
+        assert_output(output, GitAutograderStatus.SUCCESSFUL)
+
+
+def test_extra_unstaged():
+    with loader.load("specs/extra_unstaged.yml", "start") as output:
+        assert_output(output, GitAutograderStatus.UNSUCCESSFUL, [EXTRA_FILES_UNSTAGED])
+
+
+def test_missing_unstaged():
+    with loader.load("specs/missing_unstaged.yml", "start") as output:
+        assert_output(
+            output, GitAutograderStatus.UNSUCCESSFUL, [MISSING_FILES_UNSTAGED]
+        )
+
+
+def test_mixed_unstaged():
+    with loader.load("specs/mixed_unstaged.yml", "start") as output:
+        assert_output(
+            output,
+            GitAutograderStatus.UNSUCCESSFUL,
+            [EXTRA_FILES_UNSTAGED, MISSING_FILES_UNSTAGED],
+        )