Added context managers

Tests/test_file_ppm.py

@@ -114,17 +114,19 @@ def test_plain_pbm_truncated_data(tmp_path):
     with open(path, "wb") as f:
         f.write(b"P1\n128 128\n")
 
-    with pytest.raises(ValueError):
-        Image.open(path).load()
+    with Image.open(path) as im:
+        with pytest.raises(ValueError):
+            im.load()
 
 
 def test_plain_pbm_invalid_data(tmp_path):
     path = str(tmp_path / "temp.ppm")
     with open(path, "wb") as f:
         f.write(b"P1\n128 128\n1009")
 
-    with pytest.raises(ValueError):
-        Image.open(path).load()
+    with Image.open(path) as im:
+        with pytest.raises(ValueError):
+            im.load()
 
 
 def test_plain_ppm_data_with_comments(tmp_path):
@@ -146,44 +148,49 @@ def test_plain_ppm_truncated_data(tmp_path):
     with open(path, "wb") as f:
         f.write(b"P3\n128 128\n255\n")
 
-    with pytest.raises(ValueError):
-        Image.open(path).load()
+    with Image.open(path) as im:
+        with pytest.raises(ValueError):
+            im.load()
 
 
 def test_plain_ppm_invalid_data(tmp_path):
     path = str(tmp_path / "temp.ppm")
     with open(path, "wb") as f:
         f.write(b"P3\n128 128\n255\n100A")
 
-    with pytest.raises(ValueError):
-        Image.open(path).load()
+    with Image.open(path) as im:
+        with pytest.raises(ValueError):
+            im.load()
 
 
 def test_plain_ppm_half_token_too_long(tmp_path):
     path = str(tmp_path / "temp.ppm")
     with open(path, "wb") as f:
         f.write(b"P3\n128 128\n255\n012345678910")
 
-    with pytest.raises(ValueError):
-        Image.open(path).load()
+    with Image.open(path) as im:
+        with pytest.raises(ValueError):
+            im.load()
 
 
 def test_plain_ppm_token_too_long(tmp_path):
     path = str(tmp_path / "temp.ppm")
     with open(path, "wb") as f:
         f.write(b"P3\n128 128\n255\n012345678910 0")
 
-    with pytest.raises(ValueError):
-        Image.open(path).load()
+    with Image.open(path) as im:
+        with pytest.raises(ValueError):
+            im.load()
 
 
 def test_plain_ppm_value_too_large(tmp_path):
     path = str(tmp_path / "temp.ppm")
     with open(path, "wb") as f:
         f.write(b"P3\n128 128\n255\n256")
 
-    with pytest.raises(ValueError):
-        Image.open(path).load()
+    with Image.open(path) as im:
+        with pytest.raises(ValueError):
+            im.load()
 
 
 def test_not_ppm(tmp_path):
@@ -206,7 +213,8 @@ def test_nondecimal_header(tmp_path):
         f.write(b"P6\n128\x00")
 
     with pytest.raises(ValueError):
-        Image.open(path)
+        with Image.open(path):
+            pass
 
 
 def test_header_token_too_long(tmp_path):
@@ -215,7 +223,8 @@ def test_header_token_too_long(tmp_path):
         f.write(b"P6\n 012345678910")
 
     with pytest.raises(ValueError):
-        Image.open(path)
+        with Image.open(path):
+            pass
 
 
 def test_too_many_colors(tmp_path):
@@ -224,7 +233,8 @@ def test_too_many_colors(tmp_path):
         f.write(b"P6\n1 1\n1000\n")
 
     with pytest.raises(ValueError):
-        Image.open(path)
+        with Image.open(path):
+            pass
 
 
 def test_truncated_header(tmp_path):