Expected output whitespace

README.md

@@ -3,15 +3,15 @@
   <p align="center">Test code blocks in your READMEs.</p>
 </p>
 
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@@ -156,5 +156,8 @@ gives
 ```
 ````
 
+Use `expected-output-ignore-whitespace` if you'd like whitespace differences to
+be ignored.
+
 (Conditionally) Skipping the output verfication works by prepending the first
 block with `skip`/`skipif` (see [above](#skipping-code-blocks)).

pyproject.toml

@@ -2,9 +2,6 @@
 requires = ["setuptools>=61"]
 build-backend = "setuptools.build_meta"
 
-[tool.isort]
-profile = "black"
-
 [project]
 name = "pytest_codeblocks"
 authors = [{name = "Nico Schlömer", email = "[email protected]"}]

src/pytest_codeblocks/__about__.py

@@ -1 +1 @@
-__version__ = "0.16.1"
+__version__ = "0.16.2"

src/pytest_codeblocks/main.py

@@ -18,6 +18,7 @@ class CodeBlock:
     lineno: int
     syntax: str | None = None
     expected_output: str | None = None
+    expected_output_ignore_whitespace: bool = False
     importorskip: str | None = None
     marks: list[str] = field(default_factory=lambda: [])
 
@@ -34,6 +35,7 @@ def extract_from_buffer(f, max_num_lines: int = 10000) -> list[CodeBlock]:
     marks = []
     continued_block = None
     expected_output_block = None
+    expected_output_ignore_whitespace = False
     importorskip = None
     k = 1
 
@@ -58,18 +60,21 @@ def extract_from_buffer(f, max_num_lines: int = 10000) -> list[CodeBlock]:
         if m is not None:
             keyword = m.group(1).strip("- ")
             # handle special tags
-            if keyword == "expected-output":
+            if keyword in {"expected-output", "expected-output-ignore-whitespace"}:
                 if len(out) == 0:
                     raise RuntimeError(
-                        "Found <!--pytest-codeblocks-expected-output--> "
+                        f"Found <!--pytest-codeblocks-{keyword}--> "
                         + "but no previous code block."
                     )
                 if out[-1].expected_output is not None:
                     raise RuntimeError(
-                        "Found <!--pytest-codeblocks-expected-output--> "
+                        f"Found <!--pytest-codeblocks-{keyword}--> "
                         + "but block already has expected_output."
                     )
                 expected_output_block = out[-1]
+                if keyword == "expected-output-ignore-whitespace":
+                    # \s: regex matches all whitespace characters
+                    expected_output_ignore_whitespace = True
 
             elif keyword == "cont":
                 if len(out) == 0:
@@ -115,7 +120,7 @@ def extract_from_buffer(f, max_num_lines: int = 10000) -> list[CodeBlock]:
                 marks.append("pytest.mark.xfail")
 
             else:
-                raise RuntimeError(f'Unknown pytest-codeblocks keyword "{keyword}."')
+                raise RuntimeError(f'Unknown pytest-codeblocks keyword "{keyword}"')
 
             continue
 
@@ -162,6 +167,9 @@ def extract_from_buffer(f, max_num_lines: int = 10000) -> list[CodeBlock]:
 
             elif expected_output_block:
                 expected_output_block.expected_output = code
+                expected_output_block.expected_output_ignore_whitespace = (
+                    expected_output_ignore_whitespace
+                )
                 expected_output_block = None
 
             else:

src/pytest_codeblocks/plugin.py

@@ -4,6 +4,7 @@
 #
 import subprocess
 from pathlib import Path
+import re
 
 import pytest
 
@@ -103,7 +104,14 @@ def runtest(self):
             output = ret.stdout.decode()
 
         if output is not None and self.obj.expected_output is not None:
-            if self.obj.expected_output != output:
+            str0 = self.obj.expected_output
+            str1 = output
+
+            if self.obj.expected_output_ignore_whitespace:
+                str0 = re.sub(r"^\s+", "", str0, flags=re.MULTILINE)
+                str1 = re.sub(r"^\s+", "", str1, flags=re.MULTILINE)
+
+            if str0 != str1:
                 raise RuntimeError(
                     f"{self.name}, line {self.obj.lineno}:\n```\n"
                     + f"Expected output\n```\n{self.obj.expected_output}```\n"

tests/test_expected_output.py

@@ -34,3 +34,25 @@ def test_expected_output_fail(testdir):
     testdir.makefile(".md", string)
     result = testdir.runpytest("--codeblocks")
     result.assert_outcomes(failed=1)
+
+
+def test_expected_output_ignore_whitespace(testdir):
+    string = """
+Lorem ipsum
+```python
+print(1 + 3)
+print(1 - 3)
+print(1 * 3)
+```
+dolor sit amet
+<!--pytest-codeblocks:expected-output-ignore-whitespace-->
+```
+ 4
+     -2
+
+  3
+```
+"""
+    testdir.makefile(".md", string)
+    result = testdir.runpytest("--codeblocks")
+    result.assert_outcomes(passed=1)