Update the test generator: comments error handling and bool to string

bin/generate_tests

@@ -77,19 +77,38 @@ def filter_tojson(data, separators=(',', ':'), indent=None) -> str:
 def jinja_env(exercise: pathlib.Path) -> jinja2.Environment:
     """Return a configured Jinja env with filters added."""
     env = jinja2.Environment(loader=jinja2.FileSystemLoader(exercise / ".meta"))
+    # Shell quoting
     env.filters["quote"] = shlex.quote
+    # JSON formatting, default to compact form (`jq -c`).
     env.filters["tojson"] = filter_tojson
+    # String escaping, ANSI-C style.
     env.filters["repr"] = repr
+    # Return a dict with only specified keys kepts.
     env.filters["camel_to_snake"] = lambda x: re.sub(r"([a-z])([A-Z])", (lambda m: f"{m.group(1)}_{m.group(2).lower()}"), x)
     env.filters["format_list"] = lambda x: shlex.quote(
         "[" + ",".join(f'"{i}"' if isinstance(i, str) else str(i) for i in x) + "]"
     )
     return env
 
 
+def bool_to_str(obj):
+    """Convert boolean values to strings."""
+    if isinstance(obj, dict):
+        return {key: bool_to_str(val) for key, val in obj.items()}
+    if isinstance(obj, list):
+        return [bool_to_str(val) for val in obj]
+    if obj is True:
+        return "true"
+    if obj is False:
+        return "false"
+    return obj
+
+
 def generate(specs: pathlib.Path, exercise: pathlib.Path) -> None:
     """Generate and write test file for a given spec and exercise."""
     cases = get_cases(specs, exercise)
+    for case in cases:
+        case["expected"] = bool_to_str(case["expected"])
 
     timestamp = datetime.datetime.now(tz=datetime.UTC).replace(microsecond=0).isoformat()
     header = textwrap.dedent(f"""\
@@ -106,7 +125,12 @@ def generate(specs: pathlib.Path, exercise: pathlib.Path) -> None:
     }
 
     # Render the template.
-    out = jinja_env(exercise).get_template("template.j2").render(data).strip()
+    try:
+        template = jinja_env(exercise).get_template("template.j2")
+        out = template.render(data)
+    except jinja2.exceptions.TemplateAssertionError as e:
+        e.add_note(f"Error rendering template for {exercise.name}")
+        raise
 
     # Check for changes or the lack thereof.
     test_file = exercise / json.loads((exercise / ".meta/config.json").read_text())["files"]["test"][0]

exercises/practice/allergies/.meta/template.j2

@@ -6,7 +6,7 @@
     run bash {{ solution }} {{ case["input"]["score"] }} allergic_to {{ case["input"]["item"] }}
 
     assert_success
-    assert_output "{{ case["expected"] | lower }}"
+    assert_output "{{ case["expected"] }}"
 {%- else %}
     run bash {{ solution }} {{ case["input"]["score"] }} list
 

exercises/practice/armstrong-numbers/.meta/template.j2

@@ -4,6 +4,6 @@
   {% if idx == 0 %}# {% endif %}[[ $BATS_RUN_SKIPPED == "true" ]] || skip
   run bash {{ solution }} {{ case["input"]["number"] }}
   assert_success
-  assert_output "{{ case["expected"] | lower }}"
+  assert_output "{{ case["expected"] }}"
 }
 {% endfor %}

exercises/practice/isbn-verifier/.meta/template.j2

@@ -4,6 +4,6 @@
   {% if idx == 0 %}# {% endif %}[[ $BATS_RUN_SKIPPED == "true" ]] || skip
   run bash {{ solution }} '{{ case["input"]["isbn"] }}'
   assert_success
-  assert_output "{{ case["expected"] | lower }}"
+  assert_output "{{ case["expected"] }}"
 }
 {% endfor %}

exercises/practice/isogram/.meta/template.j2

@@ -4,6 +4,6 @@
   {% if idx == 0 %}# {% endif %}[[ $BATS_RUN_SKIPPED == "true" ]] || skip
   run bash {{ solution }} '{{ case["input"]["phrase"] }}'
   assert_success
-  assert_output "{{ case["expected"] | lower }}"
+  assert_output "{{ case["expected"] }}"
 }
 {% endfor %}

exercises/practice/leap/.meta/template.j2

@@ -5,7 +5,7 @@
   run bash {{ solution }} {{ case["input"]["year"] }}
 
   assert_success
-  assert_output "{{ case["expected"] | lower }}"
+  assert_output "{{ case["expected"] }}"
 }
 {% endfor %}
 @test 'No input should return an error' {

exercises/practice/luhn/.meta/template.j2

@@ -4,6 +4,6 @@
   {% if idx == 0 %}# {% endif %}[[ $BATS_RUN_SKIPPED == "true" ]] || skip
   run bash {{ solution }} "{{ case["input"]["value"] }}"
   assert_success
-  assert_output "{{ case["expected"] | lower }}"
+  assert_output "{{ case["expected"] }}"
 }
 {% endfor %}

exercises/practice/matching-brackets/.meta/template.j2

@@ -4,6 +4,6 @@
     {% if idx == 0 %}# {% endif %}[[ $BATS_RUN_SKIPPED == "true" ]] || skip
     run bash {{ solution }} "{{ case["input"]["value"] }}"
     assert_success
-    assert_output "{{ case["expected"] | lower }}"
+    assert_output "{{ case["expected"] }}"
 }
 {% endfor %}

exercises/practice/pangram/.meta/template.j2

@@ -4,6 +4,6 @@
   {% if idx == 0 %}# {% endif %}[[ $BATS_RUN_SKIPPED == "true" ]] || skip
   run bash {{ solution }} '{{ case["input"]["sentence"] }}'
   assert_success
-  assert_output "{{ case["expected"] | lower }}"
+  assert_output "{{ case["expected"] }}"
 }
 {% endfor %}

exercises/practice/pythagorean-triplet/pythagorean_triplet.bats

@@ -1,8 +1,7 @@
 #!/usr/bin/env bats
 load bats-extra
 
-# generated on 2026-06-29T06:52:43+00:00
-# local version: 2.0.0.0
+# generated on 2026-06-30T03:19:10+00:00
 
 @test "triplets whose sum is 12" {
     # [[ $BATS_RUN_SKIPPED == "true" ]] || skip

exercises/practice/satellite/satellite.bats

@@ -1,8 +1,7 @@
 #!/usr/bin/env bats
 load bats-extra
 
-# generated on 2026-06-28T23:19:01+00:00
-# local version: 2.0.0.0
+# generated on 2026-06-30T03:19:10+00:00
 
 @test "Empty tree" {
   # [[ $BATS_RUN_SKIPPED == "true" ]] || skip

exercises/practice/triangle/.meta/template.j2

@@ -4,6 +4,6 @@
   {% if idx == 0 %}# {% endif %}[[ $BATS_RUN_SKIPPED == "true" ]] || skip
   run bash {{ solution }} {{ case["property"] }} {{ case["input"]["sides"] | join(" ") }}
   assert_success
-  assert_output "{{ case["expected"] | lower }}"
+  assert_output "{{ case["expected"] }}"
 }
 {% endfor %}