diff --git a/tests/test_math_format.py b/tests/test_math_format.py
index f885a3b..93def03 100644
--- a/tests/test_math_format.py
+++ b/tests/test_math_format.py
@@ -13,14 +13,8 @@ def test_unicode_mode_converts_indices_exponents_and_symbols():
     assert result == "z₁ + x² + xᵢ₊₁ + α + ∞"
 
 
-def test_unicode_mode_converts_common_operators():
-    result = format_math_text(r"\int_0^1 f(x) dx \leq \sum_(k=1)^n a_k", "unicode")
-
-    assert result == "∫₀¹ f(x) dx ≤ ∑ₖ₌₁ⁿ aₖ"
-
-
-def test_word_equation_segments_keep_word_unicodemath_syntax():
-    segments = split_word_equation_segments(r"On pose z_1 = x + iy. Puis \alpha = 2.")
+def test_marker_mode_only_uses_explicit_equation_blocks():
+    segments = split_word_equation_segments(r"On pose [EQ]z_1 = x + iy[/EQ]. Puis [EQ]\alpha = 2[/EQ].")
 
     assert [(segment.kind, segment.value) for segment in segments] == [
         ("text", "On pose "),
@@ -31,6 +25,23 @@ def test_word_equation_segments_keep_word_unicodemath_syntax():
     ]
 
 
+def test_marker_mode_does_not_guess_math_without_markers():
+    segments = split_word_equation_segments(r"z_1 reste du texte normal sans marqueur.")
+
+    assert [(segment.kind, segment.value) for segment in segments] == [
+        ("text", r"z_1 reste du texte normal sans marqueur."),
+    ]
+
+
+def test_unclosed_equation_marker_consumes_the_rest():
+    segments = split_word_equation_segments(r"Résultat: [EQ]x^2 + 1")
+
+    assert [(segment.kind, segment.value) for segment in segments] == [
+        ("text", "Résultat: "),
+        ("equation", "x^2 + 1"),
+    ]
+
+
 def test_invalid_math_text_format_is_rejected():
     with pytest.raises(ValueError):
         format_math_text("x_1", "bad")