Better paragraph layout tests ✅

tests/typ/text/align.typ

@@ -0,0 +1,28 @@
+// Test text alignment.
+
+---
+// Test that alignment depends on the paragraph's full width.
+#rect[
+    Hello World \
+    #align(right)[World]
+]
+
+---
+// Test that a line with multiple alignments respects the paragraph's full
+// width.
+#rect[
+    Hello #align(center)[World] \
+    Hello from the World
+]
+
+---
+// Test that `start` alignment after `end` alignment doesn't do anything until
+// the next line break ...
+L #align(right)[R] R
+
+// ... but make sure it resets to left after the line break.
+L #align(right)[R] \ L
+
+---
+// FIXME: There should be a line break opportunity on alignment change.
+LLLLLLLLLLLLL#align(center)[CCCC]

tests/typ/text/basic.typ

@@ -1,6 +1,7 @@
 // Test simple text.
 
-#page(width: 250pt)
+---
+#page(width: 250pt, height: 110pt)
 
 But, soft! what light through yonder window breaks? It is the east, and Juliet
 is the sun. Arise, fair sun, and kill the envious moon, Who is already sick and

tests/typ/text/chinese.typ

@@ -0,0 +1,9 @@
+// Test chinese text from Wikipedia.
+
+---
+#font("Noto Serif CJK SC")
+
+是美国广播公司电视剧《迷失》第3季的第22和23集，也是全剧的第71集和72集
+由执行制作人戴蒙·林道夫和卡尔顿·库斯编剧，导演则是另一名执行制作人杰克·本德
+节目于2007年5月23日在美国和加拿大首播，共计吸引了1400万美国观众收看
+本集加上插播广告一共也持续有两个小时

tests/typ/text/linebreaks.typ

@@ -1,35 +1,28 @@
-// Test line breaking.
+// Test line breaking special cases.
 
 ---
-// Test normal line breaking.
-But, soft! what light through yonder window breaks? It is the east, and Juliet
-is the sun. Arise, fair sun, and kill the envious moon, Who is already sick and
-pale with grief hard.
+// Test overlong word that is not directly after a hard break.
+This is a spaceexceedinglylongishy.
 
-// From Wikipedia:
-#font("Noto Serif CJK SC")
-是美国广播公司电视剧《迷失》第3季的第22和23集，也是全剧的第71集和72集
-由执行制作人戴蒙·林道夫和卡尔顿·库斯编剧，导演则是另一名执行制作人杰克·本德
-节目于2007年5月23日在美国和加拿大首播，共计吸引了1400万美国观众收看
-本集加上插播广告一共也持续有两个小时
+---
+// Test two overlong words in a row.
+Supercalifragilisticexpialidocious Expialigoricmetrioxidation.
+
+---
+// Test that there are no unwanted line break opportunities on run change.
+This is partly emph_as_ized.
+
+---
+Hard \ break.
 
 ---
 // Test hard break directly after normal break.
-But, soft! What light through \ yonder window breaks?
+Hard break directly after \ normal break.
 
 ---
 // Test consecutive breaks.
-But, soft! Whatlightdoyoueveryonderthrough window breaks? Why did the window
-even \ break \ \ in the first place.
-
----
-// Test two superlong words in a row.
-Supercalifragilisticousalogy Expialigoricmetrioxidationreagent.
-
----
-// Test run change after space.
-Left #font("PT Sans")[Right].
+Two consecutive \ \ breaks and three \ \ \ more.
 
 ---
 // Test trailing newline.
-Trailing newline{"\n"}
+Trailing break \

tests/typ/text/whitespace.typ

@@ -0,0 +1,17 @@
+// Test whitespace handling.
+
+---
+// Test that a run consisting only of whitespace isn't trimmed.
+A#font("PT Sans")[ ]B
+
+---
+// Test font change after space.
+Left #font("PT Sans")[Right].
+
+---
+// Test that space at start of line is not trimmed.
+A{"\n"} B
+
+---
+// Test that trailing space does not force a line break.
+LLLLLLLLLLLLLL R _L_