Add and fix tests

reference/references.jl

@@ -49,6 +49,10 @@ inputs["integrals"] = [
     L"\int \int \int"
 ]
 
+input["linebreaks"] = [
+    L"we clearly see $x = 22$\\and $y > x^2$"
+]
+
 inputs["punctuation"] = [
     L"x!",
     L"23.17",

src/parser/parser.jl

@@ -203,5 +203,11 @@ function texparse(tex ; root = TeXExpr(:lines), showdebug = false)
     if length(stack) > 1
         throw(TeXParseError("unexpected end of input", stack, length(tex), tex))
     end
-    return only(stack)
+
+    lines = only(stack)
+    if length(lines.args) == 1
+        return only(lines.args)
+    else
+        return lines
+    end
 end

test/parser.jl

@@ -1,5 +1,5 @@
 function test_parse(input, args... ; broken=false)
-    arg = (:expr, args...)
+    arg = (:line, args...)
     if broken
         @test_broken texparse(input) == manual_texexpr(arg)
     else
@@ -114,6 +114,12 @@ end
         )
     end
 
+    @testset "Linebreak" begin
+        expr = texparse(L"$A$\\$B$\\$C$")
+        @test expr.head == :lines
+        @test length(expr.args) == 3
+    end
+
     @testset "LaTeXString input" begin
         @test texparse(raw"$\gamma$") == texparse(L"\gamma")
     end