Add more .include test cases

stdlib/src/main/kotlin/eu/iamgio/quarkdown/stdlib/Ecosystem.kt

@@ -30,6 +30,8 @@ fun include(
     // Read file content
     val file = file(context, path)
     val raw = "\n" + file.readText()
+    // The initial line break is a workaround for an issue that may cause blocks at the beginning of the file
+    // to be not recognized as blocks - which happens in transitive inclusions (aka a nested .include called from an included file).
 
     // Evaluate the Quarkdown source.
     // This automatically converts the source into a value (e.g. a node, a string, a number, etc.)

test/src/test/kotlin/eu/iamgio/quarkdown/test/FullPipelineTest.kt

@@ -556,5 +556,17 @@ class FullPipelineTest {
                 it,
             )
         }
+
+        // Included file used as a value.
+        execute(
+            """
+            .sum {.include {include/include-6.md}} {3}
+            """.trimIndent(),
+        ) {
+            assertEquals(
+                "<p>8</p>",
+                it,
+            )
+        }
     }
 }

test/src/test/resources/data/include/include-6.md

@@ -0,0 +1,4 @@
+.function {mynumber}
+    .sum {3} {2}
+
+.mynumber