Add FieldBlock test, correct parameter restrictions.

src/main/kotlin/info/mking/k2zpl/builder/Extensions.kt

@@ -3,7 +3,6 @@
 package info.mking.k2zpl.builder
 
 import info.mking.k2zpl.command.EndFormat
-import info.mking.k2zpl.command.FieldBlock
 import info.mking.k2zpl.command.FieldData
 import info.mking.k2zpl.command.FieldOrientation
 import info.mking.k2zpl.command.FieldOrigin
@@ -18,27 +17,8 @@ import info.mking.k2zpl.command.ZplCommand
 import info.mking.k2zpl.command.options.ZplFieldOrientation
 import info.mking.k2zpl.command.options.ZplFont
 import info.mking.k2zpl.command.options.ZplPrintSpeed
-import info.mking.k2zpl.command.options.ZplTextAlignment
 import info.mking.k2zpl.command.options.ZplYesNo
 
-/**
- * Formats a text block.
- * @param width The width of the text block.
- * @param lines The number of lines in the text block.
- * @param lineSpacing The space between lines.
- * @param alignment The text alignment within the block.
- * @param hangingIndent The hanging indent for the block.
- */
-fun ZplBuilder.fieldBlock(width: Int, lines: Int, lineSpacing: Int, alignment: ZplTextAlignment, hangingIndent: Int) {
-    command(FieldBlock(
-        width = width,
-        lines = lines,
-        lineSpacing = lineSpacing,
-        alignment = alignment,
-        hangingIndent = hangingIndent
-    ))
-}
-
 /**
  * Sets the field orientation for text fields.
  * @param orientation The orientation of the field.

src/main/kotlin/info/mking/k2zpl/command/FieldBlock.kt

@@ -1,19 +1,55 @@
 package info.mking.k2zpl.command
 
+import info.mking.k2zpl.builder.ZplBuilder
+import info.mking.k2zpl.builder.command
 import info.mking.k2zpl.command.options.ZplTextAlignment
 
 internal data class FieldBlock(
-    val width: Int, val lines: Int, val lineSpacing: Int, val alignment: ZplTextAlignment, val hangingIndent: Int
+    val width: Int,
+    val maxLines: Int,
+    val lineSpacing: Int,
+    val alignment: ZplTextAlignment,
+    val hangingIndent: Int
 ) : ZplCommand {
     init {
         require(width in 1..32000) { "Width must be between 1 and 32000" }
-        require(lines in 1..999) { "Lines must be between 1 and 999" }
-        require(lineSpacing in 0..32000) { "Line spacing must be between 0 and 32000" }
-        require(hangingIndent in 0..32000) { "Hanging indent must be between 0 and 32000" }
+        require(maxLines in 1..9999) { "Lines must be between 1 and 9999" }
+        require(lineSpacing in -9999..9999) { "Line spacing must be between -9999 and 9999" }
+        require(hangingIndent in 0..9999) { "Hanging indent must be between 0 and 9999" }
     }
 
     override val command: CharSequence = "^FB"
     override val parameters: LinkedHashMap<CharSequence, Any?> = linkedMapOf(
-        "w" to width, "l" to lines, "s" to lineSpacing, "a" to alignment.code, "h" to hangingIndent
+        "w" to width,
+        "l" to maxLines,
+        "s" to lineSpacing,
+        "a" to alignment.code,
+        "h" to hangingIndent
     )
-}
+}
+
+/**
+ * Formats a text block.
+ * @param width The width of the text block.
+ * @param maxLines The number of lines in the text block.
+ * @param lineSpacing The space between lines.
+ * @param alignment The text alignment within the block.
+ * @param hangingIndent The hanging indent for the block.
+ */
+fun ZplBuilder.fieldBlock(
+    width: Int,
+    maxLines: Int = 1,
+    lineSpacing: Int = 0,
+    alignment: ZplTextAlignment = ZplTextAlignment.LEFT,
+    hangingIndent: Int = 0
+) {
+    command(
+        FieldBlock(
+            width = width,
+            maxLines = maxLines,
+            lineSpacing = lineSpacing,
+            alignment = alignment,
+            hangingIndent = hangingIndent
+        )
+    )
+}

src/main/kotlin/info/mking/k2zpl/command/options/ZplTextAlignment.kt

@@ -6,5 +6,9 @@ enum class ZplTextAlignment(val code: Char) {
     LEFT('L'),
     CENTER('C'),
     RIGHT('R'),
-    JUSTIFY('J')
+    JUSTIFY('J');
+
+    override fun toString(): String {
+        return code.toString()
+    }
 }

src/test/kotlin/info/mking/k2zpl/command/FieldBlockTest.kt

@@ -0,0 +1,73 @@
+package info.mking.k2zpl.command
+
+import info.mking.k2zpl.command.options.ZplTextAlignment
+import info.mking.k2zpl.k2zpl
+import info.mking.k2zpl.testBuildString
+import io.kotest.assertions.throwables.shouldThrow
+import io.kotest.core.spec.IsolationMode
+import io.kotest.core.spec.style.DescribeSpec
+import io.kotest.data.forAll
+import io.kotest.data.headers
+import io.kotest.data.row
+import io.kotest.data.table
+import io.kotest.matchers.shouldBe
+
+class FieldBlockTest : DescribeSpec({
+    isolationMode = IsolationMode.InstancePerLeaf
+
+    val fieldBlock = FieldBlock(
+        width = 10,
+        maxLines = 1,
+        lineSpacing = 10,
+        alignment = ZplTextAlignment.LEFT,
+        hangingIndent = 0
+    )
+
+    describe("FieldBlock") {
+        it("outputs correct command") {
+            fieldBlock.testBuildString() shouldBe "^FB10,1,10,L,0"
+        }
+        it("requires valid parameters") {
+            table(
+                headers("width", "maxLines", "lineSpacing", "hangingIndent"),
+                row(0, 1, 1, 0),
+                row(32001, 1, 1, 0),
+                row(1, 0, 1, 0),
+                row(1, 10000, 1, 0),
+                row(1, 1, -10000, 0),
+                row(1, 1, 10000, 0),
+                row(1, 1, 1, -1),
+                row(1, 1, 1, 10000)
+            ).forAll { width, maxLines, lineSpacing, hangingIndent ->
+                shouldThrow<IllegalArgumentException> {
+                    fieldBlock.copy(
+                        width = width,
+                        maxLines = maxLines,
+                        lineSpacing = lineSpacing,
+                        hangingIndent = hangingIndent
+                    )
+                }
+            }
+        }
+        it("uses alignment parameter correctly") {
+            ZplTextAlignment.entries.forEach {
+                fieldBlock.copy(alignment = it).testBuildString() shouldBe "^FB10,1,10,$it,0"
+            }
+        }
+    }
+    describe("fieldBlock extension function") {
+        it("outputs correct command") {
+            val result = k2zpl {
+                fieldBlock(width = 100, maxLines = 10, lineSpacing = 10, alignment = ZplTextAlignment.CENTER, hangingIndent = 10)
+            }
+            result shouldBe "^FB100,10,10,C,10\n"
+        }
+        it("outputs correct command with default parameters") {
+            val result = k2zpl {
+                fieldBlock(width = 100)
+            }
+            result shouldBe "^FB100,1,0,L,0\n"
+        }
+
+    }
+})