Add test for pack tool

Author: Notgnoshi

tests/mod.rs

@@ -1,4 +1,5 @@
 mod test_bundle;
+mod test_pack;
 
 use std::collections::HashMap;
 use std::path::PathBuf;

tests/test_pack.rs

@@ -0,0 +1,28 @@
+use pretty_assertions::assert_eq;
+
+use crate::{CommandExt, tool};
+
+#[test]
+fn test_pack_four_squares() {
+    let input = b"\
+        POLYGON ((0 0, 0 1, 1 1, 1 0, 0 0))\n\
+        POLYGON ((0 0, 0 1, 1 1, 1 0, 0 0))\n\
+        POLYGON ((0 0, 0 1, 1 1, 1 0, 0 0))\n\
+        POLYGON ((0 0, 0 1, 1 1, 1 0, 0 0))\n\
+    ";
+
+    let expected = "\
+        POLYGON((-0.5 -0.5,-0.5 0.5,0.5 0.5,0.5 -0.5,-0.5 -0.5))\n\
+        POLYGON((1.5 -0.5,1.5 0.5,2.5 0.5,2.5 -0.5,1.5 -0.5))\n\
+        POLYGON((-0.5 1.5,-0.5 2.5,0.5 2.5,0.5 1.5,-0.5 1.5))\n\
+        POLYGON((1.5 1.5,1.5 2.5,2.5 2.5,2.5 1.5,1.5 1.5))\n\
+    ";
+
+    let output = tool("pack")
+        .arg("--width=4")
+        .write_stdin(input)
+        .captured_output();
+    assert!(output.status.success());
+    let stdout = String::from_utf8_lossy(&output.stdout);
+    assert_eq!(expected, stdout);
+}