Add failing test for issue #53: per-package target setting

This test demonstrates the bug where per-package target settings
are ignored. The test will fail with the current code, showing:

Expected: custom-dir/package.with.custom.target
Actual: ./sources/package.with.custom.target

The bug is in config.py line 103, which uses the default-target
variable instead of the package's individual target setting.

Related to #53

Author: jensens

tests/data/config_samples/config_with_custom_target.ini

@@ -0,0 +1,14 @@
+[settings]
+default-target = ./sources
+docs-directory = documentation
+
+[package.with.default.target]
+url = https://github.com/example/package1.git
+
+[package.with.custom.target]
+url = https://github.com/example/package2.git
+target = custom-dir
+
+[package.with.interpolated.target]
+url = https://github.com/example/docs.git
+target = ${settings:docs-directory}

tests/test_config.py

@@ -185,3 +185,32 @@ def test_configuration_package_defaults():
     assert pkg["install-mode"] == "direct"  # default mode
     assert pkg["vcs"] == "git"
     assert "path" in pkg
+
+
+def test_per_package_target_override():
+    """Test that per-package target setting overrides default-target.
+
+    This test demonstrates issue #53: the target setting for individual
+    packages should override the default-target setting.
+    """
+    from mxdev.config import Configuration
+
+    base = pathlib.Path(__file__).parent / "data" / "config_samples"
+    config = Configuration(str(base / "config_with_custom_target.ini"))
+
+    # Package without custom target should use default-target
+    pkg_default = config.packages["package.with.default.target"]
+    assert pkg_default["target"] == "./sources"
+    assert pkg_default["path"] == "./sources/package.with.default.target"
+
+    # Package with custom target should use its own target
+    pkg_custom = config.packages["package.with.custom.target"]
+    assert pkg_custom["target"] == "custom-dir"
+    # BUG: This will fail because config.py uses wrong variable at line 103
+    assert pkg_custom["path"] == "custom-dir/package.with.custom.target"
+
+    # Package with interpolated target should use the interpolated value
+    pkg_interpolated = config.packages["package.with.interpolated.target"]
+    assert pkg_interpolated["target"] == "documentation"
+    # BUG: This will also fail for the same reason
+    assert pkg_interpolated["path"] == "documentation/package.with.interpolated.target"