1 files changed, 73 insertions, 0 deletions
diff --git a/main/test/src/define/BasePathTests.scala b/main/test/src/define/BasePathTests.scala
new file mode 100644
index 00000000..b8a653c8
--- /dev/null
+++ b/main/test/src/define/BasePathTests.scala
@@ -0,0 +1,73 @@
+package mill.define
+
+import mill.util.{TestGraphs, TestUtil}
+import utest._
+import mill.{Module, T}
+object BasePathTests extends TestSuite{
+  val testGraphs = new TestGraphs
+  val tests = Tests{
+    def check[T <: Module](m: T)(f: T => Module, segments: String*) = {
+      val remaining = f(m).millSourcePath.relativeTo(m.millSourcePath).segments
+      assert(remaining == segments)
+    }
+    'singleton - {
+      check(testGraphs.singleton)(identity)
+    }
+    'backtickIdentifiers - {
+      check(testGraphs.bactickIdentifiers)(
+        _.`nested-module`,
+        "nested-module"
+      )
+    }
+    'separateGroups - {
+      check(TestGraphs.triangleTask)(identity)
+    }
+    'TraitWithModuleObject - {
+      check(TestGraphs.TraitWithModuleObject)(
+        _.TraitModule,
+       "TraitModule"
+      )
+    }
+    'nestedModuleNested - {
+      check(TestGraphs.nestedModule)(_.nested, "nested")
+    }
+    'nestedModuleInstance - {
+      check(TestGraphs.nestedModule)(_.classInstance, "classInstance")
+    }
+    'singleCross - {
+      check(TestGraphs.singleCross)(_.cross, "cross")
+      check(TestGraphs.singleCross)(_.cross("210"), "cross", "210")
+      check(TestGraphs.singleCross)(_.cross("211"), "cross", "211")
+    }
+    'doubleCross - {
+      check(TestGraphs.doubleCross)(_.cross, "cross")
+      check(TestGraphs.doubleCross)(_.cross("210", "jvm"), "cross", "210", "jvm")
+      check(TestGraphs.doubleCross)(_.cross("212", "js"), "cross", "212", "js")
+    }
+    'nestedCrosses - {
+      check(TestGraphs.nestedCrosses)(_.cross, "cross")
+      check(TestGraphs.nestedCrosses)(
+        _.cross("210").cross2("js"),
+        "cross", "210", "cross2", "js"
+      )
+    }
+    'overriden - {
+      object overridenBasePath extends TestUtil.BaseModule {
+        override def millSourcePath = os.pwd / 'overridenBasePathRootValue
+        object nested extends Module{
+          override def millSourcePath = super.millSourcePath / 'overridenBasePathNested
+          object nested extends Module{
+            override def millSourcePath = super.millSourcePath / 'overridenBasePathDoubleNested
+          }
+        }
+      }
+      assert(
+        overridenBasePath.millSourcePath == os.pwd / 'overridenBasePathRootValue,
+        overridenBasePath.nested.millSourcePath == os.pwd / 'overridenBasePathRootValue / 'nested / 'overridenBasePathNested,
+        overridenBasePath.nested.nested.millSourcePath == os.pwd / 'overridenBasePathRootValue / 'nested / 'overridenBasePathNested / 'nested / 'overridenBasePathDoubleNested
+      )
+    }
+
+  }
+}
+