From 59c007d6a4c8276876ecd4fa26003c7187ce4609 Mon Sep 17 00:00:00 2001
From: eugene yokota <eed3si9n@gmail.com>
Date: Thu, 7 May 2026 11:23:22 -0400
Subject: [PATCH] [2.x] test: Add move-file test (#9197)

**Problem**
Moving files around seems to break compile task.
---
 .../source-dependencies/move-file/A.scala       |  5 +++++
 .../source-dependencies/move-file/build.sbt     | 15 +++++++++++++++
 .../source-dependencies/move-file/pending       | 17 +++++++++++++++++
 3 files changed, 37 insertions(+)
 create mode 100644 sbt-app/src/sbt-test/source-dependencies/move-file/A.scala
 create mode 100644 sbt-app/src/sbt-test/source-dependencies/move-file/build.sbt
 create mode 100644 sbt-app/src/sbt-test/source-dependencies/move-file/pending

diff --git a/sbt-app/src/sbt-test/source-dependencies/move-file/A.scala b/sbt-app/src/sbt-test/source-dependencies/move-file/A.scala
new file mode 100644
index 000000000..83b986f33
--- /dev/null
+++ b/sbt-app/src/sbt-test/source-dependencies/move-file/A.scala
@@ -0,0 +1,5 @@
+package example
+
+object Main {
+  def main(args: Array[String]): Unit = ()
+}
diff --git a/sbt-app/src/sbt-test/source-dependencies/move-file/build.sbt b/sbt-app/src/sbt-test/source-dependencies/move-file/build.sbt
new file mode 100644
index 000000000..f62cfa56f
--- /dev/null
+++ b/sbt-app/src/sbt-test/source-dependencies/move-file/build.sbt
@@ -0,0 +1,15 @@
+import sbt.internal.inc.Analysis
+import complete.DefaultParsers.*
+
+scalaVersion := "2.13.18"
+
+val checkStampSize = inputKey[Unit]("Verifies the accumulated number of iterations of incremental compilation.")
+checkStampSize := {
+  val expected: Int = (Space ~> NatBasic).parsed
+  val analysis = (Compile / compile).value match
+    case a: Analysis => a
+  println(s"analysis: $analysis")
+  val sourceStampSize = analysis.readStamps.getAllSourceStamps.size
+  assert(sourceStampSize == expected, s"sourceStampSize = $sourceStampSize")
+}
+
diff --git a/sbt-app/src/sbt-test/source-dependencies/move-file/pending b/sbt-app/src/sbt-test/source-dependencies/move-file/pending
new file mode 100644
index 000000000..358ab6596
--- /dev/null
+++ b/sbt-app/src/sbt-test/source-dependencies/move-file/pending
@@ -0,0 +1,17 @@
+> checkStampSize 1
+
+# move A.scala elsewhere
+$ copy-file A.scala A.txt
+$ delete A.scala
+> checkStampSize 0
+
+# move A.scala back
+$ copy-file A.txt A.scala
+$ delete A.txt
+$ exists A.scala
+
+> show Compile/sources
+
+# if we recompile, we should regain stamp size 1
+> debug
+> checkStampSize 1