diff --git a/Tests/XCRemoteCacheTests/Commands/Plugins/Thinning/ThinningCreatorPluginTests.swift b/Tests/XCRemoteCacheTests/Commands/Plugins/Thinning/ThinningCreatorPluginTests.swift
index 6f49fea..4be637b 100644
--- a/Tests/XCRemoteCacheTests/Commands/Plugins/Thinning/ThinningCreatorPluginTests.swift
+++ b/Tests/XCRemoteCacheTests/Commands/Plugins/Thinning/ThinningCreatorPluginTests.swift
@@ -76,4 +76,62 @@ class ThinningCreatorPluginTests: FileXCTestCase {
 
         XCTAssertThrowsError(try plugin.extraMetaKeys(Self.sampleMeta))
     }
+
+    func testDefinesExtraMetaKeysForTargetsThatReusedArtifact() throws {
+        let otherTargetTempDir = targetTempDirRoot.appendingPathComponent("Other.build")
+        let marker = otherTargetTempDir.appendingPathComponent("rc.enabled")
+        let reusedArtifact = otherTargetTempDir
+            .appendingPathComponent("xccache")
+            .appendingPathComponent("123")
+            .appendingPathExtension("zip")
+        try fileManager.spt_createEmptyFile(marker)
+        try fileManager.spt_createEmptyFile(reusedArtifact)
+
+        let extraKeys = try plugin.extraMetaKeys(Self.sampleMeta)
+
+        XCTAssertEqual(extraKeys, ["thinning_Other": "123"])
+    }
+
+    func testFailsGeneratingExtraMetaKeysForTwoArtifactsInTargetTempDir() throws {
+        let otherTargetTempDir = targetTempDirRoot.appendingPathComponent("Other.build")
+        let marker = otherTargetTempDir.appendingPathComponent("rc.enabled")
+        let reusedArtifact1 = otherTargetTempDir
+            .appendingPathComponent("xccache")
+            .appendingPathComponent("001")
+            .appendingPathExtension("zip")
+        let reusedArtifact2 = otherTargetTempDir
+            .appendingPathComponent("xccache")
+            .appendingPathComponent("002")
+            .appendingPathExtension("zip")
+        try fileManager.spt_createEmptyFile(marker)
+        try fileManager.spt_createEmptyFile(reusedArtifact1)
+        try fileManager.spt_createEmptyFile(reusedArtifact2)
+
+        XCTAssertThrowsError(try plugin.extraMetaKeys(Self.sampleMeta))
+    }
+
+    func testDefinesExtraMetaKeysForGeneratedAndReusedArtifact() throws {
+        let otherTargetTempDir = targetTempDirRoot.appendingPathComponent("Generated.build")
+        let generatedArtifact = otherTargetTempDir
+            .appendingPathComponent("xccache")
+            .appendingPathComponent("produced")
+            .appendingPathComponent("000")
+            .appendingPathExtension("zip")
+        try fileManager.spt_createEmptyFile(generatedArtifact)
+        let reusedTargetTempDir = targetTempDirRoot.appendingPathComponent("Reused.build")
+        let marker = reusedTargetTempDir.appendingPathComponent("rc.enabled")
+        let reusedArtifact = reusedTargetTempDir
+            .appendingPathComponent("xccache")
+            .appendingPathComponent("999")
+            .appendingPathExtension("zip")
+        try fileManager.spt_createEmptyFile(marker)
+        try fileManager.spt_createEmptyFile(reusedArtifact)
+
+        let extraKeys = try plugin.extraMetaKeys(Self.sampleMeta)
+
+        XCTAssertEqual(extraKeys, [
+            "thinning_Generated": "000",
+            "thinning_Reused": "999"
+        ])
+    }
 }