Add test covering replacer unfixing

tests/Composer/Test/DependencyResolver/Fixtures/poolbuilder/partial-update-transitive-deps-unfix.test

@@ -8,9 +8,9 @@ Partially updating one root requirement with transitive deps fully updates anoth
         "root/dep": "*"
     },
     "locked": [
-        {"name": "root/update", "version": "1.0.1", "require": {"dep/dep": "1.*"}, "id": 1},
-        {"name": "dep/dep", "version": "1.0.2", "require": {"root/dep": "1.*"}, "id": 2},
-        {"name": "root/dep", "version": "1.0.3", "id": 3}
+        {"name": "root/update", "version": "1.0.1", "require": {"dep/dep": "1.*"}},
+        {"name": "dep/dep", "version": "1.0.2", "require": {"root/dep": "1.*"}},
+        {"name": "root/dep", "version": "1.0.3"}
     ],
     "allowList": [
         "root/update"

tests/Composer/Test/DependencyResolver/Fixtures/poolbuilder/partial-update-unfixing-with-replacers.test

@@ -0,0 +1,50 @@
+--TEST--
+Fixed packages and replacers get unfixed correctly (refs https://github.com/composer/composer/pull/8942)
+
+--REQUEST--
+{
+    "require": {
+        "root/req1": "*",
+        "root/req3": "*"
+    },
+    "locked": [
+        {"name": "root/req1", "version": "1.0.0", "require": {"replacer/pkg": "1.*"}},
+        {"name": "root/req3", "version": "1.0.0", "require": {"replaced/pkg": "1.*", "dep/dep": "2.*"}},
+        {"name": "replacer/pkg", "version": "1.0.0", "replace": {"replaced/pkg": "*"}},
+        {"name": "dep/dep", "version": "2.3.5"}
+    ],
+    "allowList": [
+        "root/req1"
+    ],
+    "allowTransitiveDeps": true
+}
+
+--FIXED--
+[
+]
+
+--PACKAGES--
+[
+    {"name": "root/req1", "version": "1.0.0", "require": {"replacer/pkg": "1.*"}},
+    {"name": "root/req1", "version": "1.1.0", "require": {"replacer/pkg": "1.*"}},
+    {"name": "root/req3", "version": "1.0.0", "require": {"replaced/pkg": "1.*"}},
+    {"name": "root/req3", "version": "1.1.0", "require": {"replaced/pkg": "1.*"}},
+    {"name": "replacer/pkg", "version": "1.0.0", "replace": {"replaced/pkg": "*"}},
+    {"name": "replacer/pkg", "version": "1.1.0", "replace": {"replaced/pkg": "*"}},
+    {"name": "replaced/pkg", "version": "1.2.3"},
+    {"name": "replaced/pkg", "version": "1.2.4"},
+    {"name": "dep/dep", "version": "2.3.5"},
+    {"name": "dep/dep", "version": "2.3.6"}
+]
+
+--EXPECT--
+[
+    "root/req3-1.0.0.0 (locked)",
+    "dep/dep-2.3.5.0 (locked)",
+    "root/req1-1.0.0.0",
+    "root/req1-1.1.0.0",
+    "replacer/pkg-1.0.0.0",
+    "replacer/pkg-1.1.0.0",
+    "replaced/pkg-1.2.3.0",
+    "replaced/pkg-1.2.4.0"
+]

tests/Composer/Test/DependencyResolver/PoolBuilderTest.php

@@ -113,11 +113,16 @@ class PoolBuilderTest extends TestCase
                 return $id;
             }
 
+            $suffix = '';
+            if ($package->getRepository() instanceof LockArrayRepository) {
+                $suffix = ' (locked)';
+            }
+
             if ($package instanceof AliasPackage && $id = array_search($package->getAliasOf(), $packageIds, true)) {
-                return (string) $package->getName().'-'.$package->getVersion() .' alias of '.$id;
+                return (string) $package->getName().'-'.$package->getVersion() .' alias of '.$id . $suffix;
             }
 
-            return (string) $package;
+            return (string) $package . $suffix;
         }, $result);
 
         $this->assertSame($expect, $result);