Update lock syntax in tests and verify installed version does not impact lock generation

Particularly the test

tests/Composer/Test/Fixtures/installer/partial-update-downgrades-non-whitelisted-unstable.test

is interesting because it verifies that an older version will be
installed on update if the new one is only present in the installed repo
or vendor dir. This was the cause of a lot of weird edge cases and
unreliable update behavior in Composer v1

tests/Composer/Test/Fixtures/installer/install-missing-alias-from-lock.test

@@ -29,7 +29,7 @@ Installing an old alias that doesn't exist anymore from a lock is possible
             "type": "library"
         }
     ],
-    "packages-dev": null,
+    "packages-dev": [],
     "aliases": [],
     "minimum-stability": "dev",
     "stability-flags": [],

tests/Composer/Test/Fixtures/installer/partial-update-downgrades-non-whitelisted-unstable.test

@@ -53,7 +53,7 @@ update c/uptodate
     "packages": [
         { "name": "a/old", "version": "1.0.0", "type": "library" },
         { "name": "b/unstable", "version": "1.0.0", "type": "library" },
-        { "name": "c/uptodate", "version": "2.0.0", "type": "library" },
+        { "name": "c/uptodate", "version": "1.0.0", "type": "library" },
         { "name": "d/removed", "version": "1.0.0", "type": "library" }
     ],
     "packages-dev": [],
@@ -66,6 +66,7 @@ update c/uptodate
     "platform-dev": []
 }
 --EXPECT--
-Updating b/unstable (1.1.0-alpha) to b/unstable (1.0.0)
 Updating a/old (0.9.0) to a/old (1.0.0)
+Updating b/unstable (1.1.0-alpha) to b/unstable (1.0.0)
+Updating c/uptodate (2.0.0) to c/uptodate (1.0.0)
 Installing d/removed (1.0.0)

tests/Composer/Test/Fixtures/installer/update-whitelist-patterns.test

@@ -39,10 +39,31 @@ Update with a package whitelist only updates those corresponding to the pattern
     { "name": "another/another", "version": "1.0" },
     { "name": "no/regexp", "version": "1.0" }
 ]
+--LOCK--
+{
+    "packages": [
+        { "name": "vendor/Test-Package", "version": "1.0" },
+        { "name": "vendor/NotMe", "version": "1.0" },
+        { "name": "exact/Test-Package", "version": "1.0" },
+        { "name": "notexact/TestPackage", "version": "1.0" },
+        { "name": "all/Package1", "version": "1.0" },
+        { "name": "all/Package2", "version": "1.0" },
+        { "name": "another/another", "version": "1.0" },
+        { "name": "no/regexp", "version": "1.0" }
+    ],
+    "packages-dev": [],
+    "aliases": [],
+    "minimum-stability": "dev",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": [],
+    "platform-dev": []
+}
 --RUN--
 update vendor/Test* exact/Test-Package notexact/Test all/* no/reg?xp
 --EXPECT--
-Updating vendor/Test-Package (1.0) to vendor/Test-Package (2.0)
-Updating exact/Test-Package (1.0) to exact/Test-Package (2.0)
 Updating all/Package1 (1.0) to all/Package1 (2.0)
 Updating all/Package2 (1.0) to all/Package2 (2.0)
+Updating exact/Test-Package (1.0) to exact/Test-Package (2.0)
+Updating vendor/Test-Package (1.0) to vendor/Test-Package (2.0)

tests/Composer/Test/Fixtures/installer/update-whitelist-reads-lock.test

@@ -28,7 +28,7 @@ Limited update takes rules from lock if available, and not from the installed re
         { "name": "toupdate/installed", "version": "1.0.0" },
         { "name": "toupdate/notinstalled", "version": "1.0.0" }
     ],
-    "packages-dev": null,
+    "packages-dev": [],
     "aliases": [],
     "minimum-stability": "stable",
     "stability-flags": [],
@@ -43,6 +43,6 @@ Limited update takes rules from lock if available, and not from the installed re
 --RUN--
 update toupdate/installed
 --EXPECT--
-Updating toupdate/installed (1.0.0) to toupdate/installed (1.1.0)
 Updating old/installed (0.9.0) to old/installed (1.0.0)
+Updating toupdate/installed (1.0.0) to toupdate/installed (1.1.0)
 Installing toupdate/notinstalled (1.0.0)