Fix tests to use correct fixtures for configuring (Apex)BootJars.

This is in preparation to r.android.com/1740313 where setting correct
variables would be enforced (i.e. apex and non-apex boot jars must be in
config.ApexBootJars and config.BootJars correspondingly).

Bug: 191369843
Test: m nothing
Change-Id: Ic86680c1f7af53d229083b2cc58beb3ceccb4b6a
diff --git a/dexpreopt/testing.go b/dexpreopt/testing.go
index 2f99655..8f5c315 100644
--- a/dexpreopt/testing.go
+++ b/dexpreopt/testing.go
@@ -125,6 +125,20 @@
 	})
 }
 
+// FixtureSetSystemServerJars sets the SystemServerJars property.
+func FixtureSetSystemServerJars(jars ...string) android.FixturePreparer {
+	return FixtureModifyGlobalConfig(func(dexpreoptConfig *GlobalConfig) {
+		dexpreoptConfig.SystemServerJars = android.CreateTestConfiguredJarList(jars)
+	})
+}
+
+// FixtureSetApexSystemServerJars sets the ApexSystemServerJars property in the global config.
+func FixtureSetApexSystemServerJars(jars ...string) android.FixturePreparer {
+	return FixtureModifyGlobalConfig(func(dexpreoptConfig *GlobalConfig) {
+		dexpreoptConfig.ApexSystemServerJars = android.CreateTestConfiguredJarList(jars)
+	})
+}
+
 // FixtureSetPreoptWithUpdatableBcp sets the PreoptWithUpdatableBcp property in the global config.
 func FixtureSetPreoptWithUpdatableBcp(value bool) android.FixturePreparer {
 	return FixtureModifyGlobalConfig(func(dexpreoptConfig *GlobalConfig) {