diff --git a/wot-dijkstra/src/test/kotlin/org/pgpainless/wot/dijkstra/NetworkDSL.kt b/wot-dijkstra/src/test/kotlin/org/pgpainless/wot/dijkstra/NetworkDSL.kt
index 57250b1d..4b36bc35 100644
--- a/wot-dijkstra/src/test/kotlin/org/pgpainless/wot/dijkstra/NetworkDSL.kt
+++ b/wot-dijkstra/src/test/kotlin/org/pgpainless/wot/dijkstra/NetworkDSL.kt
@@ -40,6 +40,9 @@ interface NetworkDSL {
     fun Certification(issuer: CertSynopsis, target: CertSynopsis, userId: String): Certification =
             Certification(issuer, target, userId, Date())
 
+    fun Certification(issuer: CertSynopsis, target: CertSynopsis, amount: Int, depth: Depth): Certification =
+            Certification(issuer, target, null, Date(), null, true, amount, depth, RegexSet.wildcard())
+
     /**
      * Add a single [CertSynopsis] built from a [String] fingerprint to the builder.
      */
@@ -150,6 +153,30 @@ interface NetworkDSL {
         return getEdgeFor(Fingerprint(issuer), Fingerprint(target), userId)
     }
 
+    fun Date.plusMillis(millis: Long): Date {
+        return Date(time + millis)
+    }
+
+    fun Date.plusSeconds(seconds: Long): Date {
+        return plusMillis(1000L * seconds)
+    }
+
+    fun Date.plusMinutes(minutes: Long): Date {
+        return plusSeconds(60 * minutes)
+    }
+
+    fun Date.plusHours(hours: Long): Date {
+        return plusMinutes(60 * hours)
+    }
+
+    fun Date.plusDays(days: Long): Date {
+        return plusHours(24 * days)
+    }
+
+    fun domainRegex(domain: String): RegexSet {
+        return RegexSet.fromExpression("<[^>]+[@.]" + domain.replace(".", "\\.") + ">$")
+    }
+
     /**
      * Lambda with Receiver.
      *
diff --git a/wot-dijkstra/src/test/kotlin/org/pgpainless/wot/dijkstra/PathTest.kt b/wot-dijkstra/src/test/kotlin/org/pgpainless/wot/dijkstra/PathTest.kt
index 792b2067..e32f5574 100644
--- a/wot-dijkstra/src/test/kotlin/org/pgpainless/wot/dijkstra/PathTest.kt
+++ b/wot-dijkstra/src/test/kotlin/org/pgpainless/wot/dijkstra/PathTest.kt
@@ -7,23 +7,11 @@ import java.util.*
 import kotlin.test.assertEquals
 import kotlin.test.assertTrue
 
-class PathTest {
+class PathTest: NetworkDSL {
 
-    private val root = CertSynopsis(
-            Fingerprint("aabbccddeeAABBCCDDEEaabbccddeeAABBCCDDEE"),
-            null,
-            RevocationState.notRevoked(),
-            mapOf())
-    private val alice = CertSynopsis(
-            Fingerprint("0000000000000000000000000000000000000000"),
-            null,
-            RevocationState.notRevoked(),
-            mapOf())
-    private val bob = CertSynopsis(
-            Fingerprint("1111111111111111111111111111111111111111"),
-            null,
-            RevocationState.notRevoked(),
-            mapOf())
+    private val root = CertSynopsis("aabbccddeeAABBCCDDEEaabbccddeeAABBCCDDEE")
+    private val alice = CertSynopsis("0000000000000000000000000000000000000000")
+    private val bob = CertSynopsis("1111111111111111111111111111111111111111")
 
     // Root -(255, 255)-> Alice
     private val root_alice__fully_trusted = Certification(root, alice, 255, Depth.unconstrained())
@@ -32,7 +20,7 @@ class PathTest {
     // Alice -(255,255)-> Root
     private val alice_root = Certification(alice, root, 255, Depth.unconstrained())
     // Alice -(120, 1)-> Bob
-    private val alice_bob = Certification(alice, bob, null, Date())
+    private val alice_bob = Certification(alice, bob)
     // Root -> Root
     private val root_root = Certification(root, root, 120, Depth.limited(1))
 
@@ -102,10 +90,4 @@ class PathTest {
         val path = Path(root)
         assertThrows<IllegalArgumentException> { path.append(root_root) }
     }
-
-    /**
-     * Factory method for legible initialization of [Certification] objects for test purposes.
-     */
-    fun Certification(issuer: CertSynopsis, target: CertSynopsis, amount: Int, depth: Depth): Certification =
-            Certification(issuer, target, null, Date(), null, true, amount, depth, RegexSet.wildcard())
 }
\ No newline at end of file
diff --git a/wot-dijkstra/src/test/kotlin/org/pgpainless/wot/dijkstra/PathsTest.kt b/wot-dijkstra/src/test/kotlin/org/pgpainless/wot/dijkstra/PathsTest.kt
index 6174263a..067aa066 100644
--- a/wot-dijkstra/src/test/kotlin/org/pgpainless/wot/dijkstra/PathsTest.kt
+++ b/wot-dijkstra/src/test/kotlin/org/pgpainless/wot/dijkstra/PathsTest.kt
@@ -6,18 +6,10 @@ import org.pgpainless.wot.dijkstra.sq.*
 import java.util.*
 import kotlin.test.assertEquals
 
-class PathsTest {
+class PathsTest: NetworkDSL {
 
-    private val alice = CertSynopsis(
-            Fingerprint("0000000000000000000000000000000000000000"),
-            null,
-            RevocationState.notRevoked(),
-            mapOf())
-    private val bob = CertSynopsis(
-            Fingerprint("1111111111111111111111111111111111111111"),
-            null,
-            RevocationState.notRevoked(),
-            mapOf())
+    private val alice = CertSynopsis("0000000000000000000000000000000000000000")
+    private val bob = CertSynopsis("1111111111111111111111111111111111111111")
 
     private val alice_bob_1 = Certification(alice, bob, 140, Depth.unconstrained())
     private val alice_bob_2 = Certification(alice, bob, 160, Depth.limited(1))
@@ -56,10 +48,4 @@ class PathsTest {
             paths.add(path, 250)
         }
     }
-
-    /**
-     * Factory method to create a [Certification] more easily for test purposes.
-     */
-    private fun Certification(issuer: CertSynopsis, target: CertSynopsis, amount: Int, depth: Depth): Certification =
-            Certification(issuer, target, null, Date(), null, true, amount, depth, RegexSet.wildcard())
 }
\ No newline at end of file
diff --git a/wot-dijkstra/src/test/kotlin/org/pgpainless/wot/dijkstra/RegexSetTest.kt b/wot-dijkstra/src/test/kotlin/org/pgpainless/wot/dijkstra/RegexSetTest.kt
index 4bc4c59a..0b133224 100644
--- a/wot-dijkstra/src/test/kotlin/org/pgpainless/wot/dijkstra/RegexSetTest.kt
+++ b/wot-dijkstra/src/test/kotlin/org/pgpainless/wot/dijkstra/RegexSetTest.kt
@@ -5,7 +5,7 @@ import org.pgpainless.wot.dijkstra.sq.RegexSet
 import kotlin.test.assertFalse
 import kotlin.test.assertTrue
 
-class RegexSetTest {
+class RegexSetTest: NetworkDSL {
 
     private val exampleComRegex = "<[^>]+[@.]example\\.com>\$"
     private val pgpainlessOrgRegex = "<[^>]+[@.]pgpainless\\.org>\$"
@@ -39,4 +39,11 @@ class RegexSetTest {
         assertFalse { multi.matches("Alice") }
         assertFalse { multi.matches("<info@examp1e.com>") }
     }
+
+    @Test
+    fun `verify that a domain regex built with DLS properly works`() {
+        val regex = domainRegex("pgpainless.org")
+        assertTrue { regex.matches("Alice <alice@pgpainless.org>") }
+        assertFalse { regex.matches("<alice@pgpainless\\.org>") }
+    }
 }
\ No newline at end of file