diff --git a/src/test/scala/com/gu/tip/HttpClientTest.scala b/src/test/scala/com/gu/tip/HttpClientTest.scala
index 59cdb31..b337896 100644
--- a/src/test/scala/com/gu/tip/HttpClientTest.scala
+++ b/src/test/scala/com/gu/tip/HttpClientTest.scala
@@ -1,22 +1,22 @@
 package com.gu.tip
 
-import org.scalatest.FlatSpec
+import org.scalatest.{FlatSpec, MustMatchers}
 
-class HttpClientTest extends FlatSpec {
+class HttpClientTest extends FlatSpec with MustMatchers {
 
   behavior of "HttpClient"
 
   it should "be able to make a GET request" in {
     object HttpClient extends HttpClient
     val (code, body) = HttpClient.get("http://example.com", ("Authorization","test"))
-    assert(code == 200)
+    code mustBe 200
   }
 
   it should "be able to make a POST request" in {
     object HttpClient extends HttpClient
     val (code, body) =
       HttpClient.post("http://petstore.swagger.io/v2/pet", ("Authorization","test"), "{\"name\": \"doggie\"}")
-    assert(code == 200)
+    code mustBe 200
   }
 
 }
diff --git a/src/test/scala/com/gu/tip/NotifierTest.scala b/src/test/scala/com/gu/tip/NotifierTest.scala
index bfa7cc4..b32233d 100644
--- a/src/test/scala/com/gu/tip/NotifierTest.scala
+++ b/src/test/scala/com/gu/tip/NotifierTest.scala
@@ -1,8 +1,8 @@
 package com.gu.tip
 
-import org.scalatest.FlatSpec
+import org.scalatest.{FlatSpec, MustMatchers}
 
-class NotifierTest extends FlatSpec {
+class NotifierTest extends FlatSpec with MustMatchers {
 
   val mockCommitMessageResponse =
     """
@@ -27,7 +27,7 @@ class NotifierTest extends FlatSpec {
 
     object Notifier extends Notifier with GitHubApi with MockHttpClient
 
-    assert(Notifier.setLabelOnLatestMergedPr() != 200)
+    Notifier.setLabelOnLatestMergedPr() must not be 200
   }
 
   behavior of "happy Notifier"
@@ -43,6 +43,6 @@ class NotifierTest extends FlatSpec {
 
     object Notifier extends Notifier with GitHubApi with MockHttpClient
 
-    assert(Notifier.setLabelOnLatestMergedPr() == 200)
+    Notifier.setLabelOnLatestMergedPr() mustBe 200
   }
 }
diff --git a/src/test/scala/com/gu/tip/TipTest.scala b/src/test/scala/com/gu/tip/TipTest.scala
index 1b6ac22..0fee0dd 100644
--- a/src/test/scala/com/gu/tip/TipTest.scala
+++ b/src/test/scala/com/gu/tip/TipTest.scala
@@ -1,9 +1,8 @@
 package com.gu.tip
 
-import org.scalatest.{AsyncFlatSpec}
-import org.scalatest.Matchers._
+import org.scalatest.{AsyncFlatSpec, MustMatchers}
 
-class TipTest extends AsyncFlatSpec {
+class TipTest extends AsyncFlatSpec with MustMatchers {
   trait MockHttpClient extends HttpClient {
     override def get(endpoint: String = "", authHeader: (String, String) = ("", "")) = (200, "")
     override def post(endpoint: String = "", authHeader: (String, String) = ("", ""), jsonBody: String = "") = (200, "")
@@ -14,7 +13,7 @@ class TipTest extends AsyncFlatSpec {
   behavior of "unhappy Tip"
 
   it should "error on bad path name" in {
-    Tip.verify("badName").map { result => assert(result == UnrecognizedPathName) }
+    Tip.verify("badName").map(_ mustBe UnrecognizedPathName)
   }
 
   it should "error on bad syntax path definition" in {
@@ -22,14 +21,14 @@ class TipTest extends AsyncFlatSpec {
       override val pathConfigFilename: String = "tip-bad.yaml"
     }
 
-    Tip.verify("").map { result => assert(result == PathDefinitionSyntaxError) }
+    Tip.verify("").map( _ mustBe PathDefinitionSyntaxError)
   }
 
   it should "error on missing path definition file" in {
     object Tip extends Tip with Notifier with GitHubApi with MockHttpClient {
       override val pathConfigFilename: String = "tip-not-found.yaml"
     }
-    Tip.verify("").map { result => assert(result == PathDefinitionFileNotFound) }
+    Tip.verify("").map(_ mustBe PathDefinitionFileNotFound)
   }
 
   it should "error on unclassifed error"
@@ -44,20 +43,16 @@ class TipTest extends AsyncFlatSpec {
     for {
      _ <- Tip.verify("Name A")
      result <- Tip.verify("Name B")
-    } yield {
-      assert(result == FailedToSetLabel)
-    }
+    } yield result mustBe FailedToSetLabel
   }
 
   behavior of "happy Tip"
 
   it should "verify a path" in {
-    Tip.verify("Name A").map { result => assert(result == PathVerified) }
-
+    Tip.verify("Name A").map(_ mustBe PathVerified)
   }
 
   it should "set the label when all paths are verified" in {
-
     trait MockNotifier extends NotifierIf {this: GitHubApiIf =>
       override def setLabelOnLatestMergedPr(): Int = 200
     }
@@ -67,13 +62,10 @@ class TipTest extends AsyncFlatSpec {
     for {
       _ <- Tip.verify("Name A")
       result <- Tip.verify("Name B")
-    } yield {
-      assert(result == LabelSet)
-    }
+    } yield result mustBe LabelSet
   }
 
   it should "set the label only once" in {
-
     trait MockNotifier extends NotifierIf {this: GitHubApiIf =>
       override def setLabelOnLatestMergedPr(): Int = 200
     }
@@ -85,8 +77,6 @@ class TipTest extends AsyncFlatSpec {
       _ <- Tip.verify("Name B")
       _ <- Tip.verify("Name A")
       result <- Tip.verify("Name B")
-    } yield {
-      assert(result == LabelAlreadySet)
-    }
+    } yield result mustBe LabelAlreadySet
   }
 }
\ No newline at end of file
diff --git a/src/test/scala/com/gu/tip/YamlPathConfigReaderTest.scala b/src/test/scala/com/gu/tip/YamlPathConfigReaderTest.scala
index 97ef8bc..a86fca7 100644
--- a/src/test/scala/com/gu/tip/YamlPathConfigReaderTest.scala
+++ b/src/test/scala/com/gu/tip/YamlPathConfigReaderTest.scala
@@ -1,10 +1,9 @@
 import java.io.FileNotFoundException
 
-import org.scalatest.FlatSpec
-import org.scalatest.Matchers._
+import org.scalatest.{FlatSpec, Matchers}
 import com.gu.tip.{EnrichedPath, Path, Paths, YamlPathConfigReader}
 
-class YamlPathConfigReaderTest extends FlatSpec {
+class YamlPathConfigReaderTest extends FlatSpec with Matchers {
 
   "YamlPathConfigReader" should "convert tip.yaml definition to Paths type" in {
     YamlPathConfigReader("tip.yaml") shouldBe a [Paths]
@@ -39,7 +38,7 @@ class YamlPathConfigReaderTest extends FlatSpec {
     val enrichedPath = new EnrichedPath(Path("Path Name", "Path Description"))
     val paths = new Paths(Map("Path Name" -> enrichedPath))
     paths.verify("Path Name")
-    assert(paths.allVerified)
+    paths shouldBe 'allVerified
   }
 
   it should "verify a path only if it has not been verified before" in {
@@ -48,6 +47,6 @@ class YamlPathConfigReaderTest extends FlatSpec {
     val paths = new Paths(Map("Path Name A" -> enrichedPathA, "Path Name B" -> enrichedPathB))
     paths.verify("Path Name A")
     paths.verify("Path Name A")
-    assert(!paths.allVerified)
+    paths should not be 'allVerified
   }
 }
\ No newline at end of file