I wonder if Github CI will be happy with this one

test/smee/smee_entity_test.exs

@@ -608,13 +608,21 @@ defmodule SmeeEntityTest do
   end
 
   describe "Protocol String.Chars.to_string/1" do
-    assert "#[Entity https://indiid.net/idp/shibboleth]" = "#{@idp_entity}"
+
+    test "Entity is interpolated into a string in the correct format" do
+      assert "#[Entity https://indiid.net/idp/shibboleth]" = "#{@idp_entity}"
+    end
   end
 
   describe "Protocol Jason Encoder" do
-    assert "{\"compressed\":false,\"data\":\"<?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"" <> _ = Jason.encode!(
-      @idp_entity
-    )
+
+    test "entity is stored in a suitable JSON format" do
+      encoded_and_decoded = Jason.encode!(@idp_entity)
+                            |> Jason.decode!()
+
+      assert is_map(encoded_and_decoded)
+
+    end
   end
 
   describe "registration_authority/1" do

test/smee/smee_metadata_test.exs

@@ -878,11 +878,20 @@ defmodule SmeeMetadataTest do
   end
 
   describe "Protocol String.Chars.to_string/1" do
-    "#[Metadata file:test/support/static/aggregate.xml]" = "#{@valid_metadata}"
+
+    test "Metadata is converted into a suitable string" do
+      "#[Metadata file:test/support/static/aggregate.xml]" = "#{@valid_metadata}"
+    end
+
   end
 
   describe "Protocol Jason Encoder" do
-    "{\"compressed\":false,\"data\":\"" <> _ = Jason.encode!(@valid_metadata)
+
+    test "Metadata is serialised as JSON" do
+      encoded_and_decoded = Jason.encode!(@valid_metadata)
+                            |> Jason.decode!
+      assert is_map(encoded_and_decoded)
+    end
   end
 
 end

test/smee/smee_source_test.exs

@@ -236,13 +236,23 @@ defmodule SmeeSourceTest do
   end
 
   describe "Protocol String.Chars.to_string/1" do
-    source = Source.new("http://metadata.ukfederation.org.uk/ukfederation-metadata.xml")
-    "#[Source http://metadata.ukfederation.org.uk/ukfederation-metadata.xml]" = "#{source}"
+
+    test "Source is converted into a suitable string" do
+      source = Source.new("http://metadata.ukfederation.org.uk/ukfederation-metadata.xml")
+      "#[Source http://metadata.ukfederation.org.uk/ukfederation-metadata.xml]" = "#{source}"
+    end
   end
 
   describe "Protocol Jason Encoder" do
-    source = Source.new("http://metadata.ukfederation.org.uk/ukfederation-metadata.xml")
-    "{\"id\":null,\"label\":null,\"priority\":5,\"type\":\"aggregate\"" <> _ = Jason.encode!(source)
+
+    test "Source is serialised into JSON" do
+
+      source = Source.new("http://metadata.ukfederation.org.uk/ukfederation-metadata.xml")
+      encoded_and_decoded = Jason.encode!(source)
+                            |> Jason.decode!
+      assert is_map(encoded_and_decoded)
+
+    end
   end
 
 end