diff --git a/lib/mutant/integration/minitest.rb b/lib/mutant/integration/minitest.rb
index bdd0076db..e957d41c0 100644
--- a/lib/mutant/integration/minitest.rb
+++ b/lib/mutant/integration/minitest.rb
@@ -124,8 +124,8 @@ def all_tests_index
 
       def construct_test(test_case)
         Test.new(
-          id:         test_case.identification,
-          expression: config.expression_parser.apply(test_case.expression_syntax).from_right
+          id:          test_case.identification,
+          expressions: [config.expression_parser.apply(test_case.expression_syntax).from_right]
         )
       end
 
diff --git a/lib/mutant/integration/rspec.rb b/lib/mutant/integration/rspec.rb
index d7377daf9..098c6c017 100644
--- a/lib/mutant/integration/rspec.rb
+++ b/lib/mutant/integration/rspec.rb
@@ -97,8 +97,8 @@ def parse_example(example, index)
         }
 
         Test.new(
-          expression: parse_metadata(metadata),
-          id:         id
+          expressions: [parse_metadata(metadata)],
+          id:          id
         )
       end
 
diff --git a/lib/mutant/selector/expression.rb b/lib/mutant/selector/expression.rb
index 8392e3a30..f30295613 100644
--- a/lib/mutant/selector/expression.rb
+++ b/lib/mutant/selector/expression.rb
@@ -14,7 +14,9 @@ class Expression < self
       def call(subject)
         subject.match_expressions.each do |match_expression|
           subject_tests = integration.all_tests.select do |test|
-            match_expression.prefix?(test.expression)
+            test.expressions.any? do |test_expression|
+              match_expression.prefix?(test_expression)
+            end
           end
           return subject_tests if subject_tests.any?
         end
diff --git a/lib/mutant/test.rb b/lib/mutant/test.rb
index 39626392a..d045d22db 100644
--- a/lib/mutant/test.rb
+++ b/lib/mutant/test.rb
@@ -4,7 +4,7 @@ module Mutant
   # Abstract base class for test that might kill a mutation
   class Test
     include Adamantium::Flat, Anima.new(
-      :expression,
+      :expressions,
       :id
     )
 
diff --git a/spec/unit/mutant/integration/rspec_spec.rb b/spec/unit/mutant/integration/rspec_spec.rb
index 70e4ad2c3..1e6e59943 100644
--- a/spec/unit/mutant/integration/rspec_spec.rb
+++ b/spec/unit/mutant/integration/rspec_spec.rb
@@ -98,20 +98,20 @@
   let(:all_tests) do
     [
       Mutant::Test.new(
-        id:         'rspec:0:example-a-location/example-a-full-description',
-        expression: parse_expression('*')
+        id:          'rspec:0:example-a-location/example-a-full-description',
+        expressions: [parse_expression('*')]
       ),
       Mutant::Test.new(
-        id:         'rspec:1:example-c-location/Example::C blah',
-        expression: parse_expression('Example::C')
+        id:          'rspec:1:example-c-location/Example::C blah',
+        expressions: [parse_expression('Example::C')]
       ),
       Mutant::Test.new(
-        id:         "rspec:2:example-d-location/Example::D\nblah",
-        expression: parse_expression('*')
+        id:          "rspec:2:example-d-location/Example::D\nblah",
+        expressions: [parse_expression('*')]
       ),
       Mutant::Test.new(
-        id:         'rspec:3:example-e-location/Example::E',
-        expression: parse_expression('Foo')
+        id:          'rspec:3:example-e-location/Example::E',
+        expressions: [parse_expression('Foo')]
       )
     ]
   end
diff --git a/spec/unit/mutant/selector/expression_spec.rb b/spec/unit/mutant/selector/expression_spec.rb
index ce4fb4992..8d2f74e7f 100644
--- a/spec/unit/mutant/selector/expression_spec.rb
+++ b/spec/unit/mutant/selector/expression_spec.rb
@@ -4,14 +4,34 @@
   describe '#call' do
     let(:object) { described_class.new(integration) }
 
-    let(:mutation_subject) { subject_class.new(context: context, node: node, warnings: warnings)     }
-    let(:context)          { instance_double(Mutant::Context)                                        }
-    let(:node)             { instance_double(Parser::AST::Node)                                      }
-    let(:integration)      { instance_double(Mutant::Integration, all_tests: all_tests)              }
-    let(:test_a)           { instance_double(Mutant::Test, expression: parse_expression('SubjectA')) }
-    let(:test_b)           { instance_double(Mutant::Test, expression: parse_expression('SubjectB')) }
-    let(:test_c)           { instance_double(Mutant::Test, expression: parse_expression('SubjectC')) }
-    let(:warnings)         { instance_double(Mutant::Warnings)                                       }
+    let(:context)  { instance_double(Mutant::Context)   }
+    let(:node)     { instance_double(Parser::AST::Node) }
+    let(:test_a)   { mk_test('SubjectA')                }
+    let(:test_b)   { mk_test('SubjectB')                }
+    let(:test_c)   { mk_test('SubjectC')                }
+    let(:warnings) { instance_double(Mutant::Warnings)  }
+
+    let(:integration) do
+      instance_double(
+        Mutant::Integration,
+        all_tests: all_tests
+      )
+    end
+
+    let(:mutation_subject) do
+      subject_class.new(
+        context:  context,
+        node:     node,
+        warnings: warnings
+      )
+    end
+
+    def mk_test(expression)
+      instance_double(
+        Mutant::Test,
+        expressions: [parse_expression(expression)]
+      )
+    end
 
     let(:subject_class) do
       parse = method(:parse_expression)