diff --git a/spec/expectations/block_expectation_partial_spec.cr b/spec/expectations/block_expectation_partial_spec.cr
new file mode 100644
index 0000000..e30dca2
--- /dev/null
+++ b/spec/expectations/block_expectation_partial_spec.cr
@@ -0,0 +1,150 @@
+require "../spec_helper"
+
+describe Spectator::Expectations::BlockExpectationPartial do
+  describe "#actual" do
+    context "with a label" do
+      it "contains the value passed to the constructor" do
+        actual = ->{ 777 }
+        partial = Spectator::Expectations::BlockExpectationPartial.new(actual.to_s, actual)
+        partial.actual.should eq(actual.call)
+      end
+    end
+
+    context "without a label" do
+      it "contains the value passed to the constructor" do
+        actual = ->{ 777 }
+        partial = Spectator::Expectations::BlockExpectationPartial.new(actual)
+        partial.actual.should eq(actual.call)
+      end
+    end
+  end
+
+  describe "#label" do
+    context "when provided" do
+      it "contains the value passed to the constructor" do
+        actual = ->{ 777 }
+        label = "lucky"
+        partial = Spectator::Expectations::BlockExpectationPartial.new(label, actual)
+        partial.label.should eq(label)
+      end
+    end
+
+    context "when omitted" do
+      it "contains a stringified version of #actual" do
+        actual = ->{ 777 }
+        partial = Spectator::Expectations::BlockExpectationPartial.new(actual)
+        partial.label.should eq(actual.to_s)
+      end
+    end
+  end
+
+  describe "#to" do
+    it "reports an expectation" do
+      spy = SpyExample.create do
+        actual = ->{ 777 }
+        expected = 777
+        partial = Spectator::Expectations::BlockExpectationPartial.new(actual)
+        matcher = Spectator::Matchers::EqualityMatcher.new(expected)
+        partial.to(matcher)
+      end
+      Spectator::Internals::Harness.run(spy)
+      spy.harness.expectations.size.should eq(1)
+    end
+
+    it "reports multiple expectations" do
+      spy = SpyExample.create do
+        actual = ->{ 777 }
+        expected = 777
+        partial = Spectator::Expectations::BlockExpectationPartial.new(actual)
+        matcher = Spectator::Matchers::EqualityMatcher.new(expected)
+        5.times { partial.to(matcher) }
+      end
+      Spectator::Internals::Harness.run(spy)
+      spy.harness.expectations.size.should eq(5)
+    end
+
+    context "with a met condition" do
+      it "reports a satisifed expectation" do
+        spy = SpyExample.create do
+          actual = ->{ 777 }
+          expected = 777
+          partial = Spectator::Expectations::BlockExpectationPartial.new(actual)
+          matcher = Spectator::Matchers::EqualityMatcher.new(expected)
+          partial.to(matcher)
+        end
+        Spectator::Internals::Harness.run(spy)
+        spy.harness.expectations.first.satisfied?.should be_true
+      end
+    end
+
+    context "with an unmet condition" do
+      it "reports an unsatisfied expectation" do
+        spy = SpyExample.create do
+          actual = ->{ 777 }
+          expected = 42
+          partial = Spectator::Expectations::BlockExpectationPartial.new(actual)
+          matcher = Spectator::Matchers::EqualityMatcher.new(expected)
+          partial.to(matcher)
+        end
+        Spectator::Internals::Harness.run(spy)
+        spy.harness.expectations.first.satisfied?.should be_false
+      end
+    end
+  end
+
+  {% for method in %i[to_not not_to] %}
+    describe "#" + {{method.id.stringify}} do
+      it "reports an expectation" do
+        spy = SpyExample.create do
+          actual = ->{ 777 }
+          expected = 777
+          partial = Spectator::Expectations::BlockExpectationPartial.new(actual)
+          matcher = Spectator::Matchers::EqualityMatcher.new(expected)
+          partial.{{method.id}}(matcher)
+        end
+        Spectator::Internals::Harness.run(spy)
+        spy.harness.expectations.size.should eq(1)
+      end
+
+      it "reports multiple expectations" do
+        spy = SpyExample.create do
+          actual = ->{ 777 }
+          expected = 42
+          partial = Spectator::Expectations::BlockExpectationPartial.new(actual)
+          matcher = Spectator::Matchers::EqualityMatcher.new(expected)
+          5.times { partial.{{method.id}}(matcher) }
+        end
+        Spectator::Internals::Harness.run(spy)
+        spy.harness.expectations.size.should eq(5)
+      end
+
+      context "with a met condition" do
+        it "reports an unsatisifed expectation" do
+          spy = SpyExample.create do
+            actual = ->{ 777 }
+            expected = 777
+            partial = Spectator::Expectations::BlockExpectationPartial.new(actual)
+            matcher = Spectator::Matchers::EqualityMatcher.new(expected)
+            partial.{{method.id}}(matcher)
+          end
+          Spectator::Internals::Harness.run(spy)
+          spy.harness.expectations.first.satisfied?.should be_false
+        end
+      end
+
+      context "with an unmet condition" do
+        it "reports an satisfied expectation" do
+          spy = SpyExample.create do
+            actual = ->{ 777 }
+            expected = 42
+            partial = Spectator::Expectations::BlockExpectationPartial.new(actual)
+            matcher = Spectator::Matchers::EqualityMatcher.new(expected)
+            partial.{{method.id}}(matcher)
+          end
+          Spectator::Internals::Harness.run(spy)
+          spy.harness.expectations.first.satisfied?.should be_true
+        end
+      end
+    end
+  {% end %}
+end
diff --git a/spec/expectations/block_expectation_spec.cr b/spec/expectations/block_expectation_spec.cr
new file mode 100644
index 0000000..e509d4c
--- /dev/null
+++ b/spec/expectations/block_expectation_spec.cr
@@ -0,0 +1,159 @@
+require "../spec_helper"
+
+describe Spectator::Expectations::BlockExpectation do
+  describe "#satisifed?" do
+    context "with a successful match" do
+      it "is true" do
+        value = 42
+        block = ->{ value }
+        partial = Spectator::Expectations::BlockExpectationPartial.new(block.to_s, block)
+        matcher = Spectator::Matchers::EqualityMatcher.new(value.to_s, value)
+        expectation = Spectator::Expectations::BlockExpectation.new(true, false, partial, matcher)
+        matcher.match?(partial).should be_true # Sanity check.
+        expectation.satisfied?.should be_true
+      end
+
+      context "when negated" do
+        it "is false" do
+          value = 42
+          block = ->{ value }
+          partial = Spectator::Expectations::BlockExpectationPartial.new(block.to_s, block)
+          matcher = Spectator::Matchers::EqualityMatcher.new(value.to_s, value)
+          expectation = Spectator::Expectations::BlockExpectation.new(true, true, partial, matcher)
+          matcher.match?(partial).should be_true # Sanity check.
+          expectation.satisfied?.should be_false
+        end
+      end
+    end
+
+    context "with an unsuccessful match" do
+      it "is false" do
+        value1 = 42
+        value2 = 777
+        block = ->{ value1 }
+        partial = Spectator::Expectations::BlockExpectationPartial.new(block.to_s, block)
+        matcher = Spectator::Matchers::EqualityMatcher.new(value2.to_s, value2)
+        expectation = Spectator::Expectations::BlockExpectation.new(false, false, partial, matcher)
+        matcher.match?(partial).should be_false # Sanity check.
+        expectation.satisfied?.should be_false
+      end
+
+      context "when negated" do
+        it "is true" do
+          value1 = 42
+          value2 = 777
+          block = ->{ value1 }
+          partial = Spectator::Expectations::BlockExpectationPartial.new(block.to_s, block)
+          matcher = Spectator::Matchers::EqualityMatcher.new(value2.to_s, value2)
+          expectation = Spectator::Expectations::BlockExpectation.new(false, true, partial, matcher)
+          matcher.match?(partial).should be_false # Sanity check.
+          expectation.satisfied?.should be_true
+        end
+      end
+    end
+  end
+
+  describe "#actual_message" do
+    context "with a successful match" do
+      it "equals the matcher's #message" do
+        value = 42
+        block = ->{ value }
+        partial = Spectator::Expectations::BlockExpectationPartial.new(block.to_s, block)
+        matcher = Spectator::Matchers::EqualityMatcher.new(value.to_s, value)
+        expectation = Spectator::Expectations::BlockExpectation.new(true, false, partial, matcher)
+        matcher.match?(partial).should be_true # Sanity check.
+        expectation.actual_message.should eq(matcher.message(partial))
+      end
+
+      context "when negated" do
+        it "equals the matcher's #negated_message" do
+          value = 42
+          block = ->{ value }
+          partial = Spectator::Expectations::BlockExpectationPartial.new(block.to_s, block)
+          matcher = Spectator::Matchers::EqualityMatcher.new(value.to_s, value)
+          expectation = Spectator::Expectations::BlockExpectation.new(true, true, partial, matcher)
+          matcher.match?(partial).should be_true # Sanity check.
+          expectation.actual_message.should eq(matcher.negated_message(partial))
+        end
+      end
+    end
+
+    context "with an unsuccessful match" do
+      it "equals the matcher's #negated_message" do
+        value1 = 42
+        value2 = 777
+        block = ->{ value1 }
+        partial = Spectator::Expectations::BlockExpectationPartial.new(block.to_s, block)
+        matcher = Spectator::Matchers::EqualityMatcher.new(value2.to_s, value2)
+        expectation = Spectator::Expectations::BlockExpectation.new(false, false, partial, matcher)
+        matcher.match?(partial).should be_false # Sanity check.
+        expectation.actual_message.should eq(matcher.negated_message(partial))
+      end
+
+      context "when negated" do
+        it "equals the matcher's #message" do
+          value1 = 42
+          value2 = 777
+          block = ->{ value1 }
+          partial = Spectator::Expectations::BlockExpectationPartial.new(block.to_s, block)
+          matcher = Spectator::Matchers::EqualityMatcher.new(value2.to_s, value2)
+          expectation = Spectator::Expectations::BlockExpectation.new(false, true, partial, matcher)
+          matcher.match?(partial).should be_false # Sanity check.
+          expectation.actual_message.should eq(matcher.message(partial))
+        end
+      end
+    end
+  end
+
+  describe "#expected_message" do
+    context "with a successful match" do
+      it "equals the matcher's #message" do
+        value = 42
+        block = ->{ value }
+        partial = Spectator::Expectations::BlockExpectationPartial.new(block.to_s, block)
+        matcher = Spectator::Matchers::EqualityMatcher.new(value.to_s, value)
+        expectation = Spectator::Expectations::BlockExpectation.new(true, false, partial, matcher)
+        matcher.match?(partial).should be_true # Sanity check.
+        expectation.expected_message.should eq(matcher.message(partial))
+      end
+
+      context "when negated" do
+        it "equals the matcher's #negated_message" do
+          value = 42
+          block = ->{ value }
+          partial = Spectator::Expectations::BlockExpectationPartial.new(block.to_s, block)
+          matcher = Spectator::Matchers::EqualityMatcher.new(value.to_s, value)
+          expectation = Spectator::Expectations::BlockExpectation.new(true, true, partial, matcher)
+          matcher.match?(partial).should be_true # Sanity check.
+          expectation.expected_message.should eq(matcher.negated_message(partial))
+        end
+      end
+    end
+
+    context "with an unsuccessful match" do
+      it "equals the matcher's #message" do
+        value1 = 42
+        value2 = 777
+        block = ->{ value1 }
+        partial = Spectator::Expectations::BlockExpectationPartial.new(block.to_s, block)
+        matcher = Spectator::Matchers::EqualityMatcher.new(value2.to_s, value2)
+        expectation = Spectator::Expectations::BlockExpectation.new(false, false, partial, matcher)
+        matcher.match?(partial).should be_false # Sanity check.
+        expectation.expected_message.should eq(matcher.message(partial))
+      end
+
+      context "when negated" do
+        it "equals the matcher's #negated_message" do
+          value1 = 42
+          value2 = 777
+          block = ->{ value1 }
+          partial = Spectator::Expectations::BlockExpectationPartial.new(block.to_s, block)
+          matcher = Spectator::Matchers::EqualityMatcher.new(value2.to_s, value2)
+          expectation = Spectator::Expectations::BlockExpectation.new(false, true, partial, matcher)
+          matcher.match?(partial).should be_false # Sanity check.
+          expectation.expected_message.should eq(matcher.negated_message(partial))
+        end
+      end
+    end
+  end
+end