Test null stub

spec/spectator/mocks/null_stub_spec.cr

@@ -0,0 +1,83 @@
+require "../../spec_helper"
+
+Spectator.describe Spectator::NullStub do
+  let(method_call) { Spectator::MethodCall.capture(:foo) }
+  subject(stub) { described_class.new(:foo) }
+
+  it "stores the method name" do
+    expect(stub.method).to eq(:foo)
+  end
+
+  it "returns nil" do
+    expect(stub.call(method_call)).to be_nil
+  end
+
+  context Spectator::StubModifiers do
+    describe "#and_return(value)" do
+      let(arguments) { Spectator::Arguments.capture(/foo/) }
+      let(original) { Spectator::NullStub.new(:foo, arguments) }
+      subject(stub) { original.and_return(42) }
+
+      it "produces a stub that returns a value" do
+        expect(stub.call(method_call)).to eq(42)
+      end
+
+      it "retains the method name" do
+        expect(stub.method).to eq(:foo)
+      end
+
+      it "retains the arguments constraint" do
+        expect(stub.constraint).to eq(arguments)
+      end
+    end
+  end
+
+  describe "#===" do
+    subject { stub === call }
+
+    context "with a matching method name" do
+      let(call) { Spectator::MethodCall.capture(:foo, "foobar") }
+
+      it "returns true" do
+        is_expected.to be_true
+      end
+    end
+
+    context "with a different method name" do
+      let(call) { Spectator::MethodCall.capture(:bar, "foobar") }
+
+      it "returns false" do
+        is_expected.to be_false
+      end
+    end
+
+    context "with a constraint" do
+      let(constraint) { Spectator::Arguments.capture(/foo/) }
+      let(stub) { described_class.new(:foo, constraint) }
+
+      context "with a matching method name" do
+        let(call) { Spectator::MethodCall.capture(:foo, "foobar") }
+
+        it "returns true" do
+          is_expected.to be_true
+        end
+
+        context "with a non-matching arguments" do
+          let(call) { Spectator::MethodCall.capture(:foo, "baz") }
+
+          it "returns false" do
+            is_expected.to be_false
+          end
+        end
+      end
+
+      context "with a different method name" do
+        let(call) { Spectator::MethodCall.capture(:bar, "foobar") }
+
+        it "returns false" do
+          is_expected.to be_false
+        end
+      end
+    end
+  end
+end