diff --git a/Library/Homebrew/test/utils/analytics_spec.rb b/Library/Homebrew/test/utils/analytics_spec.rb
index cee09e2861..96a9a4f7ff 100644
--- a/Library/Homebrew/test/utils/analytics_spec.rb
+++ b/Library/Homebrew/test/utils/analytics_spec.rb
@@ -1,19 +1,27 @@
 require "utils/analytics"
+require "formula_installer"
 
 describe Utils::Analytics do
   describe "::os_prefix_ci" do
     context "when anonymous_os_prefix_ci is not set" do
+      before(:each) do
+        if described_class.instance_variable_defined?(:@anonymous_os_prefix_ci)
+          described_class.send(:remove_instance_variable, :@anonymous_os_prefix_ci)
+        end
+      end
+
       it "returns OS_VERSION and prefix when HOMEBREW_PREFIX is not /usr/local" do
+        stub_const("HOMEBREW_PREFIX", "blah")
         expect(described_class.os_prefix_ci).to include("#{OS_VERSION}, non-/usr/local")
       end
 
       it "includes CI when ENV['CI'] is set" do
-        allow(ENV).to receive(:[]).with("CI").and_return("true")
+        ENV["CI"] = "true"
         expect(described_class.os_prefix_ci).to include("CI")
       end
 
       it "does not include prefix when HOMEBREW_PREFIX is usr/local" do
-        allow(HOMEBREW_PREFIX).to receive(:to_s).and_return("/usr/local")
+        stub_const("HOMEBREW_PREFIX", "/usr/local")
         expect(described_class.os_prefix_ci).not_to include("non-/usr/local")
       end
     end
@@ -28,7 +36,39 @@ describe Utils::Analytics do
     end
   end
 
-  describe "::" do
-    
+  describe "::report_event" do
+    let(:f) { formula { url "foo-1.0" } }
+    let(:options) { FormulaInstaller.new(f).display_options(f) }
+    let(:action)  { "#{f.full_name} #{options}".strip }
+
+    context "when ENV vars is set" do
+      it "returns nil when HOMEBREW_NO_ANALYTICS is true" do
+        ENV["HOMEBREW_NO_ANALYTICS"] = "true"
+        expect(described_class.report_event("install", action)).to be_nil
+      end
+
+      it "returns nil when HOMEBREW_NO_ANALYTICS_THIS_RUN is true" do
+        ENV["HOMEBREW_NO_ANALYTICS_THIS_RUN"] = "true"
+        expect(described_class.report_event("install", action)).to be_nil
+      end
+
+      it "returns nil when HOMEBREW_ANALYTICS_DEBUG is true" do
+        ENV["HOMEBREW_NO_ANALYTICS_THIS_RUN"] = nil
+        ENV["HOMEBREW_NO_ANALYTICS"] = nil
+        ENV["HOMEBREW_ANALYTICS_DEBUG"] = "true"
+        expect(described_class.report_event("install", action)).to be_nil
+      end
+    end
+
+    context "when ENV vars are nil" do
+      before do
+        ENV["HOMEBREW_NO_ANALYTICS"] = nil
+        ENV["HOMEBREW_NO_ANALYTICS_THIS_RUN"] = nil
+      end
+
+      it "returns nil when HOMEBREW_ANALYTICS_DEBUG is not set" do
+        expect(described_class.report_event("install", action)).to be_an_instance_of(Thread)
+      end
+    end
   end
-end
\ No newline at end of file
+end