Fix OS version logic for uses_from_macos

Library/Homebrew/extend/os/mac/software_spec.rb

@@ -23,9 +23,9 @@ class SoftwareSpec
   def add_mac_dependency?(args)
     args.each { |key, version| args[key] = OS::Mac::Version.from_symbol(version) }
 
-    return false if args[:after] && OS::Mac.version < args[:after]
+    return false if args[:after] && OS::Mac.version >= args[:after]
 
-    return false if args[:before] && OS::Mac.version >= args[:before]
+    return false if args[:before] && OS::Mac.version < args[:before]
 
     args.present?
   end

Library/Homebrew/test/os/mac/software_spec_spec.rb

@@ -13,27 +13,30 @@ describe SoftwareSpec do
       allow(OS::Mac).to receive(:version).and_return(OS::Mac::Version.new(sierra_os_version))
     end
 
-    it "allows specifying dependencies before certain version" do
+    it "allows specifying macOS dependencies before a certain version" do
       spec.uses_from_macos("foo", before: :high_sierra)
 
-      expect(spec.deps.first.name).to eq("foo")
+      expect(spec.deps).to be_empty
+      expect(spec.uses_from_macos_elements.first).to eq("foo")
     end
 
-    it "allows specifying dependencies after certain version" do
+    it "allows specifying macOS dependencies after a certain version" do
       spec.uses_from_macos("foo", after: :el_capitan)
 
-      expect(spec.deps.first.name).to eq("foo")
+      expect(spec.deps).to be_empty
+      expect(spec.uses_from_macos_elements.first).to eq("foo")
     end
 
-    it "doesn't adds a dependency if it doesn't meet OS version requirements" do
+    it "doesn't add a macOS dependency if the OS version doesn't meet requirements" do
       spec.uses_from_macos("foo", after: :high_sierra)
       spec.uses_from_macos("bar", before: :el_capitan)
 
-      expect(spec.deps).to be_empty
+      expect(spec.deps.first.name).to eq("foo")
+      expect(spec.uses_from_macos_elements).to be_empty
     end
 
     it "works with tags" do
-      spec.uses_from_macos("foo" => :head, :after => :el_capitan)
+      spec.uses_from_macos("foo" => :head, :after => :high_sierra)
 
       dep = spec.deps.first
 
@@ -41,7 +44,7 @@ describe SoftwareSpec do
       expect(dep.tags).to include(:head)
     end
 
-    it "doesn't adds the dependency without OS version requirements" do
+    it "doesn't add a dependency if no OS version is specified" do
       spec.uses_from_macos("foo")
       spec.uses_from_macos("bar" => :head)
 
@@ -49,7 +52,7 @@ describe SoftwareSpec do
     end
 
     it "respects OS version requirements with tags" do
-      spec.uses_from_macos("foo" => :head, :after => :mojave)
+      spec.uses_from_macos("foo" => :head, :before => :mojave)
 
       expect(spec.deps).to be_empty
     end