test/language/java_spec: test both Mac and Linux

Library/Homebrew/test/language/java_spec.rb

@@ -11,6 +11,14 @@ describe Language::Java do
     end
   end
 
+  let(:expected_home) do
+    if OS.mac?
+      f.opt_libexec/"openjdk.jdk/Contents/Home"
+    else
+      f.opt_libexec
+    end
+  end
+
   before do
     allow(Formula).to receive(:[]).and_return(f)
     allow(f).to receive(:any_version_installed?).and_return(true)
@@ -18,48 +26,38 @@ describe Language::Java do
   end
 
   describe "::java_home" do
-    it "returns valid JAVA_HOME if version is specified", :needs_macos do
+    it "returns valid JAVA_HOME if version is specified" do
       java_home = described_class.java_home("1.8+")
-      expect(java_home).to eql(f.opt_libexec/"openjdk.jdk/Contents/Home")
+      expect(java_home).to eql(expected_home)
     end
 
-    it "returns valid JAVA_HOME if version is not specified", :needs_macos do
+    it "returns valid JAVA_HOME if version is not specified" do
       java_home = described_class.java_home
-      expect(java_home).to eql(f.opt_libexec/"openjdk.jdk/Contents/Home")
+      expect(java_home).to eql(expected_home)
-    end
-
-    it "returns valid JAVA_HOME if version is specified", :needs_linux do
-      java_home = described_class.java_home("1.8+")
-      expect(java_home).to eql(f.opt_libexec)
-    end
-
-    it "returns valid JAVA_HOME if version is not specified", :needs_linux do
-      java_home = described_class.java_home
-      expect(java_home).to eql(f.opt_libexec)
     end
   end
 
   describe "::java_home_env" do
     it "returns java_home path if version specified" do
       java_home_env = described_class.java_home_env("1.8+")
-      expect(java_home_env[:JAVA_HOME]).to include(f.opt_libexec.to_s)
+      expect(java_home_env[:JAVA_HOME]).to eql(expected_home.to_s)
     end
 
     it "returns java_home path if version is not specified" do
       java_home_env = described_class.java_home_env
-      expect(java_home_env[:JAVA_HOME]).to include(f.opt_libexec.to_s)
+      expect(java_home_env[:JAVA_HOME]).to eql(expected_home.to_s)
     end
   end
 
   describe "::overridable_java_home_env" do
     it "returns java_home path if version specified" do
       overridable_java_home_env = described_class.overridable_java_home_env("1.8+")
-      expect(overridable_java_home_env[:JAVA_HOME]).to include(f.opt_libexec.to_s)
+      expect(overridable_java_home_env[:JAVA_HOME]).to eql("${JAVA_HOME:-#{expected_home}}")
     end
 
     it "returns java_home path if version is not specified" do
       overridable_java_home_env = described_class.overridable_java_home_env
-      expect(overridable_java_home_env[:JAVA_HOME]).to include(f.opt_libexec.to_s)
+      expect(overridable_java_home_env[:JAVA_HOME]).to eql("${JAVA_HOME:-#{expected_home}}")
     end
   end
 end