Refactor and strengthen sdk_test.go.

This change:

- Removes usage of the EXPERIMENTAL_JAVA_LANGUAGE_LEVEL_9=false option
  from tests, since it is going to be removed. The java_version
  property is used instead.

- Commons up some of the assertions between the tests for language
  levels 8 and 9 in sdk_test.go.

- In commoning the code up, some additional assertions are made in the
  language level 9 cases, strengthening the tests.

Test: m nothing
Bug: 115604102

Change-Id: I693c5d299b5592b851c44dde4434d92a931f15cd

java/java_test.go

@@ -1073,32 +1073,32 @@ func checkPatchModuleFlag(t *testing.T, ctx *android.TestContext, moduleName str
 }
 
 func TestPatchModule(t *testing.T) {
-	bp := `
-		java_library {
-			name: "foo",
-			srcs: ["a.java"],
-		}
-
-		java_library {
-			name: "bar",
-			srcs: ["b.java"],
-			sdk_version: "none",
-			system_modules: "none",
-			patch_module: "java.base",
-		}
-
-		java_library {
-			name: "baz",
-			srcs: ["c.java"],
-			patch_module: "java.base",
-		}
-	`
-
 	t.Run("Java language level 8", func(t *testing.T) {
 		// Test with legacy javac -source 1.8 -target 1.8
-		config := testConfig(map[string]string{"EXPERIMENTAL_JAVA_LANGUAGE_LEVEL_9": "false"})
-		ctx := testContext(bp, nil)
-		run(t, ctx, config)
+		bp := `
+			java_library {
+				name: "foo",
+				srcs: ["a.java"],
+				java_version: "1.8",
+			}
+
+			java_library {
+				name: "bar",
+				srcs: ["b.java"],
+				sdk_version: "none",
+				system_modules: "none",
+				patch_module: "java.base",
+				java_version: "1.8",
+			}
+
+			java_library {
+				name: "baz",
+				srcs: ["c.java"],
+				patch_module: "java.base",
+				java_version: "1.8",
+			}
+		`
+		ctx, _ := testJava(t, bp)
 
 		checkPatchModuleFlag(t, ctx, "foo", "")
 		checkPatchModuleFlag(t, ctx, "bar", "")
@@ -1107,6 +1107,26 @@ func TestPatchModule(t *testing.T) {
 
 	t.Run("Java language level 9", func(t *testing.T) {
 		// Test with default javac -source 9 -target 9
+		bp := `
+			java_library {
+				name: "foo",
+				srcs: ["a.java"],
+			}
+
+			java_library {
+				name: "bar",
+				srcs: ["b.java"],
+				sdk_version: "none",
+				system_modules: "none",
+				patch_module: "java.base",
+			}
+
+			java_library {
+				name: "baz",
+				srcs: ["c.java"],
+				patch_module: "java.base",
+			}
+		`
 		ctx, _ := testJava(t, bp)
 
 		checkPatchModuleFlag(t, ctx, "foo", "")