Support test fixtures in rust package

Replaces the rust specific rustTestCtx mechanism with the general test
fixtures mechanism as converting it to use preparers was not possible.

Also, removes usages of the buildDir variable and removes it as it is
no longer needed.

Bug: 181070625
Test: m nothing
Change-Id: I0176a7b6fb2d390ae23693f1e198da5124b4be63

1 files changed, 4 insertions, 5 deletions

diff --git a/rust/project_json_test.go b/rust/project_json_test.go
index 289bcb81d..8f64f56e2 100644
--- a/rust/project_json_test.go
+++ b/rust/project_json_test.go
@@ -27,15 +27,14 @@ import (
 // testProjectJson run the generation of rust-project.json. It returns the raw
 // content of the generated file.
 func testProjectJson(t *testing.T, bp string) []byte {
-	tctx := newTestRustCtx(t, bp)
-	tctx.env = map[string]string{"SOONG_GEN_RUST_PROJECT": "1"}
-	tctx.generateConfig()
-	tctx.parse(t)
+	result := prepareForRustTest.
+		Extend(android.FixtureMergeEnv(map[string]string{"SOONG_GEN_RUST_PROJECT": "1"})).
+		RunTestWithBp(t, bp)
 
 	// The JSON file is generated via WriteFileToOutputDir. Therefore, it
 	// won't appear in the Output of the TestingSingleton. Manually verify
 	// it exists.
-	content, err := ioutil.ReadFile(filepath.Join(buildDir, rustProjectJsonFileName))
+	content, err := ioutil.ReadFile(filepath.Join(result.Config.BuildDir(), rustProjectJsonFileName))
 	if err != nil {
 		t.Errorf("rust-project.json has not been generated")
 	}