Prevent duplicate entries in vcr results (GoogleCloudPlatform#10068)

* Prevent duplicate entries in vcr results

* Create empty map

* Only collect result from current test

.ci/magician/vcr/tester.go

@@ -223,12 +223,13 @@ func (vt *Tester) Run(mode Mode, version provider.Version, testDirs []string) (*
 	logFileName := filepath.Join(vt.baseDir, "testlogs", fmt.Sprintf("%s_test.log", mode.Lower()))
 	// Write output (or error) to test log.
 	// Append to existing log file.
-	previousLog, _ := vt.rnr.ReadFile(logFileName)
-	if previousLog != "" {
-		output = previousLog + "\n" + output
+	allOutput, _ := vt.rnr.ReadFile(logFileName)
+	if allOutput != "" {
+		allOutput += "\n"
 	}
-	if err := vt.rnr.WriteFile(logFileName, output); err != nil {
-		return nil, fmt.Errorf("error writing log: %v, test output: %v", err, output)
+	allOutput += output
+	if err := vt.rnr.WriteFile(logFileName, allOutput); err != nil {
+		return nil, fmt.Errorf("error writing log: %v, test output: %v", err, allOutput)
 	}
 	return collectResult(output), testErr
 }
@@ -319,7 +320,7 @@ func (vt *Tester) runInParallel(mode Mode, version provider.Version, testDir, te
 		"-parallel",
 		"1",
 		"-v",
-		"-run=" + test,
+		"-run=" + test + "$",
 		"-timeout",
 		replayingTimeout,
 		"-ldflags=-X=github.com/hashicorp/terraform-provider-google-beta/version.ProviderVersion=acc",
@@ -473,19 +474,26 @@ func (vt *Tester) printLogs(logPath string) {
 
 func collectResult(output string) *Result {
 	matches := testResultsExpression.FindAllStringSubmatch(output, -1)
-	results := make(map[string][]string, 4)
+	resultSets := make(map[string]map[string]struct{}, 4)
 	for _, submatches := range matches {
 		if len(submatches) != 3 {
 			fmt.Printf("Warning: unexpected regex match found in test output: %v", submatches)
 			continue
 		}
-		results[submatches[1]] = append(results[submatches[1]], submatches[2])
+		if _, ok := resultSets[submatches[1]]; !ok {
+			resultSets[submatches[1]] = make(map[string]struct{})
+		}
+		resultSets[submatches[1]][submatches[2]] = struct{}{}
 	}
+	results := make(map[string][]string, 4)
 	results["PANIC"] = testPanicExpression.FindAllString(output, -1)
-	sort.Strings(results["FAIL"])
-	sort.Strings(results["PASS"])
-	sort.Strings(results["SKIP"])
 	sort.Strings(results["PANIC"])
+	for _, kind := range []string{"FAIL", "PASS", "SKIP"} {
+		for test := range resultSets[kind] {
+			results[kind] = append(results[kind], test)
+		}
+		sort.Strings(results[kind])
+	}
 	return &Result{
 		FailedTests:  results["FAIL"],
 		PassedTests:  results["PASS"],