Tweak output and fix tests

Author: tomasaschan

tools/setup-envtest/output/output.go

@@ -68,7 +68,7 @@ func (f PrintFormat) Sprintf(out io.Writer, version versions.Concrete, platform
 			return e
 		}
 		if md5 != "" {
-			if _, e := fmt.Fprintf(out, "md5: %s\n", md5); e != nil {
+			if _, e := fmt.Fprintf(out, "Checksum: %s\n", md5); e != nil {
 				return e
 			}
 		}

tools/setup-envtest/output/output_test.go

@@ -51,6 +51,10 @@ var _ = Describe("PrintFormat", func() {
 		path = "/kb's test store/k8s/1.21.3-linux-amd64"
 	})
 
+	JustBeforeEach(func() {
+		outBuffer = &bytes.Buffer{}
+	})
+
 	Describe("PrintOverview", func() {
 		JustBeforeEach(func() {
 			Expect(output.PrintOverview.Sprintf(