cmd/go: add fuzzing coverage test

Adds a test script for fuzzing coverage instrumentation. Fixes #48654 Change-Id: Ieea7b4146bd5581baae869441cc1c652dd7485f5 Reviewed-on: https://go-review.googlesource.com/c/go/+/375736 Trust: Katie Hockman <[email protected]> Reviewed-by: Katie Hockman <[email protected]> Trust: Roland Shoemaker <[email protected]> Run-TryBot: Roland Shoemaker <[email protected]> TryBot-Result: Gopher Robot <[email protected]>
golang · Jan 5, 2022 · 2b39d86 · 2b39d86
1 parent 88cafe0
commit 2b39d86
Showing 1 changed file with 33 additions and 0 deletions.
diff --git a/src/cmd/go/testdata/script/test_fuzz_cov.txt b/src/cmd/go/testdata/script/test_fuzz_cov.txt
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+# Test that coverage instrumentation is working. Without the instrumentation
+# it is _extremely_ unlikely that the fuzzer would produce this particular
+# input in any reasonable amount of time.
+
+[short] skip
+[!fuzz-instrumented] skip
+
+! go test -fuzz=FuzzCov
+! stderr 'cov instrumentation working'
+
+-- go.mod --
+module test
+
+-- cov_test.go --
+package cov
+
+import "testing"
+
+func FuzzCov(f *testing.F) {
+	f.Fuzz(func(t *testing.T, b []byte) {
+		if len(b) == 8 &&
+			b[0] == 'h' &&
+			b[1] == 'e' &&
+			b[2] == 'l' &&
+			b[3] == 'l' &&
+			b[4] == 'o' &&
+			b[5] == ' ' &&
+			b[6] == ':' &&
+			b[7] == ')' {
+			panic("cov instrumentation working")
+		}
+	})
+}