add tests

tests/expected/function-contract/modifies_slice/nondeterministic_size.expected

@@ -0,0 +1,5 @@
+assertion\
+- Status: SUCCESS\
+- Description: "|_| x.into_iter().map(|v| *v == 0).fold(true,|a,b|a&b)"\
+
+VERIFICATION:- SUCCESSFUL

tests/expected/function-contract/modifies_slice/nondeterministic_size.rs

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+// Copyright Kani Contributors
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+// kani-flags: -Zfunction-contracts
+
+// Test that modifies a slice of nondeterministic size
+
+#[kani::modifies(x)]
+#[kani::ensures(|_| x.into_iter().map(|v| *v == 0).fold(true,|a,b|a&b))]
+fn zero(x: &mut [u8]) {
+    x.fill(0)
+}
+
+#[kani::proof_for_contract(zero)]
+fn harness() {
+    let mut x = [0..kani::any()].map(|_| kani::any());
+    zero(&mut x);
+}

tests/expected/function-contract/modifies_slice/u8slice.expected

@@ -0,0 +1,5 @@
+assertion\
+- Status: SUCCESS\
+- Description: "|_| x.into_iter().map(|v| *v == 0).fold(true,|a,b|a&b)"\
+
+VERIFICATION:- SUCCESSFUL

tests/expected/function-contract/modifies_slice/u8slice.rs

@@ -0,0 +1,17 @@
+// Copyright Kani Contributors
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+// kani-flags: -Zfunction-contracts
+
+// Test that modifies a slice containing bytesize data
+
+#[kani::modifies(x)]
+#[kani::ensures(|_| x.into_iter().map(|v| *v == 0).fold(true,|a,b|a&b))]
+fn zero(x: &mut [u8]) {
+    x.fill(0)
+}
+
+#[kani::proof_for_contract(zero)]
+fn harness() {
+    let mut x = [kani::any(), kani::any(), kani::any()];
+    zero(&mut x);
+}