test: sandbox: add test for erase command

Add test for the erase command tested on ENV in EXT4.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/configs/sandbox64_defconfig b/configs/sandbox64_defconfig
index 8a14285..1228c49 100644
--- a/configs/sandbox64_defconfig
+++ b/configs/sandbox64_defconfig
@@ -27,6 +27,7 @@
 # CONFIG_CMD_ELF is not set
 CONFIG_CMD_ASKENV=y
 CONFIG_CMD_GREPENV=y
+CONFIG_CMD_ERASEENV=y
 CONFIG_CMD_ENV_CALLBACK=y
 CONFIG_CMD_ENV_FLAGS=y
 CONFIG_CMD_NVEDIT_EFI=y
diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig
index 0fce901..f4f97f3 100644
--- a/configs/sandbox_defconfig
+++ b/configs/sandbox_defconfig
@@ -32,6 +32,7 @@
 # CONFIG_CMD_ELF is not set
 CONFIG_CMD_ASKENV=y
 CONFIG_CMD_GREPENV=y
+CONFIG_CMD_ERASEENV=y
 CONFIG_CMD_ENV_CALLBACK=y
 CONFIG_CMD_ENV_FLAGS=y
 CONFIG_CMD_NVEDIT_EFI=y
diff --git a/configs/sandbox_flattree_defconfig b/configs/sandbox_flattree_defconfig
index e91e9de..78d732d 100644
--- a/configs/sandbox_flattree_defconfig
+++ b/configs/sandbox_flattree_defconfig
@@ -24,6 +24,7 @@
 # CONFIG_CMD_ELF is not set
 CONFIG_CMD_ASKENV=y
 CONFIG_CMD_GREPENV=y
+CONFIG_CMD_ERASEENV=y
 CONFIG_CMD_NVEDIT_INFO=y
 CONFIG_CMD_NVEDIT_LOAD=y
 CONFIG_CMD_NVEDIT_SELECT=y
diff --git a/configs/sandbox_spl_defconfig b/configs/sandbox_spl_defconfig
index 5298b78..b846487 100644
--- a/configs/sandbox_spl_defconfig
+++ b/configs/sandbox_spl_defconfig
@@ -34,6 +34,7 @@
 # CONFIG_CMD_ELF is not set
 CONFIG_CMD_ASKENV=y
 CONFIG_CMD_GREPENV=y
+CONFIG_CMD_ERASEENV=y
 CONFIG_CMD_ENV_CALLBACK=y
 CONFIG_CMD_ENV_FLAGS=y
 CONFIG_CMD_NVEDIT_INFO=y
diff --git a/test/py/tests/test_env.py b/test/py/tests/test_env.py
index 70913c8..86ec1b3 100644
--- a/test/py/tests/test_env.py
+++ b/test/py/tests/test_env.py
@@ -475,6 +475,22 @@
         response = c.run_command('echo $?')
         assert response == "0"
 
+        response = c.run_command('env erase')
+        assert 'OK' in response
+
+        response = c.run_command('env load')
+        assert 'Loading Environment from EXT4... ' in response
+        assert 'bad CRC, using default environment' in response
+
+        response = c.run_command('env info')
+        assert 'env_valid = invalid' in response
+        assert 'env_ready = true' in response
+        assert 'env_use_default = true' in response
+
+        response = c.run_command('env info -p -d')
+        assert 'Default environment is used' in response
+        assert 'Environment can be persisted' in response
+
         # restore env location: NOWHERE (prio 0 in sandbox)
         response = c.run_command('env select nowhere')
         assert 'Select Environment on nowhere: OK' in response