test/py: add test of setenv/printenv/echo

This tests basic environment variable functionality.

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>

1 files changed, 221 insertions, 0 deletions

diff --git a/test/py/tests/test_env.py b/test/py/tests/test_env.py
new file mode 100644
index 0000000000..a3e8dd3033
--- /dev/null
+++ b/test/py/tests/test_env.py
@@ -0,0 +1,221 @@
+# Copyright (c) 2015 Stephen Warren
+# Copyright (c) 2015-2016, NVIDIA CORPORATION. All rights reserved.
+#
+# SPDX-License-Identifier: GPL-2.0
+
+# Test operation of shell commands relating to environment variables.
+
+import pytest
+
+# FIXME: This might be useful for other tests;
+# perhaps refactor it into ConsoleBase or some other state object?
+class StateTestEnv(object):
+    '''Container that represents the state of all U-Boot environment variables.
+    This enables quick determination of existant/non-existant variable
+    names.
+    '''
+
+    def __init__(self, u_boot_console):
+        '''Initialize a new StateTestEnv object.
+
+        Args:
+            u_boot_console: A U-Boot console.
+
+        Returns:
+            Nothing.
+        '''
+
+        self.u_boot_console = u_boot_console
+        self.get_env()
+        self.set_var = self.get_non_existent_var()
+
+    def get_env(self):
+        '''Read all current environment variables from U-Boot.
+
+        Args:
+            None.
+
+        Returns:
+            Nothing.
+        '''
+
+        response = self.u_boot_console.run_command('printenv')
+        self.env = {}
+        for l in response.splitlines():
+            if not '=' in l:
+                continue
+            (var, value) = l.strip().split('=', 1)
+            self.env[var] = value
+
+    def get_existent_var(self):
+        '''Return the name of an environment variable that exists.
+
+        Args:
+            None.
+
+        Returns:
+            The name of an environment variable.
+        '''
+
+        for var in self.env:
+            return var
+
+    def get_non_existent_var(self):
+        '''Return the name of an environment variable that does not exist.
+
+        Args:
+            None.
+
+        Returns:
+            The name of an environment variable.
+        '''
+
+        n = 0
+        while True:
+            var = 'test_env_' + str(n)
+            if var not in self.env:
+                return var
+            n += 1
+
+@pytest.fixture(scope='module')
+def state_test_env(u_boot_console):
+    '''pytest fixture to provide a StateTestEnv object to tests.'''
+
+    return StateTestEnv(u_boot_console)
+
+def unset_var(state_test_env, var):
+    '''Unset an environment variable.
+
+    This both executes a U-Boot shell command and updates a StateTestEnv
+    object.
+
+    Args:
+        state_test_env: The StateTestEnv object to updata.
+        var: The variable name to unset.
+
+    Returns:
+        Nothing.
+    '''
+
+    state_test_env.u_boot_console.run_command('setenv %s' % var)
+    if var in state_test_env.env:
+        del state_test_env.env[var]
+
+def set_var(state_test_env, var, value):
+    '''Set an environment variable.
+
+    This both executes a U-Boot shell command and updates a StateTestEnv
+    object.
+
+    Args:
+        state_test_env: The StateTestEnv object to updata.
+        var: The variable name to set.
+        value: The value to set the variable to.
+
+    Returns:
+        Nothing.
+    '''
+
+    state_test_env.u_boot_console.run_command('setenv %s "%s"' % (var, value))
+    state_test_env.env[var] = value
+
+def validate_empty(state_test_env, var):
+    '''Validate that a variable is not set, using U-Boot shell commands.
+
+    Args:
+        var: The variable name to test.
+
+    Returns:
+        Nothing.
+    '''
+
+    response = state_test_env.u_boot_console.run_command('echo $%s' % var)
+    assert response == ''
+
+def validate_set(state_test_env, var, value):
+    '''Validate that a variable is set, using U-Boot shell commands.
+
+    Args:
+        var: The variable name to test.
+        value: The value the variable is expected to have.
+
+    Returns:
+        Nothing.
+    '''
+
+    # echo does not preserve leading, internal, or trailing whitespace in the
+    # value. printenv does, and hence allows more complete testing.
+    response = state_test_env.u_boot_console.run_command('printenv %s' % var)
+    assert response == ('%s=%s' % (var, value))
+
+def test_env_echo_exists(state_test_env):
+    '''Test echoing a variable that exists.'''
+
+    var = state_test_env.get_existent_var()
+    value = state_test_env.env[var]
+    validate_set(state_test_env, var, value)
+
+def test_env_echo_non_existent(state_test_env):
+    '''Test echoing a variable that doesn't exist.'''
+
+    var = state_test_env.set_var
+    validate_empty(state_test_env, var)
+
+def test_env_printenv_non_existent(state_test_env):
+    '''Test printenv error message for non-existant variables.'''
+
+    var = state_test_env.set_var
+    c = state_test_env.u_boot_console
+    with c.disable_check('error_notification'):
+        response = c.run_command('printenv %s' % var)
+    assert(response == '## Error: "%s" not defined' % var)
+
+def test_env_unset_non_existent(state_test_env):
+    '''Test unsetting a nonexistent variable.'''
+
+    var = state_test_env.get_non_existent_var()
+    unset_var(state_test_env, var)
+    validate_empty(state_test_env, var)
+
+def test_env_set_non_existent(state_test_env):
+    '''Test set a non-existant variable.'''
+
+    var = state_test_env.set_var
+    value = 'foo'
+    set_var(state_test_env, var, value)
+    validate_set(state_test_env, var, value)
+
+def test_env_set_existing(state_test_env):
+    '''Test setting an existant variable.'''
+
+    var = state_test_env.set_var
+    value = 'bar'
+    set_var(state_test_env, var, value)
+    validate_set(state_test_env, var, value)
+
+def test_env_unset_existing(state_test_env):
+    '''Test unsetting a variable.'''
+
+    var = state_test_env.set_var
+    unset_var(state_test_env, var)
+    validate_empty(state_test_env, var)
+
+def test_env_expansion_spaces(state_test_env):
+    '''Test expanding a variable that contains a space in its value.'''
+
+    var_space = None
+    var_test = None
+    try:
+        var_space = state_test_env.get_non_existent_var()
+        set_var(state_test_env, var_space, ' ')
+
+        var_test = state_test_env.get_non_existent_var()
+        value = ' 1${%(var_space)s}${%(var_space)s} 2 ' % locals()
+        set_var(state_test_env, var_test, value)
+        value = ' 1   2 '
+        validate_set(state_test_env, var_test, value)
+    finally:
+        if var_space:
+            unset_var(state_test_env, var_space)
+        if var_test:
+            unset_var(state_test_env, var_test)