tests: Add some env var testing to loader tests.

Tests recently added env var parsing code added to loader.

Change-Id: Ic58d92dfeaed725f02a8f4a79c60d9b4b363aa3f

Author: karl-lunarg

tests/run_loader_tests.sh

@@ -2,6 +2,62 @@
 
 pushd $(dirname "$0") > /dev/null
 
+RunEnvironmentVariablePathsTest()
+{
+    # Check for proper handling of paths specified via environment variables.
+
+    # Set up a layer path that includes default and user-specified locations,
+    # so that the test app can find them.  Include some badly specified elements as well.
+    vk_layer_path="$VK_LAYER_PATH"
+    vk_layer_path+=":/usr/local/etc/vulkan/implicit_layer.d:/usr/local/share/vulkan/implicit_layer.d"
+    vk_layer_path+=":/tmp/carol:::"
+    vk_layer_path+=":/etc/vulkan/implicit_layer.d:/usr/share/vulkan/implicit_layer.d:$HOME/.local/share/vulkan/implicit_layer.d"
+    vk_layer_path+=":::::/tandy:"
+
+    # Set vars to include some "challenging" paths and run the test.
+    output=$(VK_LOADER_DEBUG=all \
+       XDG_CONFIG_DIRS=":/tmp/goober:::::/tmp/goober2/:/tmp/goober3/with spaces:::" \
+       XDG_DATA_DIRS="::::/tmp/goober4:::::/tmp/goober5:/tmp/goober6/with spaces::::/tmp/goober7:" \
+       VK_LAYER_PATH=${vk_layer_path} \
+       GTEST_FILTER=CreateInstance.LayerPresent \
+       ./vk_loader_validation_tests 2>&1)
+
+    # Here is a path we expect to find.  The loader constructs these from the XDG* env vars. 
+    right_path="/tmp/goober/vulkan/icd.d:/tmp/goober2//vulkan/icd.d:/tmp/goober3/with spaces/vulkan/icd.d"
+    # There are other paths that come from SYSCONFIG settings established at build time.
+    # So we can't really guess at what those are here.
+    right_path+=".*"
+    # Also expect to find these, since we added them.
+    right_path+="/tmp/goober4/vulkan/icd.d:/tmp/goober5/vulkan/icd.d:/tmp/goober6/with spaces/vulkan/icd.d:/tmp/goober7/vulkan/icd.d"
+    echo "$output" | grep -q "$right_path"
+    ec=$?
+    if [ $ec -eq 1 ]
+    then
+       echo "Environment Variable Path test FAILED - ICD path incorrect" >&2
+       exit 1
+    fi
+    # Change the string to implicit layers.
+    right_path=${right_path//icd.d/implicit_layer.d}
+    echo "$output" | grep -q "$right_path"
+    ec=$?
+    if [ $ec -eq 1 ]
+    then
+       echo "Environment Variable Path test FAILED - Implicit layer path incorrect" >&2
+       exit 1
+    fi
+    # Sadly, the loader does not clean up this path and just stumbles through it.
+    # So just make sure it is the same.
+    right_path="${vk_layer_path}"
+    echo "$output" | grep -q "$right_path"
+    ec=$?
+    if [ $ec -eq 1 ]
+    then
+       echo "Environment Variable Path test FAILED - VK_LAYER_PATH incorrect" >&2
+       exit 1
+    fi
+    echo "Environment Variable Path test PASSED"
+}
+
 RunCreateInstanceTest()
 {
     # Check for layer insertion via CreateInstance.
@@ -78,6 +134,7 @@ RunEnumerateInstanceExtensionPropertiesTest()
 
 ./vk_loader_validation_tests
 
+RunEnvironmentVariablePathsTest
 RunCreateInstanceTest
 RunEnumerateInstanceLayerPropertiesTest
 RunEnumerateInstanceExtensionPropertiesTest