Rename validation tests to comply with Google style guide.
diff --git a/test/val/CMakeLists.txt b/test/val/CMakeLists.txt
index 7988fe5..b00abc3 100644
--- a/test/val/CMakeLists.txt
+++ b/test/val/CMakeLists.txt
@@ -16,55 +16,55 @@
   ${CMAKE_CURRENT_SOURCE_DIR}/../test_fixture.h
   ${CMAKE_CURRENT_SOURCE_DIR}/../unit_spirv.h
   ${CMAKE_CURRENT_SOURCE_DIR}/../unit_spirv.cpp
-  ${CMAKE_CURRENT_SOURCE_DIR}/ValidateFixtures.h
-  ${CMAKE_CURRENT_SOURCE_DIR}/ValidateFixtures.cpp
+  ${CMAKE_CURRENT_SOURCE_DIR}/val_fixtures.h
+  ${CMAKE_CURRENT_SOURCE_DIR}/val_fixtures.cpp
 )
 
 
 add_spvtools_unittest(TARGET val_capability
-  SRCS ${CMAKE_CURRENT_SOURCE_DIR}/Validate.Capability.cpp
+  SRCS val_capability_test.cpp
        ${VAL_TEST_COMMON_SRCS}
   LIBS ${SPIRV_TOOLS}
 )
 
 add_spvtools_unittest(TARGET val_cfg
-  SRCS ${CMAKE_CURRENT_SOURCE_DIR}/Validate.CFG.cpp
+  SRCS val_cfg_test.cpp
        ${VAL_TEST_COMMON_SRCS}
   LIBS ${SPIRV_TOOLS}
 )
 
 add_spvtools_unittest(TARGET val_id
-  SRCS ${CMAKE_CURRENT_SOURCE_DIR}/ValidateID.cpp
+  SRCS val_id_test.cpp
        ${VAL_TEST_COMMON_SRCS}
   LIBS ${SPIRV_TOOLS}
 )
 
 add_spvtools_unittest(TARGET val_layout
-  SRCS ${CMAKE_CURRENT_SOURCE_DIR}/Validate.Layout.cpp
+  SRCS val_layout_test.cpp
        ${VAL_TEST_COMMON_SRCS}
   LIBS ${SPIRV_TOOLS}
 )
 
 add_spvtools_unittest(TARGET val_ssa
-  SRCS ${CMAKE_CURRENT_SOURCE_DIR}/Validate.SSA.cpp
+  SRCS val_ssa_test.cpp
        ${VAL_TEST_COMMON_SRCS}
   LIBS ${SPIRV_TOOLS}
 )
 
 add_spvtools_unittest(TARGET val_storage
-  SRCS ${CMAKE_CURRENT_SOURCE_DIR}/Validate.Storage.cpp
+  SRCS val_storage_test.cpp
        ${VAL_TEST_COMMON_SRCS}
   LIBS ${SPIRV_TOOLS}
 )
 
 add_spvtools_unittest(TARGET val_state
-  SRCS ${CMAKE_CURRENT_SOURCE_DIR}/ValidationState.cpp
+  SRCS val_state_test.cpp
        ${VAL_TEST_COMMON_SRCS}
   LIBS ${SPIRV_TOOLS}
 )
 
 add_spvtools_unittest(TARGET val_data
-	SRCS ${CMAKE_CURRENT_SOURCE_DIR}/Validate.Data.cpp
+	SRCS val_data_test.cpp
        ${VAL_TEST_COMMON_SRCS}
   LIBS ${SPIRV_TOOLS}
 )
diff --git a/test/val/Validate.Capability.cpp b/test/val/val_capability_test.cpp
similarity index 99%
rename from test/val/Validate.Capability.cpp
rename to test/val/val_capability_test.cpp
index 494a553..9e13950 100644
--- a/test/val/Validate.Capability.cpp
+++ b/test/val/val_capability_test.cpp
@@ -14,17 +14,18 @@
 
 // Validation tests for Logical Layout
 
-#include <gmock/gmock.h>
-#include "test_fixture.h"
-#include "unit_spirv.h"
-#include "ValidateFixtures.h"
-#include "source/assembly_grammar.h"
-
 #include <sstream>
 #include <string>
 #include <tuple>
 #include <utility>
 
+#include <gmock/gmock.h>
+
+#include "source/assembly_grammar.h"
+#include "test_fixture.h"
+#include "unit_spirv.h"
+#include "val_fixtures.h"
+
 namespace {
 
 using spvtest::ScopedContext;
diff --git a/test/val/Validate.CFG.cpp b/test/val/val_cfg_test.cpp
similarity index 99%
rename from test/val/Validate.CFG.cpp
rename to test/val/val_cfg_test.cpp
index d0461e3..eb30827 100644
--- a/test/val/Validate.CFG.cpp
+++ b/test/val/val_cfg_test.cpp
@@ -27,7 +27,7 @@
 
 #include "test_fixture.h"
 #include "unit_spirv.h"
-#include "ValidateFixtures.h"
+#include "val_fixtures.h"
 #include "source/diagnostic.h"
 #include "source/validate.h"
 
diff --git a/test/val/Validate.Data.cpp b/test/val/val_data_test.cpp
similarity index 98%
rename from test/val/Validate.Data.cpp
rename to test/val/val_data_test.cpp
index bd19171..b3bfb94 100644
--- a/test/val/Validate.Data.cpp
+++ b/test/val/val_data_test.cpp
@@ -14,14 +14,14 @@
 
 // Validation tests for Data Rules.
 
-#include "unit_spirv.h"
-#include "ValidateFixtures.h"
-#include "gmock/gmock.h"
-
 #include <sstream>
 #include <string>
 #include <utility>
 
+#include "gmock/gmock.h"
+#include "unit_spirv.h"
+#include "val_fixtures.h"
+
 using ::testing::HasSubstr;
 using ::testing::MatchesRegex;
 
diff --git a/test/val/ValidateFixtures.cpp b/test/val/val_fixtures.cpp
similarity index 98%
rename from test/val/ValidateFixtures.cpp
rename to test/val/val_fixtures.cpp
index e10a6a6..3845b30 100644
--- a/test/val/ValidateFixtures.cpp
+++ b/test/val/val_fixtures.cpp
@@ -14,7 +14,7 @@
 
 // Common validation fixtures for unit tests
 
-#include "ValidateFixtures.h"
+#include "val_fixtures.h"
 
 #include <functional>
 #include <tuple>
diff --git a/test/val/ValidateFixtures.h b/test/val/val_fixtures.h
similarity index 100%
rename from test/val/ValidateFixtures.h
rename to test/val/val_fixtures.h
diff --git a/test/val/ValidateID.cpp b/test/val/val_id_test.cpp
similarity index 100%
rename from test/val/ValidateID.cpp
rename to test/val/val_id_test.cpp
diff --git a/test/val/Validate.Layout.cpp b/test/val/val_layout_test.cpp
similarity index 99%
rename from test/val/Validate.Layout.cpp
rename to test/val/val_layout_test.cpp
index 6d5c817..7f92cdb 100644
--- a/test/val/Validate.Layout.cpp
+++ b/test/val/val_layout_test.cpp
@@ -21,9 +21,9 @@
 
 #include "gmock/gmock.h"
 
-#include "unit_spirv.h"
-#include "ValidateFixtures.h"
 #include "source/diagnostic.h"
+#include "unit_spirv.h"
+#include "val_fixtures.h"
 
 using std::function;
 using std::ostream;
diff --git a/test/val/Validate.SSA.cpp b/test/val/val_ssa_test.cpp
similarity index 99%
rename from test/val/Validate.SSA.cpp
rename to test/val/val_ssa_test.cpp
index 2386b15..e954cbf 100644
--- a/test/val/Validate.SSA.cpp
+++ b/test/val/val_ssa_test.cpp
@@ -14,14 +14,14 @@
 
 // Validation tests for SSA
 
-#include "unit_spirv.h"
-#include "ValidateFixtures.h"
-#include "gmock/gmock.h"
-
 #include <sstream>
 #include <string>
 #include <utility>
 
+#include "gmock/gmock.h"
+#include "unit_spirv.h"
+#include "val_fixtures.h"
+
 using ::testing::HasSubstr;
 using ::testing::MatchesRegex;
 
diff --git a/test/val/ValidationState.cpp b/test/val/val_state_test.cpp
similarity index 99%
rename from test/val/ValidationState.cpp
rename to test/val/val_state_test.cpp
index 23df7cc..d6635e0 100644
--- a/test/val/ValidationState.cpp
+++ b/test/val/val_state_test.cpp
@@ -15,8 +15,6 @@
 
 // Unit tests for ValidationState_t.
 
-#include "val/ValidationState.h"
-
 #include <vector>
 
 #include "gtest/gtest.h"
@@ -25,6 +23,7 @@
 #include "enum_set.h"
 #include "val/Construct.h"
 #include "val/Function.h"
+#include "val/ValidationState.h"
 #include "validate.h"
 
 namespace {
diff --git a/test/val/Validate.Storage.cpp b/test/val/val_storage_test.cpp
similarity index 98%
rename from test/val/Validate.Storage.cpp
rename to test/val/val_storage_test.cpp
index 7954eb2..653429f 100644
--- a/test/val/Validate.Storage.cpp
+++ b/test/val/val_storage_test.cpp
@@ -18,8 +18,8 @@
 #include <string>
 #include <tuple>
 
-#include "ValidateFixtures.h"
 #include "gmock/gmock.h"
+#include "val_fixtures.h"
 
 using ValidateStorage = spvtest::ValidateBase<std::string>;