test/ImageTest: Clear back buffer when test cleanup

Many tests don't actually use the back buffer, so uninitialized data is used when capturing leading to failure. Hence, clear the back buffer when the test ends and before swap is called triggering the capture. Bug: angleproject:6035 Change-Id: I0a500ae9f5203feaf0b492dc18e84c5a92ee1497 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2944953Reviewed-by: Cody Northrop <cnorthrop@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Gert Wollny <gert.wollny@collabora.com>

test/ImageTest: Clear back buffer when test cleanup
eb882040 · Gert Wollny · Angle LUCI CQ · d769742c · eb882040
Commit eb882040 authored Jun 08, 2021 by Gert Wollny Committed by Angle LUCI CQ Jun 10, 2021
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ImageTest.cpp src/tests/gl_tests/ImageTest.cpp +2 -0

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--- a/src/tests/gl_tests/ImageTest.cpp
+++ b/src/tests/gl_tests/ImageTest.cpp
@@ -273,6 +273,8 @@ class ImageTest : public ANGLETest
        glDeleteProgram(mTextureProgram);
        glDeleteProgram(mTextureExternalProgram);
        glDeleteProgram(mTextureExternalESSL3Program);
+        glClearColor(0, 0, 0, 0);
+        glClear(GL_COLOR_BUFFER_BIT);
    }
    void createEGLImage2DTextureSource(size_t width,