Looks like in DrawLine we are passing invalid data when AA is enabled and thats why this test is throwing error with Metal API validation.

[I] MTLContext.setColorPaint: pixel=ffffffff [r=255 g=255 b=255 a=255]
[V] MTLRenderQueue_flushBuffer: opcode=20, rem=372
[I] MTLRenderer_FillRect
[I] MTLRenderer_FillRect (x=-35 y=-719 w=766 h=1109), dst tex=0x7fe1f1ef3bf0
[V] MTLRenderQueue_flushBuffer: opcode=10, rem=352
[I] MTLRenderer_DrawLine (x1=61 y1=13 x2=61 y2=13), dst tex=0x7fe1f1ef3bf0
[V] MTLLayer_displayLinkCallback() called
----------System.err:(26/2178)----------
2021-02-17 16:16:43.743 java[4703:3573344] Metal API Validation Enabled
2021-02-17 16:16:44.172 system_profiler[4705:3573439] Metal API Validation Enabled
2021-02-17 16:16:45.635 java[4703:3573379] name is : .SFNS-Regular
2021-02-17 16:16:45.635 java[4703:3573379] family is : .AppleSystemUIFont
2021-02-17 16:16:45.635 java[4703:3573379] name is : .SFNS-Bold
2021-02-17 16:16:45.635 java[4703:3573379] family is : .AppleSystemUIFont
2021-02-17 16:16:46.027 java[4703:3573379] nsFont-name is : .AppleSystemUIFont
2021-02-17 16:16:46.027 java[4703:3573379] nsFont-family is : .AppleSystemUIFont
2021-02-17 16:16:46.027 java[4703:3573379] nsFont-desc-name is : .SFNS-Regular
2021-02-17 16:16:46.027 java[4703:3573379] nsFont-name is : .AppleSystemUIFont
2021-02-17 16:16:46.027 java[4703:3573379] nsFont-family is : .AppleSystemUIFontBold
2021-02-17 16:16:46.027 java[4703:3573379] nsFont-desc-name is : .SFNS-Bold
2021-02-17 16:16:46.034 java[4703:3573379] nsFont-name is : .AppleSystemUIFont
2021-02-17 16:16:46.034 java[4703:3573379] nsFont-family is : .AppleSystemUIFont
2021-02-17 16:16:46.034 java[4703:3573379] nsFont-desc-name is : .SFNS-Regular
2021-02-17 16:16:46.047 java[4703:3573379] nsFont-name is : .AppleSystemUIFont
2021-02-17 16:16:46.047 java[4703:3573379] nsFont-family is : .AppleSystemUIFontBold
2021-02-17 16:16:46.047 java[4703:3573379] nsFont-desc-name is : .SFNS-Bold
2021-02-17 16:16:46.205 java[4703:3573344] became key: 0 JEditorPane Demo (null)
2021-02-17 16:16:46.211 java[4703:3573344] became main: 1 JEditorPane Demo (null) 1
2021-02-17 16:17:09.182 java[4703:3573344] resigned main: 1 JEditorPane Demo (null)
2021-02-17 16:17:09.183 java[4703:3573344] resigned key: 0 JEditorPane Demo (null)
2021-02-17 16:17:09.183 java[4703:3573344] deactivating window: JEditorPane Demo
2021-02-17 16:17:09.927 java[4703:3573344] became key: 0 JEditorPane Demo (null)
2021-02-17 16:17:09.928 java[4703:3573344] became main: 1 JEditorPane Demo (null) 1
validateFunctionArguments:3485: failed assertion `Vertex Function(vert_col_aa): argument vertexBuffer.0[0] from buffer(0) with offset(0) and length(16) has space for 16 bytes, but argument has a length(24).'