skip inferred test for old Julia version

test/structuring_element.jl

@@ -21,41 +21,65 @@
         @test se_mask == Bool[0 0 0; 0 0 0; 0 1 0; 1 1 1; 1 1 1]
 
         se = @inferred strel(Bool, CartesianIndex{2}[])
-        @test se == Bool[1;;]
+        @test se == reshape(Bool[1], (1, 1)) # v1.7: Bool[1;;]
 
         # invalid cases
         se = [CartesianIndex(1), CartesianIndex(1, 1)]
-        @test_throws MethodError strel(se)
+        @test_throws ErrorException strel(se)
     end
 
     @testset "mask to offset" begin
         se = Bool[1, 0, 1]
-        se_offsets = @inferred strel(CartesianIndex, se)
+        se_offsets = if VERSION >= v"1.6"
+            @inferred strel(CartesianIndex, se)
+        else
+            strel(CartesianIndex, se)
+        end
         @test se_offsets == [CartesianIndex(-1,), CartesianIndex(1,)]
         @test se_offsets == strel(CartesianIndex, Bool[1, 1, 1])
 
         se = Bool[1 0 0; 0 1 0; 0 0 1]
-        se_offsets = @inferred strel(CartesianIndex, se)
+        se_offsets = if VERSION >= v"1.6"
+            @inferred strel(CartesianIndex, se)
+        else
+            strel(CartesianIndex, se)
+        end
         @test se_offsets == [CartesianIndex(-1, -1), CartesianIndex(1, 1)]
         # internally, CartesianIndex is converted to SEOffsets
-        se_offsets = @inferred strel(ImageMorphology.SEOffsets{2}(), se)
+        se_offsets = if VERSION >= v"1.6"
+            @inferred strel(ImageMorphology.SEOffsets{2}(), se)
+        else
+            strel(ImageMorphology.SEOffsets{2}(), se)
+        end
         @test se_offsets == [CartesianIndex(-1, -1), CartesianIndex(1, 1)]
 
         se = trues((3, 3))
-        se_offsets = @inferred strel(CartesianIndex, se)
+        se_offsets = if VERSION >= v"1.6"
+            @inferred strel(CartesianIndex, se)
+        else
+            strel(CartesianIndex, se)
+        end
         @test se_offsets == filter(x -> !iszero(x), vec(CartesianIndices((-1:1, -1:1))))
 
-        se = @inferred strel(CartesianIndex, falses(3, 3))
+        se = if VERSION >= v"1.6"
+            @inferred strel(CartesianIndex, falses(3, 3))
+        else
+            strel(CartesianIndex, falses(3, 3))
+        end
         @test isempty(se)
     end
 
     @testset "center point" begin
         for se in [Bool[1 0 0; 0 1 0; 0 0 1], Bool[1 0 0; 0 0 0; 0 0 1]]
             # center point is always excluded in offsets
-            se_offset = @inferred strel(CartesianIndex, se)
-            @test se_offset == [CartesianIndex(-1, -1), CartesianIndex(1, 1)]
+            se_offsets = if VERSION >= v"1.6"
+                @inferred strel(CartesianIndex, se)
+            else
+                strel(CartesianIndex, se)
+            end
+            @test se_offsets == [CartesianIndex(-1, -1), CartesianIndex(1, 1)]
             # but included in mask
-            se_mask = @inferred strel(Bool, se_offset)
+            se_mask = @inferred strel(Bool, se_offsets)
             @test se_mask == Bool[1 0 0; 0 1 0; 0 0 1]
         end
     end
@@ -113,7 +137,11 @@ end
 
     @testset "strel conversion" begin
         se = strel_diamond((3, 3))
-        se_offsets = @inferred strel(CartesianIndex, se)
+        se_offsets = if VERSION >= v"1.6"
+            @inferred strel(CartesianIndex, se)
+        else
+            strel(CartesianIndex, se)
+        end
         @test se_offsets == [CartesianIndex(0, -1), CartesianIndex(-1, 0), CartesianIndex(1, 0), CartesianIndex(0, 1)]
         se_mask = @inferred strel(Bool, se)
         # not BitMatrix as SEDiamondArray provides more information of what the SE is
@@ -185,7 +213,11 @@ end
 
     @testset "strel conversion" begin
         se = strel_window((3, 3))
-        se_offsets = @inferred strel(CartesianIndex, se)
+        se_offsets = if VERSION >= v"1.6"
+            @inferred strel(CartesianIndex, se)
+        else
+            strel(CartesianIndex, se)
+        end
         @test se_offsets == filter(i->!iszero(i), vec(CartesianIndices((-1:1, -1:1))))
         se_mask = @inferred strel(Bool, se)
         # not BitMatrix as SEWindowArray provides more information of what the SE is
@@ -212,7 +244,7 @@ end
     @test strel_type(CartesianIndices((-1:1, -1:1))) isa ImageMorphology.SEOffsets
     @test strel_type(trues(3, 3)) isa ImageMorphology.SEMask
 
-    msg = "invalid structuring element data type: Vector{CartesianIndex}"
+    msg = "invalid structuring element data type: $(Vector{CartesianIndex})"
     @test_throws ErrorException(msg) strel_type(CartesianIndex[])
 end