fix tests

test/dsp.jl

@@ -81,7 +81,7 @@ end
             v_off = OffsetVector(v, -42)
             @test conv(u, v; algorithm=:direct) ≈ conv(u, v; algorithm=:fft_simple) ≈ conv(u, v; algorithm=:fft_overlapsave)
             @test conv(u_off, v_off; algorithm=:direct) ≈ conv(u_off, v_off; algorithm=:fft_simple) ≈ conv(u_off, v_off; algorithm=:fft_overlapsave)
-            @test conv(u, v) == conv(u_off, v_off)[23-42+2:23-42+N+M]
+            @test conv(u, v) ≈ conv(u_off, v_off)[23-42+2:23-42+N+M]
 
             for algorithm in [:direct, :fft_simple, :fft_overlapsave]
                 # pre-allocated non-offset output larger than necessary
@@ -93,7 +93,7 @@ end
                 # pre-allocated output with offset larger than necessary
                 out = OffsetVector(ones(T, M+N+10), 23-42-5)
                 conv!(out, u_off, v_off; algorithm)
-                @test out[23-42+2:23-42+N+M] == conv(u, v; algorithm)
+                @test out[23-42+2:23-42+N+M] ≈ conv(u, v; algorithm)
                 @test all(iszero, out[begin:23-42+1])
                 @test all(iszero, out[23-42+N+M+1:end])
             end